{"id":9248,"date":"2026-08-20T14:30:48","date_gmt":"2026-08-20T06:30:48","guid":{"rendered":"https:\/\/broachingmach.com\/?p=9248"},"modified":"2026-08-20T14:30:48","modified_gmt":"2026-08-20T06:30:48","slug":"gear-shift-fork-broaching","status":"publish","type":"post","link":"http:\/\/broachingmach.com\/ja\/gear-shift-fork-broaching\/","title":{"rendered":"Gear Shift Fork Broaching: Grooves, Slots and Tolerances in Transmission Parts"},"content":{"rendered":"<figure class=\"wp-block-image\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/broachingmach.com\/wp-content\/uploads\/2026\/08\/5-gear-shift-fork-broaching-tech.png\" alt=\"Shift fork machined features: bore keyway and fork prongs\" class=\"wp-image-9237\" srcset=\"http:\/\/broachingmach.com\/wp-content\/uploads\/2026\/08\/5-gear-shift-fork-broaching-tech.png 1536w, http:\/\/broachingmach.com\/wp-content\/uploads\/2026\/08\/5-gear-shift-fork-broaching-tech-300x200.png 300w, http:\/\/broachingmach.com\/wp-content\/uploads\/2026\/08\/5-gear-shift-fork-broaching-tech-1024x683.png 1024w, http:\/\/broachingmach.com\/wp-content\/uploads\/2026\/08\/5-gear-shift-fork-broaching-tech-768x512.png 768w, http:\/\/broachingmach.com\/wp-content\/uploads\/2026\/08\/5-gear-shift-fork-broaching-tech-18x12.png 18w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/figure>\n\n\n<p>Inside every manual and dual-clutch gearbox, gear selection is mechanical work. Motion travels from the shifter through the selector mechanism to the shift rails, and at the end of that chain a shift fork converts axial travel into movement of the synchronizer sleeve. The fork&#8217;s fingers ride in an annular groove on the outside of the sleeve, so every shift is, quite literally, the fork pushing the sleeve into mesh. How cleanly that happens \u2014 and how long the synchronizer assembly lasts \u2014 depends on how accurately the fork is machined.<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 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\">\u76ee\u6b21<\/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=\"\u30c8\u30b0\u30eb\u76ee\u6b21\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">\u30c8\u30b0\u30eb<\/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=\"http:\/\/broachingmach.com\/ja\/gear-shift-fork-broaching\/#What_a_Gear_Shift_Fork_Does_in_a_Transmission\" >What a Gear Shift Fork Does in a Transmission<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"http:\/\/broachingmach.com\/ja\/gear-shift-fork-broaching\/#Which_Shift_Fork_Features_Are_Broaching_Candidates_%E2%80%94_and_Which_Are_Not\" >Which Shift Fork Features Are Broaching Candidates \u2014 and Which Are Not<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"http:\/\/broachingmach.com\/ja\/gear-shift-fork-broaching\/#Shift_Fork_Materials_and_How_They_Behave_Under_a_Broach\" >Shift Fork Materials and How They Behave Under a Broach<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"http:\/\/broachingmach.com\/ja\/gear-shift-fork-broaching\/#The_Volume_Economics_of_Broaching_a_Mass-Production_Part\" >The Volume Economics of Broaching a Mass-Production Part<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"http:\/\/broachingmach.com\/ja\/gear-shift-fork-broaching\/#Fixturing_an_Irregular_Part_Datums_Support_and_Distortion_Control\" >Fixturing an Irregular Part: Datums, Support and Distortion Control<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"http:\/\/broachingmach.com\/ja\/gear-shift-fork-broaching\/#Tolerances_and_Inspection_Position_Symmetry_and_Slot_Width\" >Tolerances and Inspection: Position, Symmetry and Slot Width<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"http:\/\/broachingmach.com\/ja\/gear-shift-fork-broaching\/#Machine_Selection_Vertical_Internal_Broaching_and_Automation\" >Machine Selection: Vertical Internal Broaching and Automation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"http:\/\/broachingmach.com\/ja\/gear-shift-fork-broaching\/#Related_Broaching_Case_Studies_in_Driveline_Components\" >Related Broaching Case Studies in Driveline Components<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"http:\/\/broachingmach.com\/ja\/gear-shift-fork-broaching\/#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-10\" href=\"http:\/\/broachingmach.com\/ja\/gear-shift-fork-broaching\/#Can_you_broach_a_gear_shift_fork\" >Can you broach a gear shift fork?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"http:\/\/broachingmach.com\/ja\/gear-shift-fork-broaching\/#What_type_of_broaching_machine_is_used_for_shift_forks\" >What type of broaching machine is used for shift forks?