Wexmar provides CNC machining for automotive programs that fall outside high-volume captive production: prototypes, pre-production builds, aftermarket and performance parts, specialty and off-highway vehicle components, and tooling for assembly lines. As an automotive machine shop in Canastota, New York, we turn, mill and Swiss-machine steel, stainless, aluminum and brass parts in quantities from a handful of prototypes to several thousand pieces per release.
What automotive buyers order from a machine shop
Automotive work that reaches a precision job shop is usually either early in a program or specialized enough that dedicated transfer lines do not make sense. Typical parts include:
- Prototype shafts, hubs and spacers for drivetrain and suspension development.
- Fittings and adapters for fuel, coolant, brake and turbo plumbing.
- Brackets and mounting blocks for engine accessories, sensors and chassis components.
- Aftermarket and performance components such as billet adapters, bushings and caps.
- Specialty vehicle parts for fire apparatus, utility trucks, buses and off-highway equipment.
- Line tooling such as locating pins, nest blocks, gage details and fixture plates.
Materials common to automotive parts
Carbon and alloy steels such as 1018, 1045, 12L14, 4140 and 8620 cover most shafts, pins and hubs, with heat treat or case hardening performed through qualified outside processors. Aluminum 6061-T6 and 7075-T651 are used for brackets, billet components and fixtures. Stainless 303 and 304 appear on fittings and exhaust-adjacent hardware, and brass is common for sensor bodies and fittings. Engineered plastics such as acetal and nylon are used for bushings, spacers and fixture contact pads. Our materials page has notes on each grade.
Tolerances, finishes and documentation
Typical automotive tolerances run ±.0005 in. on bearing and press fits, ±.001 in. on locating features, and ±.005 in. on general profile, with surface finish of 32 to 63 Ra on functional surfaces. Fixture and gage details often carry tighter position tolerances than the production part they locate. Zinc plating, black oxide, anodizing and heat treat are completed through qualified outside processors.
On the documentation side, we provide dimensional inspection results, CMM reports, material certs and certificates of conformance, and we can complete first article inspection in AS9102 format or your own template. If your program requires specific PPAP elements, tell us which items and submission level at quote so the package is scoped correctly. Our quality system is ISO 9001:2015-aligned with NIST-traceable CMMs.
Quantity patterns: prototype, bridge and aftermarket
Automotive quantities at a job shop typically fall into four patterns:
- Prototype: 1 to 25 pieces, fast turnaround, often from a STEP model with a minimal drawing.
- Bridge or pre-production: 100 to 2,000 pieces while production tooling is finalized.
- Aftermarket and specialty vehicle: 50 to 5,000 pieces per release on repeat part numbers.
- Tooling and fixtures: 1 to 20 pieces per detail with tight position callouts.
For bridge and aftermarket work, we can hold bar stock by heat lot and run repeat releases against a blanket order, so each shipment matches the first article. Prototype orders are quoted on their own, since a design that is still changing is better served by short lots than by a large material commitment. If a prototype is headed for higher volume, our estimator can note which features drive cycle time so your engineers can weigh changes before the design freezes.
How our floor handles CNC machining for automotive
Turning
Ten CNC lathes, including Mazak Nexus and Multiplex machines and Doosan Lynx 2100A models, handle shafts, hubs and fittings. Live tooling and Y-axis add cross holes, flats and wrench features in the same setup. See our CNC turning page.
Horizontal milling
Six horizontal machining centers with pallet changers run 3- and 4-axis horizontal milling on brackets, blocks and fixture plates. One pallet loads while the other cuts, which suits repeat aftermarket releases.
Swiss and grinding
Four Maier MLK-32 Swiss machines handle small pins and fittings to 32 mm diameter, and centerless and surface grinders finish press-fit diameters and fixture faces.
Typical automotive parts, materials and tolerances
| Part | Common material | Typical tolerance | Primary process |
|---|---|---|---|
| Prototype axle shaft | 4140, 4340 | ±.0005 in. bearing seats | Lathe, centerless grind |
| AN or ORB adapter | 6061-T6, 303 | ±.001 in., class 3 threads | Swiss or lathe |
| Accessory bracket | 6061-T6 | ±.005 in. general | Horizontal milling |
| Locating pin | O1, 4140 hardened | ±.0002 in. OD | Lathe, grind |
| Sensor body | Brass C360 | ±.001 in. | Swiss |
| Fixture plate | 6061-T6, 1018 | ±.0005 in. hole position | Horizontal milling |
Getting a quote
Send the drawing or STEP file, quantity, target date and any documentation requirements. You can upload a drawing for an instant estimate, and a human estimator confirms every quote. For automotive work, call (315) 400-2654, Monday through Friday, 7 to 4 Eastern, or email ron@backwell.com.