A straight bevel gear needs a process route, not just a diameter limit.

These machines perform different stages

Two reciprocating gear-planing tools generate the teeth. The manufacturer describes single-piece, small-batch and batch production of small straight bevel gears. Its listed control has four axes with three simultaneous movements. This is not the YK2632 grinding process.

A grinding wheel and dressing arrangement finish the flanks. The manufacturer describes mass-production grinding and an automatic cycle except for loading/unloading. Specify the incoming tooth condition, hardness and grinding allowance; the page does not establish an automated loading line.

Define blank preparation, tooth cutting, any heat treatment, finishing and final inspection as a route. Whether both machines belong in it depends on the gear drawing and material. Their different size limits do not make one a larger version of the other. Spiral bevel gears require a different series selection.

Carry the cone geometry into the capacity check

Swipe the comparison on a phone. Dimensions marked with a published condition must be checked against the actual drawing.

YK2632’s page calls it a straight bevel grinder, but its pitch-diameter and cone-element table rows include a 30° spiral-angle condition. That inconsistency needs a written model-specific capacity confirmation. Do not treat 320 mm as an unconditional outside-diameter limit or use the wording to infer spiral-bevel capability.

Send tooth count, module convention, pitch and outside diameters, cone distance, root angle, shaft angle, ratio, face width and hub/shaft geometry together. Ask for the full arbor, clamp and tool interference drawing. A gear inside the headline diameter can still fail cone, tool or workholding clearance.

Workholding and the second flank are part of the job

YK2312 · paired cutting tools

The page names GR83-60I straight bevel gear-planing tools, 250–700 reciprocating strokes/minute and 28 mm maximum tool travel. Its listed overtravel is 3 mm at the small tooth end and 5 mm at the large end. Review cutter setting, sharpening, stroke clearance and the selected gear setup rather than interpreting strokes/minute as gears/hour. The work-spindle end-to-machine-centre window is 30–190 mm.

YK2632 · dressed wheel and both flanks

The page lists a Ø250 mm grinding wheel, 3000 rpm with variable-frequency regulation, two diamond dressing styluses and cradle rotation to process the other flank. Agree wheel specification, profile/radius, dressing interval and the complete two-flank sequence. The workpiece mounts on an arbor with hydraulic clamping; spindle-end-to-centre distance is 60–360 mm. Wheel speed is not a part-cycle guarantee.

Filtering and thermal conditions

YK2632 describes paper filtration, an oil-mist extractor and a thermostatic oil tank on special order. Specify coolant, filtration, temperature control and their delivery scope. YK2312 describes integrated coolant/hydraulic tanks and a temperature-controlled sealed electrical cabinet. That cabinet feature is not a guarantee of the part’s grinding or measuring temperature.

Turn “GB grade” into an inspection agreement

The manufacturer states GB6 capability for YK2312 and GB5 or better for YK2632. The reviewed descriptions do not give the full standard number, edition, measured characteristics and trial conditions behind those statements. They should be treated as manufacturer capability claims, not a certificate or a guarantee for every gear.

1. Define what the grade means on this drawing

   Agree the applicable bevel-gear standard and edition, required characteristics, tolerances, gauge capability and measurement uncertainty. Distinguish pitch/profile results from the mating pair’s contact pattern, backlash and running behaviour. Obtain the individual gear report and any agreed assembly test.

2. Use the production blank and arbor

   State material, hardness, heat-treatment condition, allowance and datum preparation. Inspect locating runout and clamping before cutting or grinding. Measure after the full flank sequence and release where the method requires it. Include wheel dressing or cutter re-setting in the trial plan.

3. Accept a stable run, not one selected tooth

   Agree sample size, thermal conditions, inspection frequency and tool/dressing intervals. Record loading, setup changes, both flanks, cleaning and measurement in cycle time. Specify how drift, rejected gears and an interrupted cycle are handled. Neither a maximum stroke rate nor an advertised grade supplies this production evidence.

Separate the current factory from each delivered configuration

The manufacturer traces its predecessor to 1951 and says it joined General Technology Group in December 2020. Its range includes gear shaping, milling, broaching, grinding, planing and lapping, specialist grinders and precision transmission products. This page reviews two straight-bevel models; the broader spiral-bevel and grinding ranges require their own model selection.

A 28 June 2026 Tianjin government portal report, sourced to Tianjin Daily, identifies the current company and describes a temperature-controlled workshop. Those reported manufacturing conditions do not establish that either reviewed model was built or tested there, or guarantee the buyer’s factory environment. Request the selected unit’s build, inspection and acceptance records.

YK2312 lists GSK control/servos as standard, with Siemens or FANUC on request. YK2632 lists Siemens 828D and five drive axes with three simultaneous movements. Quote the exact control, tooling, guarding, coolant package, installation, training and destination support. YK2312’s listed body is 1700 × 1650 × 1700 mm at 1.8 tonnes; YK2632 is 2800 × 2200 × 2200 mm at 8 tonnes, with a separate 1750 × 600 × 2000 mm electrical cabinet. Obtain the complete installed footprint and utilities.