A 30-inch propeller pushes several hundred newtons of thrust into a motor that was designed around radial load. If the housing has no thrust path, that load lands on the bearing balls as axial preload, and the motor runs hot at hover and fails at a few hundred hours instead of a few thousand.

This housing gives the load a machined path: a thrust washer pocket behind the front seat, ground parallel to 0.01 mm, takes the axial load on a washer instead of the balls. The two seats are line bored in one setup to 0.008 mm, so the rotor spins on one axis, and the retaining groove is cut after anodizing so the stack height never changes between the dry build and the delivered part.

• Thrust path — pocket parallel to 0.01 mm carries axial load on a washer, not the ball set.
• One bore line — 0.008 mm coaxiality across front and rear seats.
• Groove after coating — retaining ring position held ±0.02 mm once anodizing is finished.
• Wall stiffness — 4.5 mm wall, checked by ultrasonic on every part.

1. Bearing stack review — bearing series, preload method, thrust washer thickness and propeller load confirmed before machining.
2. Material verification — 7075-T5 received by heat number, ultrasonic checked, 3.1 certificate retained.
3. Rough turning — OD, stator bore and both bearing bores roughed with 1.0 mm allowance, symmetrical removal.
4. First stress relief — low-temperature relief before the 4.5 mm wall is finished.
5. Semi-finish — stator bore and seat bosses semi-finished with light radial engagement.
6. Second stress relief — a second cycle, then the stator bore is finished to H7 with cylindricity checked through the stack.
7. Line boring and thrust pocket — both seats bored in one setup to 0.008 mm, thrust pocket turned parallel to 0.01 mm in the same clamping.
8. Hard anodizing and groove — 25 µm hard anodizing with seats masked, retaining groove cut after coating to hold stack height.
9. Verification — CMM report on coaxiality, pocket parallelism, groove position and bore cylindricity, FAI shipped.

• Bearing stack — deep groove, angular contact pair, or ceramic hybrid with a wave washer.
• Preload — fixed shim, spring washer, or a threaded preload ring.
• Thrust path — washer pocket, needle thrust bearing, or a hardened insert seat.
• Cooling — plain wall or finned OD, with a thermal interface flat to 0.02 mm.
• Sampling — 1 pc assembled with your bearing set for an axial play and run-in check.

Motor geometry, stator stack and winding data are competitive information, so access is limited from the drawing stage onward.

• NDA first — mutual NDA and non-circumvention signed before any file is exchanged.
• Isolated area — dedicated machines and authorized staff, no phones or photography inside.
• Codified routing — internal codes on travelers and labels instead of your part numbers.
• Data control — per-project folders on a permission server, destroyed on request with a record.
• No display — no drawings, part photos or logos in samples, catalogs, the website or social media.

Dongguan Changxinda Precision Technology Co., Ltd. — founded in 2008, 90-102 staff, ISO 9001:2015 certified, annual sales USD 10-20 million, export share 50-60%, serving customers in Europe, North America, Japan and Southeast Asia.

Machining, stress relief, anodizing and metrology run in one plant: 5-axis and 4-axis machining centers, turn-mill centers, surface grinders, wire EDM, CMM, 2.5D vision metrology and automated anodizing lines. About 12,000 aluminum parts ship each month, most of them small precision parts where the fixture and the boring sequence decide the result.

1. 01 Consumer Electronics — Phone, tablet and laptop housings · heat sinks · camera brackets · VR/AR headset structural parts · smart wearable housings
2. 02 Automation & Industrial Equipment — Automation jigs · fixtures · module frames · transmission sliders · motor mounts · sensor housings · conveyor line components
3. 03 Semiconductor & Vacuum Equipment — Vacuum chambers · vacuum fittings · semiconductor equipment precision bases · thermal insulation parts · inspection fixtures
4. 04 Medical Devices — Surgical instrument bases · medical device housings · endoscope components · aesthetic equipment structural parts (medical grade aluminum / stainless steel)
5. 05 Automotive — EV motor housings · battery end plates · sensor brackets · lamp structural parts · aftermarket parts · hydraulic valve blocks
6. 06 Aerospace & UAV — Aircraft structural parts · UAV frames · landing gear components · avionics instrument housings (lightweight precision parts)
7. 07 Optics & Photonics — Optical lens barrels · lens mounts · light source heat sinks · camera module brackets · inspection optical stages
8. 08 Telecommunications — 5G heat sink cavities · filter housings · signal adapter brackets · telecom equipment enclosures
9. 09 Robotics — Robotic arm joint parts · robot bases · reducer housings · AGV chassis structural parts
10. 10 Instruments & Meters — Inspection equipment housings · precision gauge bases · flow meter parts · laboratory equipment components

Two shifts 07:30-22:00, six days a week, with weekend shifts in peak season. Capacity is locked weekly for volume programs, so a rush order never displaces a scheduled batch.

• Samples — 7-10 days, checked on your stator or bearing set before the batch is released.
• Batch — 15-20 days from deposit and drawing approval.
• Buffer stock — semi-finished stock for repeat models, cutting repeat lead time by about 30%.
• Shipping — DHL/FedEx/UPS in 3-5 days for samples; air or sea for volume; EXW Dongguan, FOB Shenzhen or CIF.
• Documents — FAI, 3.1 material certificate, CMM report and packing list with every shipment.

Send STEP / IGES / DWG / PDF and receive DFM feedback plus a formal quotation within 24 hours.

Dongguan Changxinda Precision Technology Co., Ltd. · ISO 9001:2015 · Dongguan, Guangdong, China