{"id":3577,"date":"2024-05-29T05:33:01","date_gmt":"2024-05-29T05:33:01","guid":{"rendered":"https:\/\/broachingmach.com\/?p=3577"},"modified":"2026-10-28T11:12:43","modified_gmt":"2026-10-28T03:12:43","slug":"what-is-broach-holder","status":"publish","type":"post","link":"https:\/\/broachingmach.com\/en_gb\/what-is-broach-holder\/","title":{"rendered":"What Is Broach Holder &amp; Its Uses?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">A broach holder is the machine-side coupling that joins a broach to the broaching machine. It retains the cutting tool through the stroke, transfers the pull or push load into the machine, and sets the broach&#39;s alignment relative to the workpiece. This guide explains what a broach holder does, how it differs from the workholding fixture it is so often confused with, the main holder families for pull, surface, push and rotary broaching, and how to select, install and verify one.<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_89 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<div class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/div>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/broachingmach.com\/en_gb\/what-is-broach-holder\/#Table_of_Contents\" >Table of Contents<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/broachingmach.com\/en_gb\/what-is-broach-holder\/#What_Is_a_Broach_Holder\" >What Is a Broach Holder?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/broachingmach.com\/en_gb\/what-is-broach-holder\/#Broach_Holder_vs_Broaching_Fixture\" >Broach Holder vs. Broaching Fixture<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/broachingmach.com\/en_gb\/what-is-broach-holder\/#Pull_Ends_and_the_Broach_Puller\" >Pull Ends and the Broach Puller<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/broachingmach.com\/en_gb\/what-is-broach-holder\/#Holders_for_Surface_and_Push_Broaching\" >Holders for Surface and Push Broaching<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/broachingmach.com\/en_gb\/what-is-broach-holder\/#The_Rotary_Broach_Holder\" >The Rotary Broach Holder<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/broachingmach.com\/en_gb\/what-is-broach-holder\/#Alignment_Rigidity_and_Verification\" >Alignment, Rigidity and Verification<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/broachingmach.com\/en_gb\/what-is-broach-holder\/#How_to_Select_a_Broach_Holder\" >How to Select a Broach Holder<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/broachingmach.com\/en_gb\/what-is-broach-holder\/#Installing_a_Broach_Holder_and_Proving_the_Setup\" >Installing a Broach Holder and Proving the Setup<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/broachingmach.com\/en_gb\/what-is-broach-holder\/#Troubleshooting_Broach_Holder_Problems\" >Troubleshooting Broach Holder Problems<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/broachingmach.com\/en_gb\/what-is-broach-holder\/#Frequently_Asked_Questions\" >Frequently Asked Questions<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/broachingmach.com\/en_gb\/what-is-broach-holder\/#Can_one_broach_holder_fit_several_broach_sizes\" >Can one broach holder fit several broach sizes?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/broachingmach.com\/en_gb\/what-is-broach-holder\/#Does_the_holder_choice_affect_hole_accuracy\" >Does the holder choice affect hole accuracy?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/broachingmach.com\/en_gb\/what-is-broach-holder\/#Talk_to_Us_About_Holders_and_Fixtures\" >Talk to Us About Holders and Fixtures<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/broachingmach.com\/en_gb\/what-is-broach-holder\/#References\" >References<\/a><\/li><\/ul><\/nav><\/div>\n\n\n\n\n<h2 class=\"wp-block-heading\" id=\"table-of-contents\"><span class=\"ez-toc-section\" id=\"Table_of_Contents\"><\/span>Table of Contents<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"#what-is-a-broach-holder\">What Is a Broach Holder?