Precision Machining Services

Custom Prototype Development

Short-run, high-precision prototype machining for engineers who can't afford a missed deadline. Send us your print — we'll tell you straight up if we can hit it, when we can have it, and what it'll cost.

Send Us Your Drawing

Precision Machining For Prototype Work That Requires Accuracy The First Time

You've got a design. You need a part in your hand to test fit, prove function, or show a customer. And somehow, every shop you call treats your prototype like a favor — or won't quote it at all unless you're ordering 500 units.

Since 1995, Dun-Rite has built its business around the work other shops avoid: one-offs, short runs, tight tolerances, and fast timelines. You'll talk to a machinist, not a sales rep. You'll get a real quote, not a runaround. And you'll get your parts when we said you would.

When your prototype is approved and ready for production, you don't start over. Same shop, same fixtures, same inspection process — no new supplier to qualify, no weeks lost to onboarding. One vendor from first part to ten thousandth.

Blue Bunny brand logo with stylized blue text and bunny ears on the letter B.Block M logo in maize color representing the University of Michigan.Wells brand logo in red with cursive font inside an oval shape.

What We Handle at the Prototype Stage

Mill, lathe, and grinding capability with full in-house inspection — every process on your print handled under one roof, so your prototype doesn't bounce between three vendors to get finished.

Rapid Prototyping

One-off parts, first articles, and proof-of-concept builds. Quick quotes, fast setups, and rush orders when the timeline is tight.

CNC Milling & Turning

Multi-axis CNC milling and turning on HAAS, Doosan, and FADAL equipment. Complex geometries in aluminum, steel, stainless, and plastics.

Manual Machining for Fast Revisions

Bridgeports, Hardinge, Victor, and Cincinnati lathes for quick mods, one-off tweaks, and revisions without a full CNC setup.

Tight-Tolerance Grinding

Surface, ID/OD, and jig grinding for prototypes that need to hold tolerances other shops can't. If your callout is tight, send it.

Design-to-Part Collaboration

DFM feedback from the people actually making the part. We'll flag issues on the print before you commit to production.

Short-Batch & Pilot Runs

1 piece. 5 pieces. 50 pieces. Built for the volumes bigger shops won't quote without minimum-order friction.
Who Dun Rite is for

Who We Work With

If any of these sound like you, you're in the right place.

Mechanical & Manufacturing Engineers

You need a real part to test, not a render. Clean quotes, clear answers, no chasing.

Product Developers

Moving concept to proof-of-concept. We turn revisions fast without treating every change as a new job.

Startups & Hardware Teams

Not ordering 10,000 units yet? We'll make your first 10 — and be here when you're ready for 10,000.

OEMs & Established Manufacturers

Prototyping a new component or replacing a legacy part. Real documentation, real delivery discipline.

Why Dun-Rite?

Why Engineers Send Their Prototypes to Dun-Rite

We actually want the prototype work.
Most shops chase high-volume production and treat prototypes like a nuisance. We built our business around short-run and custom work. Your one-off isn't a problem for us — it's what we do.
Fast turnaround without cutting corners.
We take rush orders. We set realistic lead times. And when we commit to a date, we hit it. Predictability is the product.
One shop, from prototype to production.
When you're ready to scale, we're already set up. Same fixtures, same inspection, same people. You don't lose a month re-qualifying a supplier.
Problem-solvers, not order-takers.
You'll talk to a machinist, not a sales rep. If your print has an issue, we'll tell you. If there's a faster way to make the part, we'll tell you.
200+ years of combined experience.
Our team has seen the parts, the materials, and the edge cases. Nothing about your prototype is going to surprise us.
CNC milling machine cutting metal with coolant spray and metal shavings flying.

How It Works

Five steps from print to delivered part. No mystery, no runaround.
1. Send Us Your Drawing
Upload your print, STEP file, quantity, material, finish, and target ship date. Call out any FAI or documentation needs up front.
2. We Review & Quote
We review the print, flag any DFM issues early, and get you an accurate quote fast. No vague "we'll get back to you."
3. You Approve. We Build.
PO received, we schedule the job, source material, and start cutting chips. You get updates — not radio silence.
4. Inspection & Delivery
Every part gets inspected in-house on our CMM before it ships. Accurate parts, on time, with the docs you asked for.
5. Ready to Scale?
Prototype approved? We're already set up for production. No new supplier. No re-qualification.
Start an RFQ

What to Send With Your RFQ

Not sure if you've got everything? Send what you have. We'll ask what we need.

Start Your RFQ
The more complete your RFQ, the faster and more accurate the quote. Here's what we need:
Drawing (PDF is fine, STEP/IGES if you have it)
Quantity (one-off, short run, or projected volumes)
Material and spec (6061 vs 7075, 4140 vs 4340, etc.)
Special callouts (tight tolerances, critical features, GD&T callouts that need a second look)
Surface finish or coating requirements
Target ship date
Any quality documentation you need (FAI, ballooned print, material certs, CMM report)

Prototype Machining FAQs

Can you hit our tolerance requirements?
Most of the time, yes — including the tight callouts other shops avoid. Our grinding capability (surface, ID/OD, jig) is one of our biggest strengths. Send the print and we'll tell you straight.
What file formats do you accept?
PDF drawings, STEP, IGES, SolidWorks, and most common CAD formats. Got something unusual? Ask.
What's your lead time on a prototype?
Depends on complexity, material, and shop load. We quote realistic lead times and hit them. Rush orders welcome — ask when you send the print.
Do you work outside Michigan?
Yes. We're based in Webberville, right off I-96, and ship nationwide.
Can you move prototype work into production?
Yes. A lot of our prototype work turns into ongoing short-run or production jobs. Same shop, same process, no switching vendors.
Are RFQs free?
Yes. Always. No obligation, no pressure.
Industrial machining shop with rows of CNC machines under warm overhead lights.

Got a Print? Let's Make It.

Whether it's your first prototype or your hundredth, the process is simple: send the drawing, get a real quote, get parts you can count on.