Precision CNC-Machined 6061-T6 Aluminium Brake Mounts for Servo Motors & Humanoid Robots

1. What Makes Brake Mounts for Servo Motors Different

A brake mount is a structural interface — it locates the brake to the motor and carries load without flexing.

Coaxiality with the motor bore: The central bore and the mounting face have to be coaxial, so the brake rotor runs true with the shaft. A few microns of offset adds vibration and brake noise.

Lightweight, rigid design: At 0.04 kg per part, the mount has to stay light for robot arm dynamics while still carrying brake torque — 6061-T6 extrusion balances stiffness and weight.

Radial mounting tabs: Multiple lugs around the ring carry the mounting bolts, each with a through-hole. Their bolt circle has to match the motor and brake patterns within a tight band.

In-machine threads: M5 threads are milled in the same setup as the datum holes — no tapping after the part leaves the machine, no thread error from re-fixturing.

No secondary finishing: Supplied in T6 as-machined condition, no anodize or plating — the part ships straight off the mill after deburring and cleaning, which cuts lead time and cost.

RoHS2.0 compliance: Material and process meet RoHS2.0 for overseas motor customers, with no hazardous surface treatment to validate.

2. Material Selection by Application

6061-T6 extrusion is the standard for lightweight motor brackets — it machines cleanly, takes T6 temper straight from the extruder, and needs no extra surface treatment.

3. Machining Strategy: Two-Fixture Production

A brake mount needs both sides machined — the datum face and the reverse face — and the trick is holding both in tolerance without re-fixturing error.

Raw extrusion: Parts start from 6061-T6 extruded bar on a dedicated die , cut to blank length. The extruded profile already approximates the ring, so CNC only removes material on critical faces.

First setup — datum side: CNC milling on the opposite-clamping vise machines B-side datum holes, inner bore and three M5 thread holes. Threads are milled in-machine, not tapped, for consistent depth and class.

Second setup — reverse side: A two-plate interchangeable workholding fixture takes the part over, machining the outer profile and reverse features. Datum holes from the first setup locate the part, so both sides share the same datums.

Deburr & clean: Hand deburring removes tool marks from edges; parts are cleaned and packed ready for the motor assembly line.

Verification: Dimensional inspection and visual check on every batch — critical diameters, bolt circle and thread gauges confirmed against drawing .

4. Case Study: Brake Mounts for a Servo Motor OEM

An overseas servo motor and humanoid robot actuator manufacturer engaged KGL to produce 6061-T6 aluminium brake mounts for a new motor platform, moving from prototype into volume production.

Challenge: 6061-T6 extruded mounts, T6 as-received with no surface treatment, central bore coaxiality, radial mounting lugs, three in-machine M5 threads, and RoHS2.0 compliance — at 0.04 kg per part across a family of variants.

Solution: Two-fixture CNC production on Mazak HCN5000L horizontal machining centers, with a dedicated two-plate interchangeable workholding fixture. First setup machines datum holes, bore and threads; second setup machines the outer profile. Once samples passed customer CMM inspection, fixturing and programs were documented and frozen.

Result: Across a pilot run of 1600 mounts, batch-to-batch variation stayed below 0.005 mm on critical features, first-pass yield exceeded 98%, and the full pilot batch was delivered on schedule for production release — no anodize, no secondary operations, just as-machined and ready to ship.

5. Lead Time & Cost Guidance

Extruded aluminium brackets fall into three delivery tiers, driven by fixture complexity and variant count:

Single prototype (5–20 pcs): 7–10 days, including fixture setup and first-article inspection.

Engineering batch (50–200 pcs): 15–25 days, including process validation.

Volume production (500–5000 pcs): 30–45 days, with dedicated workholding and batch inspection.

Design tip: On extruded brackets, the extruded profile and the two-fixture datum scheme — not the overall size — drive cost. Off-the-shelf extrusion dies and standard workholding reduce tooling; keeping mounting holes within a single machinable face avoids a third setup.

6. Start Your Project

Ready to transition your servo motor brackets from drawing to production? We make engineering evaluation seamless and secure:

Step 1: IP Protection First — We are happy to sign an NDA before you share sensitive design files.

Step 2: Submit CAD Files — Upload 3D files (.STEP/.IGES) accompanied by 2D drawings specifying critical tolerances and material requirements.

Step 3: Rapid DFM & Quote — Receive a formal quotation, tolerance feasibility analysis, and cost-reduction DFM feedback within 24–48 working hours.

Required Files for Instant Review: 3D CAD (.STEP, .IGES) + 2D Drawings (.PDF) | Material Grade | Surface Finish | Batch Quantity

Frequently Asked Questions (FAQ)

Q: Can you machine both sides of a bracket in tolerance?

A: Yes. We use two-plate interchangeable workholding — datum holes from the first setup locate the part for the reverse setup, so both sides share the same datums and hold coaxiality.

Q: Can you mill threads in-machine instead of tapping?

A: Yes. M5 and larger threads are milled in the same setup as the datum holes, with consistent depth and class — no secondary tapping or re-fixturing.

Q: What extrusion profiles can you work with?

A: We machine 6061-T6 extruded profiles from customer-supplied dies or standard stock. Bring your die number or drawing and we will quote the machining.

Q: Do you provide RoHS2.0 documentation?

A: Yes. 6061-T6 as-machined parts meet RoHS2.0, and we can provide material declarations per requirement for overseas motor customers.

Q: What files are needed for a quote?

A: STEP-format 3D models + 2D drawings, plus material grade, extrusion die info (if any), and quantity requirements.

Q: How do you protect our IP and sensitive designs?

A: IP security is paramount. We routinely execute standard or customer-provided NDAs before receiving any technical data. All CAD files are managed on secure, restricted-access servers and used strictly for quoting and manufacturing purposes only.

Contact

Website: https://www.kglprecision.com

Email: kgl@kglmfc.com

Phone: +86-755-23011758