<\/a><\/li><li><a href=\"#broach-holder-vs-broaching-fixture\">Broach Holder vs. Broaching Fixture<\/a><\/li><li><a href=\"#pull-ends-and-the-broach-puller\">Pull Ends and the Broach Puller<\/a><\/li><li><a href=\"#holders-for-surface-and-push-broaching\">Holders for Surface and Push Broaching<\/a><\/li><li><a href=\"#the-rotary-broach-holder\">The Rotary Broach Holder<\/a><\/li><li><a href=\"#alignment-rigidity-and-verification\">Alignment, Rigidity and Verification<\/a><\/li><li><a href=\"#how-to-select-a-broach-holder\">How to Select a Broach Holder<\/a><\/li><li><a href=\"#installing-a-broach-holder-and-proving-the-setup\">Installing a Broach Holder and Proving the Setup<\/a><\/li><li><a href=\"#troubleshooting-broach-holder-problems\">Troubleshooting Broach Holder Problems<\/a><\/li><li><a href=\"#frequently-asked-questions\">Frequently Asked Questions<\/a><\/li><li><a href=\"#talk-to-us-about-holders-and-fixtures\">Talk to Us About Holders and Fixtures<\/a><\/li><li><a href=\"#references\">References<\/a><\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what-is-a-broach-holder\"><span class=\"ez-toc-section\" id=\"What_Is_a_Broach_Holder\"><\/span>What Is a Broach Holder?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Broaching removes material with a long, multi-toothed cutter &mdash; the broach &mdash; that is pulled or pushed through, or past, the workpiece in a single stroke; if the process itself is new to you, start with our overview of <a href=\"https:\/\/broachingmach.com\/en_gb\/what-is-broaching\/\">what broaching is<\/a>. The broach holder is the interface at the other end of that cutter: the connection between tool and machine. In <em>Cutting Tool Applications<\/em>, George Schneider describes the sequence for internal work: &quot;the pull end and front pilot are passed through the starting hole. Then the pull end is locked to the pull head of the broaching machine.&quot; The holder, the pull head it seats in, the broach and the workholding all form one load path.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That makes the holder a precision, load-carrying component rather than a passive bracket. The machining handbook section by Serope Kalpakjian lists the attachment options: &quot;Pull broaches are attached to the crosshead of the broaching machine by means of a key slot and key, by a threaded connection, or by a head that fits into an automatic broach puller.&quot; Whichever interface a machine uses, the holder has three jobs: retain the broach against axial cutting and return loads, transmit those loads without loosening, and control the tool&#39;s position and orientation during the cut.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/broachingmach.com\/wp-content\/uploads\/2024\/05\/\u9009\u62e9\u62c9\u5200\u5939\u5934.png\" alt=\"Rendered illustration of precision machined components and tooling used in broaching setups\" class=\"wp-image-5139\" title=\"\" srcset=\"https:\/\/broachingmach.com\/wp-content\/uploads\/2024\/05\/\u9009\u62e9\u62c9\u5200\u5939\u5934.png 1024w, https:\/\/broachingmach.com\/wp-content\/uploads\/2024\/05\/\u9009\u62e9\u62c9\u5200\u5939\u5934-300x188.png 300w, https:\/\/broachingmach.com\/wp-content\/uploads\/2024\/05\/\u9009\u62e9\u62c9\u5200\u5939\u5934-768x480.png 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Broach holders are precision, load-carrying couplings between the broach and the machine (rendered illustration).<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The uses follow from the process. Holders carry the keyway broaches that cut <a href=\"https:\/\/broachingmach.com\/en_gb\/keyway-broaching-the-complete-guide\/\">keyways in bores<\/a>, the spline broaches that form <a href=\"https:\/\/broachingmach.com\/en_gb\/involute-spline-broaching-guide\/\">involute splines in gear hubs<\/a>, and the polygon broaches that produce square and hexagon holes &mdash; each in a single pass, which is exactly why the tool-to-machine connection has to hold its position under full cutting load.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p class=\"wp-block-paragraph\"><strong>Key takeaways<\/strong><\/p>\n<ul class=\"wp-block-list\"><li>A broach holder couples the broach to the machine and carries the cutting and return loads; the broaching fixture locates and clamps the workpiece on the other side.<\/li><li>Internal pull broaches attach by a key slot and key, a threaded connection or an automatic puller head; surface broaches are built up in holders or sub holders on the machine slide.<\/li><li>Rotary broach holders cut polygon forms with a 1-degree offset on lathes, mills and machining centers.