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"http:\/\/broachingmach.com\/ja\/gear-shift-fork-broaching\/#What_are_shift_forks_made_of_and_does_it_matter_for_broaching\" >What are shift forks made of, and does it matter for broaching?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"http:\/\/broachingmach.com\/ja\/gear-shift-fork-broaching\/#What_production_volume_justifies_broaching_fork_features\" >What production volume justifies broaching fork features?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n\n\n\n\n<p>That accuracy is exactly why shift fork production interests broaching engineers. A shift fork is not a round part, and most of its geometry belongs to forging, milling, and grinding. But the features that locate and orient the fork \u2014 the hub bore it mounts to or slides on, and the keyed or splined connections inside that bore \u2014 are classic internal broaching territory. The hub-bore keyway, internal spline, or formed groove is where a broach earns its place on a fork line, and it is also where the tolerances that govern shift quality live.<\/p>\n\n\n\n<p>This article walks through gear shift fork broaching feature by feature: what the part does, which features go to a broach and which do not, material behavior under a broach, volume economics, fixturing and distortion control, tolerances and inspection, and machine selection \u2014 in the same workpiece-case format as our other driveline component studies.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"What_a_Gear_Shift_Fork_Does_in_a_Transmission\"><\/span>What a Gear Shift Fork Does in a Transmission<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>A shift fork is the interface between the shift mechanism and the synchronizer. In a typical layout, each fork pairs with one shift rail and one synchronizer sleeve. When the rail moves, the fork moves with it, and its two fingers \u2014 engaging the circumferential groove machined around the sleeve \u2014 carry the sleeve axially along the spline teeth of the synchronizer hub. That stroke is what engages and disengages the gear pair. The fork carries real but modest loads: synchronizer reaction torque during the shift, and continuous contact against the groove flanks.<\/p>\n\n\n\n<p>Designs vary in how the fork is attached. In many constructions the fork is fixed to the shift rail by a pin, bolt, or clamp, with the rail sliding in housing bores. In others, the fork itself slides on a stationary guide rail or on the machined hub of the synchronizer assembly. Across all of these variants, one element is constant: a hub bore whose fit \u2014 and often whose keyed or splined connection \u2014 positions the fork in space and orients its fingers toward the sleeve groove.<\/p>\n\n\n\n<p>That orientation is the functional crux. If the hub-bore feature that sets angular position is off, the fingers sit skewed in the sleeve groove; the sleeve tilts instead of translating squarely, synchronizer loading becomes uneven, and shift feel degrades. That is why the small internal features of a fork \u2014 the very features a broach produces \u2014 carry geometric tolerances out of proportion to their size.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Which_Shift_Fork_Features_Are_Broaching_Candidates_%E2%80%94_and_Which_Are_Not\"><\/span>Which Shift Fork Features Are Broaching Candidates \u2014 and Which Are Not<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The honest starting point for any workpiece case is the division of labor: broaching does not make a shift fork \u2014 it finishes specific internal features after other operations have established the shape and datums. The features that realistically go to a broach fall into a short list.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Hub-bore keyways.<\/strong> Where the fork locates on its shaft or rail through a key, the internal keyway is the textbook broaching application: a straight-sided groove in a finished bore, cut in one pass with the broach guided by the bore itself. The method, tooling options, and process controls are the same ones covered in our <a href=\"https:\/\/broachingmach.com\/ja\/keyway-broaching-the-complete-guide\/\">complete guide to keyway broaching<\/a>.<\/li>\n\n\n\n<li><strong>Internal splines in the hub bore.<\/strong> Some fork designs use a splined connection to the shaft or hub \u2014 a sliding fit that lets the fork translate along spline teeth, or a fixed fit that locks angular position. Internal splines in a through-bore follow the same broaching practice used on other transmission components, with the fork&#8217;s irregular body as the main difference.<\/li>\n\n\n\n<li><strong>Formed and profiled grooves.