Drawing review
Tooth data, cone angles, mounting distance, bore fits and any heat treatment are confirmed for each pair before programs are written.
TRANSMISSION COMPONENTS
Straight Bevel Gear Pairs
Matched straight bevel pairs for 90 degree drives, with hubbed blanks, H7 bores and tooth contact set by mounting distance rather than by the outside diameter.
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Typical requirements
- Gears
- Straight bevel pinion and gear, supplied as matched pairs
- Shaft angle
- 90 degrees
- Material
- 42CrMo4 (1.7225) alloy steel
- Bores
- H7 fits, with keyways or set-screw holes on the hubs
- General tolerance
- ISO 2768-m
- Inspection
- Bore fit, mounting distance, tooth runout to the bore, contact check of each pair
Engineering considerations
- Pitch cone angles follow from the ratio. For a 1:3 pair at 90 degrees they are about 18.4 and 71.6 degrees. Contact depends on mounting distance, so each gear is measured from its own back face and bore rather than from the outside diameter.
- Pinion and gear are cut, checked and packed as a pair. The contact pattern belongs to the pair, not to each gear on its own.
- On small pinions the hub keyway or set-screw hole sits close to the tooth root. Holes are drilled after the bore is finished, and the bore is rechecked afterwards.
- Where pairs are hardened, the drawing states which faces are finished after heat treatment, so bore and back face stay true to the teeth.
Typical manufacturing route
Blank turning
Bore, back face and cone surfaces are turned in one clamping, so the teeth are later cut and checked from the same reference.
Tooth cutting
Teeth are cut to the drawing data, with pinion and gear kept together as a matched pair.
Secondary features
Keyways and set-screw holes are machined, tooth edges are deburred, and each pair is marked and packed together.
Typical inspection plan
- Bores checked with plug gauges against the H7 limit.
- Mounting distance measured from the back face, and tooth runout on a mandrel through the bore.
- Where the drawing requires it, each pair is rolled together to check the contact pattern.
- Tooth data, keyway width and general dimensions recorded on the inspection report.
Applying this to your part
The actual route, tolerances, inspection scope and records are agreed for each drawing during quotation.
Engineering guides for parts like this
Engineering guideTolerances and CNC Machining Cost on Bearing Seats, Bore Positions and Hole PatternsHow bearing seat fits, bore position tolerances and bolt hole patterns change the machining and inspection route, with ISO 286 fit examples, position versus…Read the guideEngineering guideBatch-to-Batch Consistency in CNC Machining: How Repeat Orders Stay IdenticalWhere variation between CNC machining batches comes from, how an approved route is frozen and controlled, and what buyers can specify so repeat orders…Read the guide
PROJECT INQUIRY
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