6061 Aluminum Harmonic Reducer Reducer Housing Machining 0.015mm Concentricity
Harmonic Reducer Housing
,0.015mm Concentricity Reducer Housing
,Aluminum Bearing Bore Reducer Housing
The reducer housing decides how much backlash a robot joint has. The bearing bore and the flexspline register have to be concentric to a few hundredths, the mounting face has to be square to that bore, and the wall around the bearing seat has to stay round after the part is machined. We produce these housings on five-axis and turn-mill platforms, holding ±0.01 mm on the bore and 0.015 mm concentricity between bore and register.
Since the housing is a closed cavity with thin walls, most failures in this part come from fixture pressure and heat, not from the cutter. Our process plan fixes the clamping sequence and the semi-finish allowance before the first cut.
Process Plan
- 1Blank preparation. Aluminium block sawn oversize, all faces milled, then rough cavity opened on a three-axis centre to remove most of the stock and let internal stress dissipate.
- 2Five-axis finishing. Bore, register diameter, mounting face and bolt circle machined in one clamping on a five-axis centre, with the part supported by a bored soft jaw rather than clamped on the thin wall.
- 3Bore finishing. Boring bar rather than end mill for the final pass, so roundness and surface finish are controlled together and the bore does not taper.
- 4Sealing faces. O-ring grooves cut with a dedicated form tool, width and depth checked with a groove gauge before the part leaves the machine.
- 5Clean and inspect. Ultrasonic clean to remove swarf from the cavity, CMM check of bore, register and face, then protective packing.
Tolerances That Matter on This Part
| Bearing bore | ±0.01 mm diameter, roundness 0.008 mm |
|---|---|
| Concentricity | 0.015 mm bore to flexspline register |
| Mounting face | 0.02 mm flatness, perpendicularity 0.015 mm to bore |
| Bolt circle | Position ±0.02 mm, checked as a pattern |
| Sealing groove | Width and depth within 0.05 mm, verified with gauge |
Inspection Before Shipment
Each housing is measured on a CMM in the same clamping-free state it will be in when the customer bolts it up. Bores are checked at two depths to catch taper, the mounting face is checked for flatness and perpendicularity, and the sealing groove is checked with a gauge that mirrors the actual O-ring. Parts are then washed, dried, visually checked for chips in the cavity, and packed with the bore protected.
Housings with a bore out of tolerance are never reworked by hand polishing. They are re-machined or scrapped, because a polished bore loses its roundness even when the diameter reads correct.
Delivery You Can Plan Around
Samples ship in 6-10 days. Production batches run 16-25 days depending on cavity complexity and finishing. We keep the program, the fixture and the first-article record on file, so the second order starts from a proven setup. Monthly capacity for this family is around 8,000 pieces, and we reserve capacity for scheduled customers rather than first come first served.
Applications
- Harmonic and cycloidal reducer housings for cobot joints
- Servo actuator and joint module housings
- Rotary axis gearboxes on automation and inspection equipment
Send the housing model with the bearing and seal callouts - we will return a process review, price and delivery plan.
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