What tolerance do harmonic drive interfaces on robot joints actually need?

Concentricity of 0.01–0.02 mm on the bearing seats and register diameters is the working requirement for most harmonic and cycloidal interfaces. We machine joint housings in 7075 or 17-4 PH on 5-axis centres and inspect those features on CMM per part, not per batch.

Can one supplier handle a robotics BOM of 50–200 machined parts?

That is the exact case a factory network exists for: milling, turning, Swiss and EDM parts on one BOM get routed to plants by capability class, while quoting, inspection format and shipping stay with one contract. You do not reconcile three vendors when two parts fail to mate.

How is robot design IP protected when parts are made in China?

Files are encrypted and NDA-covered from upload. A partner plant receives only the drawings its own job needs — never the full BOM, which is effectively the blueprint of the robot — and onward sub-contracting without written approval is grounds for removal from the network.

Industry

Robotics

Name: CNC Machining for Robotics
Brand: FabVector

From humanoid joints to AMR frames: precision parts at iteration speed for robot builders.

FabVector machines Robotics parts in Aluminum 7075-T6, Aluminum 6061-T6, Stainless Steel 17-4 PH, from 1 piece, with instant online estimates, engineer-reviewed quotes in 24 hours and NDA-protected files. Delivery with duties handled to the US, Canada, UK and Australia.

Materials: Aluminum 7075-T6, Aluminum 6061-T6, Stainless Steel 17-4 PH
Minimum order: 1 piece
Estimate: ~60s online
Quote: engineer-reviewed 24h
IP: NDA from upload

What slows this industry down

A robotics BOM routinely carries 50–200 custom machined parts — and a design that changes monthly, so slow quoting costs more time than machining itself. Joint housings demand 0.01–0.02 mm concentricity on harmonic drive interfaces, which most general shops cannot hold reliably. Volumes are awkward: 1–5 prototypes one month, a 500-piece pilot the next, and few vendors price both well. And the full machined BOM is essentially the blueprint of your robot, so IP protection has to be structural, not a promise.

Typical parts we machine

Joint and actuator housings (harmonic/cycloidal interfaces)
Structural frame plates and chassis nodes
Motor mounts and gearbox adapters
Sensor and encoder brackets
End-effector fingers and tooling plates

Recommended materials

01Aluminum Alloys

Aluminum 7075-T6

Aircraft-grade aluminum: steel-level strength at a third of the weight.

02Aluminum Alloys

Aluminum 6061-T6

The default CNC aluminum: strong enough for most jobs, machines fast, anodizes well.

03Stainless Steels

Stainless Steel 17-4 PH

Stainless that hardens like tool steel: 1,310 MPa in H900 with minimal distortion.

04Engineering Plastics

POM (Delrin / Acetal)

The machinist's favorite: stiff, slippery, stable — plastic parts with metal-like precision.

Recommended finishes

01Anodizing

Hardcoat Anodizing Type III

Wear armor for aluminum: an oxide layer as hard as tool steel.

02Anodizing

Anodizing Type II (Dyed)

Color that cannot peel: dye locked inside the part’s own oxide layer.

03Mechanical Finishes

Bead Blasting

The uniform matte look: erases tool marks, hides fingerprints, preps perfect anodizing.

Certifications & standards

ISO 9001: We understand robotics buyers expect ISO 9001-grade process discipline — documented inspection and revision control on every order.
CE: We support CE compliance at machine level by supplying parts to print with the dimensional records your technical file needs.

We understand and support these requirements; certification and documentation scope is confirmed per order.

Questions robotics buyers ask

What tolerance do harmonic drive interfaces on robot joints actually need?: Concentricity of 0.01–0.02 mm on the bearing seats and register diameters is the working requirement for most harmonic and cycloidal interfaces. We machine joint housings in 7075 or 17-4 PH on 5-axis centres and inspect those features on CMM per part, not per batch.
Can one supplier handle a robotics BOM of 50–200 machined parts?: That is the exact case a factory network exists for: milling, turning, Swiss and EDM parts on one BOM get routed to plants by capability class, while quoting, inspection format and shipping stay with one contract. You do not reconcile three vendors when two parts fail to mate.
How is robot design IP protected when parts are made in China?: Files are encrypted and NDA-covered from upload. A partner plant receives only the drawings its own job needs — never the full BOM, which is effectively the blueprint of the robot — and onward sub-contracting without written approval is grounds for removal from the network.