<\/li><\/ul>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"broach-holder-vs-broaching-fixture\"><span class=\"ez-toc-section\" id=\"Broach_Holder_vs_Broaching_Fixture\"><\/span>Broach Holder vs. Broaching Fixture<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The two terms are routinely swapped, but they name parts on opposite sides of the cut. The broach holder is on the tool side: it connects the broach to the machine&#39;s crosshead, drawhead or slide. The broaching fixture is on the workpiece side: it locates and holds the part while the broach passes through. A 2023 bachelor thesis by Klingst&#229;hl and Poucette at the University of Sk&#246;vde, which studied the production fixture for broaching truck companion flanges, states the pair of definitions plainly: &quot;The two most important factors when designing a fixture is: locating and clamping. Locating is the orientation of the workpiece with regards to the cutting tool. Clamping is the holding of the workpiece during cutting operations.&quot;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fixture design is its own discipline. The same thesis records the classical requirement that &quot;the fixture must hold the workpiece in a specific location and halt 12 degrees of freedom,&quot; and notes that in a rectangular part, &quot;direction one to nine is restricted by six locator pins,&quot; with the last three held by the clamping device. On the flange line the authors studied, the fixture is hydraulically actuated: &quot;the guiding pin guides the companion into position, the collet expands and center the flange and lastly the upper and lower supports are moved into contact with the flange.&quot; After one pull of broaching, &quot;the companion flange rotates 70&#176; to create the second set of splines by another pull of broaching&quot; &mdash; indexing that belongs to the fixture, not to the tool holder.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For the workpiece side of the problem &mdash; locating schemes, clamping forces and fixture stiffness &mdash; see our dedicated <a href=\"https:\/\/broachingmach.com\/en_gb\/broaching-fixture-design-guide\/\">broaching fixture design guide<\/a>. This article stays on the tool side: how the holder grips the broach and keeps it true.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"pull-ends-and-the-broach-puller\"><span class=\"ez-toc-section\" id=\"Pull_Ends_and_the_Broach_Puller\"><\/span>Pull Ends and the Broach Puller<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Most internal broaching is pull broaching, and the holder system starts at the broach itself. Beyond its cutting teeth, a pull broach carries a pull end and pilots. The front pilot does quiet but important work before any tooth engages: as Schneider notes, it &quot;assures correct axial alignment of the tool with the starting hole, and serves as a check on the starting hole size.&quot;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">How the pull end meets the machine decides how the line runs. Kalpakjian&#39;s three attachment methods suit different duty cycles. The threaded connection fits keyway work where the broach can stay coupled between parts: &quot;the threaded connection is used where the broach is not removed from the drawing head while the workpiece is placed over the cutter, as in cutting a keyway.&quot; Hole-enlarging work is the opposite case &mdash; &quot;the small end of the pull broach must first be extended through the reamed, drilled, or cored hole and then fixed in the drawing head before being pulled through the workpiece&quot; &mdash; which favors quick-acting automatic puller heads that grip a plain or notched pull end as the ram approaches.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The engineering book <em>Broaches and Broaching<\/em> (Ethan Viall, 1918) devotes a chapter to &quot;broach holders or couplings,&quot; and its basics still apply. The simplest coupling is &quot;a sleeve into which the end of the broach shank is slipped and fastened by means of a cotter pin run down through slots in the sleeve and broach end.&quot; Threaded adapters brought standardization: one drawhead sleeve could serve many broaches, because &quot;the shanks of these broaches all being threaded alike.&quot; But Viall warns that a screwed adapter &quot;should have some means of locking or clamping it securely to the thread to prevent any tendency to loosen or twist as the broach is pulled through the work&quot; &mdash; a failure mode that has not changed in a century. Even spiral keyways were a holder problem: cutting them &quot;necessitates the use of a revolving broach holder as well as a master broach guide,&quot; so the tool can rotate with the helix as it is drawn through.