Capability

CNC Milling

3-axis and multi-axis milling for prismatic housings, chassis blocks and flanged bodies in aluminum, brass and stainless steel.

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Overview

Why This Service Exists

Milling is where most GRACTS parts start: a solid block becomes a pocketed housing, a slotted chassis or a flanged body held to drawing.

The Problem

Small-batch milled parts get rejected by large shops or quoted at production MOQs, so designers end up compromising the geometry to fit whatever a hobby mill can hold.

What You Get

You keep the geometry you designed. Pockets, bosses, counterbores and slots are cut to the drawing, and the same setup sheet is reused when you reorder.

Who It Is For

Built For These Projects

Prop and replica designers milling chassis plates and internal frames
EDC brands producing machined bodies, clips and hardware
Product teams needing functional aluminum housings before tooling exists
Equipment builders replacing a discontinued milled bracket or mount

Specifications

CNC Milling At A Glance

Figures below are the ones GRACTS publishes. Anything marked TBC is confirmed against your drawing before you order.

Typical geometry	Pockets, bosses, slots, counterbores, flats, tapped holes, engraved faces
Standard tolerance	±0.05 mm
Tight tolerance	±0.01 mm on high-precision features
General tolerance standard	ISO 2768-m
Common materials	Aluminum 6061 / 7075, brass C360, stainless steel 303 / 304 / 316L, carbon steel
Minimum order quantity	1 piece
Standard lead time	7–10 business days
Rush lead time	3–5 business days
Accepted files	STEP, IGES, DXF, PDF
Maximum part envelope	TBC — confirm with your drawing

Process

How The Work Runs

Drawing Review

We read your STEP or DXF against the PDF and flag anything that cannot be held before quoting.

Fixture Planning

Setups and workholding are decided so the critical datum is cut in one operation where possible.

Roughing

Bulk material is removed with the part still rigid in the fixture.

Finishing Passes

Critical faces and bores are finished last, to the tolerance called on the drawing.

Inspection

Dimensions called on the drawing are measured before the part leaves the shop.

FAQ

CNC Milling Questions

What tolerance can you hold on milled aluminum parts?

Standard milled work is held to ±0.05 mm. Where the drawing calls for it, tight tolerances to ±0.01 mm are achievable on high-precision features. Untoleranced dimensions follow ISO 2768-m.

Will you mill a single prototype?

Yes. The minimum order quantity is 1 piece, and single prototype orders are accepted.

What files do you need to quote a milled part?

A STEP, IGES, DXF or PDF file. If you only have a sketch, describe the part and we will tell you what is missing before quoting.

How long does a milled part take?

Standard lead time is 7–10 business days. Rush production in 3–5 business days is available — tell us your date when you send the drawing.

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