Four rubber grommets in four holes sound forgiving. They are not. If the seats are 0.05 mm off the motor axis, the rubber is pre-loaded sideways before the drone ever takes off, and the mount isolates in one direction while passing vibration straight through in the other. The result is a gyro trace that looks fine on the bench and noisy in hover.

Here the four seats, the motor pad and the ESC pocket are machined in one clamping from the same datum, so the rubber sits concentric and works in shear as designed. The isolation gap between the plate and the arm boss is held to ±0.05 mm — too tight and the rubber bottoms out, too loose and the plate rocks.

• Seats on axis — four grommet bores concentric to the motor axis within 0.01 mm.
• Gap control — 2.0 mm ±0.05 mm isolation gap, so the rubber deflects instead of bottoming out.
• Pad accuracy — 0.01 mm flatness keeps the motor can square to the thrust line.
• Thermal path — ESC pocket flat to 0.02 mm so the thermal pad actually contacts.

1. Vibration and thermal review — motor model, grommet size, ESC footprint and airflow direction confirmed; seat layout agreed before machining.
2. Material verification — 6061-T6 received by heat number with ultrasonic check and 3.1 material certificate.
3. Rough machining — plate, arm boss and ESC pocket roughed with 0.6 mm allowance, symmetrical removal to keep the plate flat.
4. First stress relief — low-temperature relief before the isolation gap is opened.
5. Semi-finish — pad boss, grommet bosses and channel semi-finished with light radial engagement.
6. Second stress relief — a second cycle so the 2.0 mm gap and the plate stay flat after finishing.
7. Finish machining — motor pad, bolt circle, four grommet seats and ESC pocket finished in one clamping from one datum.
8. Masking and anodizing — motor pad and grommet bores masked, black anodizing 15-20 µm, seats re-checked afterwards.
9. Verification and packing — seat concentricity on CMM, thermal pocket flatness checked, FAI and report shipped with the parts.

• Seats — 4 seats, 3 seats, or a two-stage isolator with a second rubber layer.
• Motor pattern — 16 x 16 to 30 x 30 mm PCD, M2.5 to M3, with timing slots if required.
• Thermal — ESC pocket depth and footprint matched to the actual board plus thermal pad thickness.
• Material — 6061-T6 for cost, 7075-T6 where the mount also carries the arm load.
• Sampling — 1 piece for a vibration trial on the bench, then volume on the same program.

An isolating mount exposes the motor choice, the ESC layout and often the control architecture. That stays inside the project.

• NDA before drawings — mutual NDA and non-circumvention signed before files are exchanged.
• Isolated cell — dedicated machines, authorized staff, no photography or phones inside.
• Codified production — internal codes on travelers and labels instead of your part numbers.
• Data isolation — programs and models per project on a permission server, destruction on request with a record.
• No leakage — 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%, with customers in Europe, North America, Japan and Southeast Asia.

Machining, stress relief, anodizing and metrology are all in-house: 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 structural parts where the fixture decides 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, and rush orders are scheduled on a separate line.

• Samples — 7-10 days, validated on your bench 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