Specifying CNC Machined Automation Parts (DFM Guide)
How to specify CNC machined automation parts — fixtures, manifolds, end-effectors — so they locate repeatably, resist wear, and stay in tolerance through production.
Automation for Your Industry
When a production line goes down for a line upgrade or a new product launch, the window for new fixture and tooling parts is short — often 2–4 weeks. We support automation integrators and end-users with parallel scheduling, weekly progress photos, and the flexibility to change designs mid-project.
Typical Parts We Make for Automation Customers
- Custom fixture plates and locating blocks
- Pneumatic and hydraulic manifold blocks
- Conveyor side rails, guides and wear strips
- Pick-and-place end-effector brackets
- Indexing tables, star-wheel components
- Vision-system mounts and lighting brackets
Common Materials and Grades
- Aluminum 6061-T6 — default for fixtures, brackets and frames
- Hard-coat anodized 7075 — for high-wear locating surfaces
- POM / Delrin — sliding surfaces, soft jaws, wear pads
- Stainless 304 / 316 — for food & beverage and pharmaceutical lines
Tolerances and Finish Capabilities
| Specification | Capability | Notes |
|---|---|---|
| Standard tolerance | ±0.05 mm | Per ISO 2768-m |
| Locating pin / bushing tolerance | ±0.01 mm | For repeatable fixturing |
| Surface finish | Ra 0.8 µm | Bearing and locating surfaces |
| Hard-coat anodize | Type III, 50µm | Wear-resistant locating surfaces |
DFM checklist for automation parts
- Locating surfaces: hold ±0.01 mm and call out position GD&T so fixtures repeat batch to batch.
- Hard-coat anodize (Type III) the wear surfaces on 7075 rather than running bare 6061.
- Design manifolds with generous port spacing to suit the drill and step-drill cycle.
- Use POM or Delrin for sliding and soft-jaw surfaces; avoid tight tolerances on plastic, which creeps.
- Allow a stress-relief pass on large thin plates before finish machining.
For the full part-by-part catalog — materials, the tolerances that matter, and how each part is machined — see our CNC machining automation parts page.
FAQ
Frequently Asked Questions
How do you handle tight shutdown windows?
We run parallel scheduling across our 40+ machine pool and assign a dedicated engineer to fast-track fixture and tooling orders. We send weekly progress photos and offer expedited inspection and shipping for shutdown-critical jobs.
Can you modify a fixture design mid-build?
Yes. We can revise dimensions, hole patterns or features without scrapping the program — typically within 1–2 days. We send a revised drawing for your approval before any changes are machined.
Do you support aftermarket and spare parts?
Yes. Many of our automation customers keep us on retainer for spare-part orders. We hold your fixture and program in storage, and can re-run small batches (10–50 pieces) with 1–2 week lead time when a line goes down.
What tolerance do automation fixtures and sensor brackets need to repeat?
We hold locating features to ±0.02 mm and mounting patterns to ±0.05 mm so assemblies repeat build to build. See our automation parts guide.
Can you turn parts around inside a short line-down window?
Yes — prototypes in 5–7 days and small batches quickly; tell us the line-down date and we plan the queue around it.
Ready to start your project?
Send drawings — get a detailed quote within 24 hours.
Knowledge base: Browse the CNC Machining Knowledge Base