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"holders-for-surface-and-push-broaching\"><span class=\"ez-toc-section\" id=\"Holders_for_Surface_and_Push_Broaching\"><\/span>Holders for Surface and Push Broaching<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Surface broaching inverts the picture: the tool is long and built-up rather than slim and solid. As Schneider describes external broaches, &quot;most are of built-up design, with sections, inserts or indexable tool bits that are assembled end-to-end in a broach holder or sub holder. The holder fits on the machine slide and provides rigid alignment and support.&quot; Here the holder is effectively a long carrier bolted to the slide, and its stiffness under distributed cutting load &mdash; not just its retention at one end &mdash; is the design driver.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Internal keyway work adds a guidance element on the workpiece side: the horn. &quot;Internal keyways usually require a slotted bushing or horn to fit the hole, with the keyway broach pulled through the horn, guided by the slot,&quot; Schneider writes, so the broach is positioned by the fixture&#39;s bushing while it is pulled by the machine&#39;s holder &mdash; tool side and work side working in pairs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Push broaching is the third family, and it changes what the &quot;holder&quot; has to be. Kalpakjian notes that &quot;push broaching is done on machines of the press type with a sort of fixture for holding the workpiece and broach&quot; &mdash; often an arbor press or a <a href=\"https:\/\/broachingmach.com\/en_gb\/broaching-press-guide\/\">broaching press<\/a> rather than a pull machine. Because the tool works in compression, Schneider&#39;s rule is blunt: &quot;a push broach must be relatively short since it is a column in compression and will buckle and break under too heavy a load.&quot; Kalpakjian quantifies the consequence &mdash; &quot;push broaches are usually shorter than pull broaches, being 6 to 14 in (150 to 350 mm) long&quot; &mdash; and notes that &quot;four to six broaches of the push type constitute a set used in sequence to finish the surface being broached.&quot; The holder on a press usually supports the broach tail as well as its head, since there is no drawhead to carry the tool.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pull and push also differ in what they do to the hole. &quot;With pull broaches, pulling tends to straighten the hole, whereas pushing permits the broaches to follow any irregularity of the leader hole,&quot; Kalpakjian observes &mdash; one more reason the choice of holder system is a process decision, not an accessory decision.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"the-rotary-broach-holder\"><span class=\"ez-toc-section\" id=\"The_Rotary_Broach_Holder\"><\/span>The Rotary Broach Holder<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Rotary broaching &mdash; Polygon Solutions describes the method as one that &quot;has been around for over 100 years&quot; &mdash; puts the holder at the center of the mechanism. &quot;The holder is offset 1 degree from the centerline of the shank allowing the broach to enter the part at an angle, only cutting one portion of the form at a time,&quot; the toolmaker explains; the wobbling broach shear-cuts a hexagon, square or spline form in one pass. Because the holder does the work, &quot;the rotary broaching operation can be performed in any CNC or Manual lathe, mill, screw machine, VMC or turning center&quot; &mdash; no broaching machine required.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Selection here is a size-matching exercise. Polygon&#39;s own holder families are graded by the forms they carry: the Swiss-type Micro holder for smaller forms from .030&quot; to .250&quot;, the GT 8 mm series for .050&quot; to .315&quot;, the GT &#189;&quot; series for .081&quot; to .630&quot;, and the HT heavy-duty &#190;&quot; series for larger forms from .500&quot; to 2.50&quot;. For the wider picture of the process and its tooling, see <a href=\"https:\/\/broachingmach.com\/en_gb\/what-is-rotary-broaching\/\">what rotary broaching is<\/a> and our guide to <a href=\"https:\/\/broachingmach.com\/en_gb\/rotary-broaching-tools-and-holders\/\">rotary broaching tools and holders<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"alignment-rigidity-and-verification\"><span class=\"ez-toc-section\" id=\"Alignment_Rigidity_and_Verification\"><\/span>Alignment, Rigidity and Verification<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A holder that grips firmly but sits crooked produces scrap just as reliably as one that slips. Alignment between the tool path and the fixture has been checked the same way for a century: Viall&#39;s shop practice was that &quot;the broach holder in the machine is set true with the holes in the jig by means of a test bar, and the work is brought into alignment by the plain guide on the broach.