<\/strong> Detent grooves for locking balls, shaped grooves that carry the shift mechanism&#8217;s locating function, and other straight-through internal forms can be broached where the geometry runs parallel to the stroke direction. If the form can be generated by a cutter translating along the bore axis in one line, it is a broaching candidate regardless of how irregular its cross-section looks.<\/li>\n<\/ul>\n\n\n\n<p>Equally important is what is <em>not<\/em> broached. The finger faces that ride in the sleeve groove are external, open-faced geometry; they are milled, ground or fine-machined where tolerances demand, and often surface-treated for wear. The fork body outline comes from the forging or powder-metal blank, and the hub bore itself is drilled, reamed, or bored before broaching \u2014 internal broaching pilots on the finished bore, so the bore defines the feature. A process plan that respects this division is the difference between a broach that holds tolerance for the life of the tool and one that fights the part.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Shift_Fork_Materials_and_How_They_Behave_Under_a_Broach\"><\/span>Shift Fork Materials and How They Behave Under a Broach<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Most volume-produced shift forks start as forged steel. Forgings suit the part well: the slender body, hub, and fingers form close to net shape with grain flow running where the loads run, leaving machining only on the functional surfaces \u2014 the bore, its internal features, and the finger faces. The steels are conventional engineering grades, and fork blanks reach the broaching operation in a heat-treatment state defined by the drawing; that state is a direct input to the broach design.<\/p>\n\n\n\n<p>The other common route is powder metallurgy. Compacted and sintered to near-net shape, powder-metal forks need very little machining \u2014 exactly their appeal at automotive volumes. For a broaching engineer, the forming route matters less than the material state: hardness, density, and microstructure set the tooth load the broach can carry, chip formation, edge preparation, and how the tool wears over its reconditioning cycle. Powder-metal parts bring added considerations around porosity at cut edges, which tool designers account for in tooth geometry.<\/p>\n\n\n\n<p>The practical takeaway: material condition belongs in the first exchange with a broaching supplier. The same feature cut in two different material conditions calls for two different broaches \u2014 tooth spacing, rake and clearance angles, coatings, and tool-life expectations all shift with it. Specifying material and hardness up front is how you get a tool that holds the tolerance instead of merely reaching it.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"The_Volume_Economics_of_Broaching_a_Mass-Production_Part\"><\/span>The Volume Economics of Broaching a Mass-Production Part<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Shift forks are quintessential automotive-volume parts: a single gearbox carries several, so the annual volume of any one fork design is a multiple of vehicle production. That is precisely the regime where broaching competes, and it deserves a clear-eyed comparison rather than a reflexive answer.<\/p>\n\n\n\n<p>Broaching wins on consistency and cycle time. One stroke generates the complete internal form, so the geometry lives in the tool rather than in machine kinematics or an operator&#8217;s offsets; part-to-part variation tracks tool wear, which is gradual and predictable, instead of the stack-up of a multi-step routine. On a high-volume line, a dedicated internal broach cutting a fork keyway in seconds fits naturally into a cell layout, and that repeatability is what lets downstream assembly and shift-quality audits run without surprises.<\/p>\n\n\n\n<p>Milling wins on flexibility. A machining center already on the floor can cut an internal keyway or slot with no dedicated broach to purchase, and it absorbs design changes and low-volume multi-variant programs without tooling consequences. For prototype forks, aftermarket runs, and small programs, milling is usually the right call.<\/p>\n\n\n\n<p>The decision is therefore a volume decision, made explicitly: a broach is ground for one feature on one part family, and the tooling investment amortizes against saved machine time and gained consistency as volume rises. We lay out the comparison \u2014 tooling cost, cycle structure, tolerance behavior, and where each process stops making sense \u2014 in <a href=\"https:\/\/broachingmach.com\/ja\/broaching-vs-milling-internal-keyways-profiles\/\">broaching vs. milling for internal keyways and profiles<\/a>.