A robot joint drive train runs motor, motor mount, reducer, output flange and arm segment. The motor mount is the locating datum of that chain; once it is off, every downstream part can only compensate passively.

• Spigot fit — H7/h6 fit with clearance held at 0.005-0.02 mm, so radial misalignment turns directly into backlash.
• Face runout — spigot face runout 0.01 mm prevents extra bending load on the reducer input shaft.
• Bolt circle — hole position ±0.02 mm on an even bolt circle, preventing flange warp during tightening.
• Stiffness — wall thickness and ribs are designed around the load case; thin-wall motor mounts deflect elastically under impact loads.

Motor mounts are volume parts, and one good piece does not make a good batch. We run first article plus in-process sampling on critical dimensions and keep SPC records.

Servo motors and reducers from different brands have completely different interfaces. We machine to the motor and reducer models you specify.

• Interface matching — send motor and reducer models and we check spigot, bolt circle and shaft extension space against the maker drawings.
• Structure Customization — vertical or horizontal, single or dual motor, brake space and encoder cavity all available.
• Material Options — aluminum for weight, ductile iron for damping, stainless for corrosion resistance, selected by operating conditions.
• Volume Ramp-Up — 1 sample, then a 30-piece pilot run, then 5,000-piece production on the same program with no line change.

Confidentiality is enforced by contract, not by good intentions. An NDA can be signed before drawings are shared, and every step stays traceable.

• NDA First — mutual NDA plus non-circumvention terms; file transfer starts only after signing.
• Isolated Secure Area — access-controlled entry, no non-project staff, no photography inside.
• No Leakage — drawings, part photos and customer brands never enter sample cabinets, catalogs, the website or social media.
• Data Access Control — CAD files sit on an access-controlled server, isolated per project and destructible after delivery.
• Codified Routing — traveler cards and labels use internal codes instead of customer part numbers and project names.
• Sample Management — customer prototypes are numbered and logged, then returned or destroyed as agreed at project end.

Dongguan Changxinda Precision Technology Co., Ltd.Since 2008 we have been providing custom precision machining in Dongguan, with a team of 90-102 staff, serving 200+ Customers, export share 50-60%, annual sales of USD 10-20 million, ISO 9001:2015 certified.

Robot parts are judged by whether they assemble, not merely whether they can be made: a joint is a chain of flange, housing, link and bearing seat, and any out-of-tolerance part is amplified at the assembly end. That is why turning, milling, grinding and inspection all run inside one plant, keeping the tolerance chain closed internally instead of exposing it on the customer's line.

• Reserved Capacity — machine time is locked weekly for volume programs, so rush orders never displace batch schedules.
• Two shifts, six days a week — production runs 07:30-22:00, with weekend shifts added in peak season.
• Buffer Stock — semi-finished stock for repeat models cuts repeat order lead time by 30%.
• Visible Progress — weekly progress sheet plus shop floor photos, tracking number provided at shipment.
• Shipping Methods — samples via DHL/FedEx/UPS in 3-5 days, volume by air or sea, EXW / FOB Shenzhen / CIF.