&quot; The modern equivalent &mdash; indicating the holder seat and fixture datum with the broach or a mandrel as the reference &mdash; is the same load-path thinking.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Accuracy limits also trace back to how the broach is held and guided. Kalpakjian cautions that &quot;the broach may be guided only by the workpiece it is cutting,&quot; so &quot;the hole may not be accurate with respect to previously machined surfaces&quot;; where that relationship matters, &quot;it is better practice to broach first and then turn other surfaces with the workpiece mounted on a mandrel.&quot; The broached feature sets the datum, and everything else is machined to it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Stiffness in the chain shows up directly in tolerance. In the Sk&#246;vde study, finite-element simulation of the companion-flange setup found that &quot;simulations suggests that the new fixture with some changes improves dimensional errors that occurred in the current fixture,&quot; and the authors flag the rest of the chain for the same treatment: &quot;further work to reduce dimensional errors could be to investigate the effects of displacements in the broach, broach holder and guidelines.&quot; Wear travels the same path &mdash; the plant suffered &quot;errors in dimensional tolerance of the companion flange when wear in the broach starts to occur,&quot; and &quot;a result of dimensional errors is that the parts are discarded.&quot; Holder and fixture components are built accordingly: the thesis fixture&#39;s supporting parts are made of SS-2260, &quot;also called AISI type A2 tool steel that is hardened and tempered to an interval of 58 \u2013 60 HRC,&quot; hardened &quot;for two hours in an oven at a temperature of 960&#176;C and tempered twice at 250&#176;C&quot; to hold their geometry under repeated broaching loads.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"how-to-select-a-broach-holder\"><span class=\"ez-toc-section\" id=\"How_to_Select_a_Broach_Holder\"><\/span>How to Select a Broach Holder<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Selection is best done as a load-path review rather than a catalog lookup:<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li><strong>Match the machine interface.<\/strong> Crosshead key slot, threaded drawhead, automatic puller head, press arbor or machine-slide carrier &mdash; the holder must fit the connection the machine actually has, including its retention method and allowable axial and radial load.<\/li><li><strong>Match the tool interface.<\/strong> Pull-end form, shank diameter, thread, notch or flat must match the broaches you run; where broaches are mixed, a standardized shank with one adapter, on Viall&#39;s principle, keeps changeover short.<\/li><li><strong>Check load direction and capacity.<\/strong> Pull, push and return loads differ; a push setup must respect the compression-column limit that keeps push broaches short, while pull holders must carry full draw force without slipping.<\/li><li><strong>Decide how retention is verified.<\/strong> A holder whose grip you cannot check &mdash; torque value, actuation signal, witness mark &mdash; cannot be trusted on an unmanned cycle.<\/li><li><strong>Plan orientation control.<\/strong> Keyways and splines need clocked angular position; horns, master guides or an alignment brake provide it. Spiral work needs the revolving holder with its master guide.<\/li><li><strong>Limit overhang and adapter stacks.<\/strong> Every adapter adds deflection under load; the stiffest holder is the shortest chain from machine to pull end.<\/li><li><strong>Size rotary holders to the form.<\/strong> Match the holder series to the form range you actually cut, per the toolmaker&#39;s size grades, and confirm the shank size matches the broach.<\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">If the decision is tangled up with the machine itself, our guide on <a href=\"https:\/\/broachingmach.com\/en_gb\/how-to-choose-the-right-broaching-machine\/\">how to choose the right broaching machine<\/a> works through tonnage, stroke and configuration from the part upward.