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Fixturing_an_Irregular_Part_Datums_Support_and_Distortion_Control\"><\/span>Fixturing an Irregular Part: Datums, Support and Distortion Control<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Shift forks are awkward parts to hold. Unlike the discs, hubs, and rings that make up most internal broaching work, a fork is a slender, offset, asymmetric body \u2014 a hub at one end, two thin fingers reaching away from it, and not much else. You cannot drop it onto a through-rod the way you would a ring gear. The fixture is engineered around the part, and on high-volume fork lines it is as much a design deliverable as the broach itself.<\/p>\n\n\n\n<p>Datum strategy comes first, and the guiding principle is datum consistency: the broached feature must relate to the same datums the part functions on. Because an internal broach guides in the bore, the hub bore is naturally the primary datum \u2014 the bore positions the tool, so the feature is located to the bore by construction. What the fixture adds is the angular and axial references: clocking the keyway correctly relative to the fingers, and depth from the reference face. The angular datum is often a machined pad, the finger envelope, or a dedicated process feature, and it must be one the rest of the process chain already respects.<\/p>\n\n\n\n<p>Distortion control is the second discipline. The broaching cut removes material from inside the hub while reaction loads push outward into the surrounding walls, and on a fork those walls connect to thin, compliant fingers. Poor support lets the hub yield elastically during the cut and spring back after it, so the feature measures differently in the fixture than on the checking fixture. Good fixturing answers with support directly under the hub, clamping against solid material rather than the fingers, and \u2014 where the design allows \u2014 sequencing broaching before finish machining of features it would disturb. On particularly slender forks, the fixture may carry adjustable finger-end supports purely to keep the body from acting like a spring.<\/p>\n\n\n\n<p>At volume, fixtures also carry the productivity argument: multi-part fixtures load several forks per stroke and spread stroke time across parts, with the caveat that total cutting load must be checked against machine capacity \u2014 the fixture bar is a tonnage decision as much as a convenience. The same fixture concept is what later connects the broaching station to automated loading.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Tolerances_and_Inspection_Position_Symmetry_and_Slot_Width\"><\/span>Tolerances and Inspection: Position, Symmetry and Slot Width<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The inspection scope on a broached shift fork feature clusters into three groups. Size \u2014 keyway width or spline tooth thickness \u2014 governs the fit to the mating key or shaft and is controlled on the broach by design and reconditioning. Form and finish in the cut feature affect function quietly but cumulatively. And then there are the geometric relationships, which on a fork carry the real weight: the angular position of the keyway or spline relative to the fingers, the symmetry of the feature about the bore&#8217;s reference, and the relationship of the feature to the part&#8217;s end faces.<\/p>\n\n\n\n<p>Angular position deserves special emphasis because it is the chain link between the broaching operation and the customer&#8217;s shift quality. The keyed or splined feature clocks the fork on its shaft; clocking sets where the fingers point; where the fingers point sets how squarely the sleeve moves. A keyway that meets its width tolerance but sits off its angular position produces a dimensionally &#8220;good&#8221; part that functions badly. Drawings encode this as true position or angularity to the finger datum, and broaching inherits it through the fixture&#8217;s angular reference \u2014 which is why fixture design and tolerance review belong in one conversation.<\/p>\n\n\n\n<p>On the shop floor, the scheme mirrors every other high-volume internal feature. Functional gaging \u2014 a go\/no-go plug for size, and a receiving gage that simulates the mating shaft with the angular reference built in \u2014 checks the feature the way the transmission will use it, at production speed. Coordinate measuring machines sample the same characteristics at lower frequency for full geometry, capability studies, and gage validation, and statistical process control tracks the broached feature like every other characteristic in the control plan.