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"installing-a-broach-holder-and-proving-the-setup\"><span class=\"ez-toc-section\" id=\"Installing_a_Broach_Holder_and_Proving_the_Setup\"><\/span>Installing a Broach Holder and Proving the Setup<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Installation is a short, disciplined sequence:<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>Lock out the machine and support heavy tooling properly before touching the interface.<\/li><li>Clean and inspect every seating surface &mdash; holder seat, pull end, adapter threads, horn bore. Never clamp or seat across chips, burrs or dinged edges.<\/li><li>Confirm holder and broach identifiers against the setup sheet and current drawing revision.<\/li><li>Seat and retain the tool by the specified method, applying the specified torque or actuation check. Do not improvise spacers or extensions.<\/li><li>Verify alignment at the defined reference &mdash; indicate the holder, or use the test-bar practice &mdash; and confirm clearance for the full stroke, including the retriever.<\/li><li>Run the first part at the validated condition while watching load, sound and motion; stop if seating, alignment or return behavior changes.<\/li><li>Inspect the first-off part against the drawing, and recheck the interface after the initial cycles, since a new coupling most often reveals its problems early.<\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">The point of the sequence is that holder condition is a process input: recorded, checked and re-checked, not assumed.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"troubleshooting-broach-holder-problems\"><span class=\"ez-toc-section\" id=\"Troubleshooting_Broach_Holder_Problems\"><\/span>Troubleshooting Broach Holder Problems<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Frequent loosening, fretting at the mating surfaces, runout drift, witness marks or uneven tooth wear are system symptoms, not a signal to tighten harder. Work down the load path before returning the holder to production: mating surfaces and threads, the adapter stack, the horn or guide, the fixture seating and the machine motion. A threaded adapter that loosens in service is failing Viall&#39;s century-old locking rule and needs its lock repaired or replaced, not more torque.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dimensional drift points the same direction. The Sk&#246;vde study ties scrap on the flange line to broach wear amplified through the workholding chain, and treats broach, broach holder and guides as one displacement system to be analyzed together. Our <a href=\"https:\/\/broachingmach.com\/en_gb\/troubleshooting-for-broaching-operation\/\">broaching troubleshooting guide<\/a> covers the cutting-side symptoms that often surface first.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"frequently-asked-questions\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"can-one-broach-holder-fit-several-broach-sizes\"><span class=\"ez-toc-section\" id=\"Can_one_broach_holder_fit_several_broach_sizes\"><\/span>Can one broach holder fit several broach sizes?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Often, yes &mdash; that is what threaded adapters were designed for. Viall describes the economy directly: one adapter serves &quot;a number of sizes of broaches, the shanks of these broaches all being threaded alike.&quot; The checks are load capacity and pull-end condition on each broach; the convenience never overrides them.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"does-the-holder-choice-affect-hole-accuracy\"><span class=\"ez-toc-section\" id=\"Does_the_holder_choice_affect_hole_accuracy\"><\/span>Does the holder choice affect hole accuracy?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">It contributes to it, together with guidance. Pulling through good locating tends to straighten a hole, while pushing lets the broach follow the leader hole&#39;s irregularities, as Kalpakjian distinguishes; and because the broach is largely guided by the workpiece it cuts, the broached hole sets the datum for later operations rather than the reverse.