<\/p>\n\n\n\n<p>One discipline easy to underweight: burrs. A burr in the hub bore can shed into the gearbox&#8217;s lubricant and find the synchronizer; a burr at the finger roots or faces interferes with the sleeve groove. Deburring and burr verification belong inside the broaching operation&#8217;s scope, not at the end of the line, and edge condition belongs in the process documentation with the same seriousness as width and position.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Machine_Selection_Vertical_Internal_Broaching_and_Automation\"><\/span>Machine Selection: Vertical Internal Broaching and Automation<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>For the hub-bore features that dominate shift fork broaching, the default answer is a vertical internal broaching machine. The logic is straightforward: the features are short, the part is small, the broach guides in the bore, and a vertical stroking axis with the part fixtured on the table keeps the setup compact and chip flow clean. Keyways run with the standard setup \u2014 broach guided in a horn or bushing aligned to the bore \u2014 while splines and formed grooves use the corresponding dedicated internal broaches in the same machine concept.<\/p>\n\n\n\n<p>Sizing the machine is a calculation, not a guess: force follows from the feature geometry, the tooth rise built into the broach, the material and its condition, and the number of parts fixtured per stroke \u2014 and the machine should carry margin above the calculated load so the reconditioning cycle and any fixture-bar growth fit inside its capacity. Stroke length follows the feature plus approach and exit clearance, and the tool interface follows the fixture design.<\/p>\n\n\n\n<p>The other half of machine selection at fork volumes is automation, and it belongs in the specification from the start rather than retrofitted. A dedicated station earns its keep when loading, stroking, and unloading run as one rhythm: parts arrive oriented from upstream machining, are loaded into the multi-part fixture by a pick-and-place unit or shuttle, are broached in the loaded set, and leave for washing and gaging without an operator in the loop. In-machine probing and integrated gaging extend this, closing the loop between tool wear and compensation \u2014 and the machine&#8217;s control and interface provisions differ when the station is automated, which is why the automation intent belongs in the original specification. The configurations and options are covered in the <a href=\"https:\/\/broachingmach.com\/ja\/broaching-machines\/\">broaching machine overview<\/a>.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Related_Broaching_Case_Studies_in_Driveline_Components\"><\/span>Related Broaching Case Studies in Driveline Components<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Shift forks sit in a family of transmission and driveline parts where the same broaching logic applies: an internal formed feature, a high-volume program, and relationship tolerances that decide function. Three case studies on this site cover the pattern from different angles. <a href=\"https:\/\/broachingmach.com\/ja\/transmission-gear-internal-spline-broaching\/\">Transmission gear internal spline broaching<\/a> works through the classic internal spline application at gear-production volumes, including tolerance strategy and inspection. <a href=\"https:\/\/broachingmach.com\/ja\/steering-wheel-hub-internal-spline-broaching\/\">Steering wheel hub internal spline broaching<\/a> covers the same discipline on a forged blank, from spline data through tool design to bore preparation. And <a href=\"https:\/\/broachingmach.com\/ja\/connecting-rod-broaching\/\">connecting rod broaching<\/a> shows the other side of the pattern \u2014 a part where broaching holds a narrow scope inside a process chain dominated by boring and honing, exactly the division-of-labor reasoning a fork line also needs.<\/p>\n\n\n\n<p>The common thread is the working rule behind every one of these applications: when a formed internal feature repeats at production volume and its geometric relationships decide how the assembly behaves, the process that generates the whole form in one guided stroke \u2014 geometry locked in the tool \u2014 is the one that holds tolerance over the life of the program.<\/p>\n\n\n\n<h2><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><span class=\"ez-toc-section\" id=\"Can_you_broach_a_gear_shift_fork\"><\/span>Can you broach a gear shift fork?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Yes \u2014 for specific features, not the part as a whole. What a broach produces on a shift fork are the internal features of the hub bore: keyways that key the fork to its shaft or rail, internal splines where the design uses a splined connection, and formed grooves such as detent or locating grooves that run straight through the bore. The finger faces and body outline are not broached \u2014 they belong to milling, grinding, and the forging or powder-metal blank \u2014 and the bore itself is machined first, since the broach pilots in the finished bore.<\/p>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"What_type_of_broaching_machine_is_used_for_shift_forks\"><\/span>What type of broaching machine is used for shift forks?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>A vertical internal broaching machine is the typical answer, because fork features are short internal forms cut in a small bore with the tool guided by the bore or a bushing. Multi-part fixtures spread the stroke across several forks per cycle at volume, and selection comes down to stroke length, calculated force capacity with margin, tool interface, and \u2014 on high-volume lines \u2014 the automation interface, specified with the machine rather than added afterward.<\/p>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"What_are_shift_forks_made_of_and_does_it_matter_for_broaching\"><\/span>What are shift forks made of, and does it matter for broaching?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Volume-production forks are predominantly forged steel, with powder-metallurgy forks common where near-net compaction pays off at high quantities. It matters directly: material and heat-treatment condition set tooth loads, chip behavior, edge geometry, coatings, and tool life between regrinds, so the same feature in two material states calls for two different broaches \u2014 one of the first data points a tool designer asks for, alongside the drawing and annual volume.<\/p>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"What_production_volume_justifies_broaching_fork_features\"><\/span>What production volume justifies broaching fork features?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>There is no universal threshold, because the break-even is a cost comparison, not a part count: the dedicated broach and fixture amortize against machine time saved per part and consistency gained, so the answer depends on the feature, the cycle it replaces, and how many variants share the tooling. As a working pattern, prototypes and short runs are milled; sustained production volumes are where broaching&#8217;s one-stroke, tool-defined consistency pays. The practical route is to price both against the actual drawing and forecast volume.<\/p>\n\n\n\n<p>If you are machining shift forks \u2014 or quoting a fork program \u2014 and need an internal broaching operation engineered around the features on your drawings, that is precisely what we do. Send the part prints, material condition, and annual volumes, and we will return a machine and tooling configuration with force capacity, stroke, and fixturing worked out for the part. Start with the machine overview linked above, or go straight to our engineering team with your workpiece details.<\/p>","protected":false},"excerpt":{"rendered":"<p>Where broaching fits on gear shift forks: hub-bore keyways and splines, fixturing, tolerances, inspection and machine choice for production transmission parts.<\/p>","protected":false},"author":1,"featured_media":9236,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","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":"","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":"default","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],"tags":[],"class_list":["post-9248","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-broaching"],"_links":{"self":[{"href":"http:\/\/broachingmach.com\/ja\/wp-json\/wp\/v2\/posts\/9248","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/broachingmach.com\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/broachingmach.com\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/broachingmach.com\/ja\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/broachingmach.com\/ja\/wp-json\/wp\/v2\/comments?post=9248"}],"version-history":[{"count":1,"href":"http:\/\/broachingmach.com\/ja\/wp-json\/wp\/v2\/posts\/9248\/revisions"}],"predecessor-version":[{"id":9249,"href":"http:\/\/broachingmach.com\/ja\/wp-json\/wp\/v2\/posts\/9248\/revisions\/9249"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/broachingmach.com\/ja\/wp-json\/wp\/v2\/media\/9236"}],"wp:attachment":[{"href":"http:\/\/broachingmach.com\/ja\/wp-json\/wp\/v2\/media?parent=9248"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/broachingmach.com\/ja\/wp-json\/wp\/v2\/categories?post=9248"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/broachingmach.com\/ja\/wp-json\/wp\/v2\/tags?post=9248"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}