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"talk-to-us-about-holders-and-fixtures\"><span class=\"ez-toc-section\" id=\"Talk_to_Us_About_Holders_and_Fixtures\"><\/span>Talk to Us About Holders and Fixtures<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Broach holders decide whether an expensive broach cuts true or scrapes by, and the fixture on the other side of the cut carries equal weight. We design and build <a href=\"https:\/\/broachingmach.com\/en_gb\/services\/fixtures-design-and-build\/\">broaching fixtures<\/a> to match part, broach and machine as one system. <a href=\"https:\/\/broachingmach.com\/en_gb\/contact\/\">Contact our engineering team<\/a> with your part drawing and volumes, and we will review the whole tool path &mdash; broach, holder and fixture &mdash; with you.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"references\"><span class=\"ez-toc-section\" id=\"References\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li><em><a href=\"https:\/\/people.iut.ac.ir\/sites\/default\/files\/users\/mosafavi\/course_files\/machining_processes_1.pdf\" target=\"_blank\" rel=\"noopener\">Machining Processes and Machine Tools, Sec. 13.4 (by Serope Kalpakjian)<\/a> &mdash; Kalpakjian; how pull broaches attach to the machine crosshead, threaded versus puller connections, push broach lengths and set sizes, press-type push broaching, and the hole-accuracy limits of a self-guided broach.<\/em><\/li><li><em><a href=\"https:\/\/www.americanmachinist.com\/cutting-tools\/media-gallery\/21135347\/chapter-14-broaches-and-broaching-cutting-tool-applications\" target=\"_blank\" rel=\"noopener\">Cutting Tool Applications, Chapter 14: Broaches and Broaching<\/a> &mdash; Schneider; the pull end and front pilot, locking the pull end to the pull head, surface broach holders and sub holders on the machine slide, keyway horns, and push-broach buckling.<\/em><\/li><li><em><a href=\"https:\/\/ia801608.us.archive.org\/15\/items\/broachesbroachin00vialuoft\/broachesbroachin00vialuoft.pdf\" target=\"_blank\" rel=\"noopener\">Broaches and Broaching (Ethan Viall, McGraw-Hill, 1918)<\/a> &mdash; Viall; the broach holders or couplings chapter: cotter-pin sleeves, threaded adapters and their locking, revolving holders for spiral keyways, and test-bar alignment practice.<\/em><\/li><li><em><a href=\"https:\/\/www.diva-portal.org\/smash\/get\/diva2:1770721\/FULLTEXT01.pdf\" target=\"_blank\" rel=\"noopener\">Development and analysis of fixture for broaching of companion flange (bachelor thesis, University of Sk&#246;vde, 2023)<\/a> &mdash; Klingst&#229;hl and Poucette; fixture locating and clamping, halting 12 degrees of freedom, the hydraulic companion-flange fixture with 70-degree indexing, A2 tool-steel supports at 58\u201360 HRC, and FEM results linking fixture stiffness to dimensional errors.<\/em><\/li><li><em><a href=\"https:\/\/polygonsolutions.com\/rotary-broaching\/\" target=\"_blank\" rel=\"noopener\">Rotary Broaching FAQs<\/a> &mdash; Polygon Solutions; the 1-degree holder offset, the machines that can run rotary broaching, and tool holder series matched to form sizes.<\/em><\/li><\/ul>","protected":false},"excerpt":{"rendered":"<p>A broach holder is the machine-side coupling that joins a broach to the broaching machine. It retains the cutting tool [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":9430,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[23,34],"tags":[],"class_list":["post-3577","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-broaching","category-broaching-tools"],"_links":{"self":[{"href":"https:\/\/broachingmach.com\/en_gb\/wp-json\/wp\/v2\/posts\/3577","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/broachingmach.com\/en_gb\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/broachingmach.com\/en_gb\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/broachingmach.com\/en_gb\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/broachingmach.com\/en_gb\/wp-json\/wp\/v2\/comments?post=3577"}],"version-history":[{"count":15,"href":"https:\/\/broachingmach.com\/en_gb\/wp-json\/wp\/v2\/posts\/3577\/revisions"}],"predecessor-version":[{"id":9432,"href":"https:\/\/broachingmach.com\/en_gb\/wp-json\/wp\/v2\/posts\/3577\/revisions\/9432"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/broachingmach.com\/en_gb\/wp-json\/wp\/v2\/media\/9430"}],"wp:attachment":[{"href":"https:\/\/broachingmach.com\/en_gb\/wp-json\/wp\/v2\/media?parent=3577"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/broachingmach.com\/en_gb\/wp-json\/wp\/v2\/categories?post=3577"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/broachingmach.com\/en_gb\/wp-json\/wp\/v2\/tags?post=3577"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}