CNC machining, priced by the engineer who's actually going to cut it.

3 and 5-axis milling and turning for tight-tolerance metal and plastic parts, reviewed against real tooling before you're quoted — not run through an algorithm that guesses at your geometry. A price an engineer puts their name to, from one prototype to a full production run, in the same shop, under the same quote.

Get my CNC quote →See tolerances & materials ↓

Engineer-reviewed quote back in 24–48 hours.

A 5-axis CNC milling machine cutting an aluminum part in OperGo's machine shop

Variants as references

One part. Its own numbered SKUs.

Upload a part once. Every finish combination becomes a numbered variant — the base reference plus a 2-digit code — its own orderable SKU. Change the finish, not the file.

One CNC-machined aluminum part shown in several surface finishes, each an orderable variant
One machined part, finished several ways — each finish its own orderable SKU, all from a single file.
Stirrup bracket X5684487 · CNC · 6063
Selection
5684487As-machined — no finishes
OPG-6082-REV.C
568448751Gold anodized · laser · bag · pack
OPG-6082-REV.C
568448765Black anodized · laser · bag · pack

+ 40 more variants — same 5684487 part

±0.02mmtightest tolerance we hold, priced only on the features that actually need it
3 & 5-axismilling plus CNC turning with live tooling, in the same shop and the same quote
1 → 10,000+parts per order — the same tolerances at part one and at part ten thousand
1 business dayfor a real, engineer-checked quote on most parts

Proof, not a claim

A global fashion group validates parts against the drawing with 3D metrology.

Critical dimensions can be checked against the original CAD before a part moves forward — the same 3D metrology scanning a global fashion group uses OperGo for, comparing a physical part to its design rather than spot-measuring a few features by hand.

CNC-machined 6061-T6 aluminum part, engraved with material grade and serial number
Machined complete, marked with material grade and a serial number — not just a part name on a packing slip.
CNC-machined 7075-T6 aluminum part with cobalt blue anodized finish
Finished to spec — anodizing, powder coating, painting or polishing quoted alongside the machining, not sourced separately.

Priced by a person, not a pricing engine

Instant-quote platforms price the geometry they can see.

Upload a file to most CNC marketplaces and an algorithm reads bounding box, hole count and material — then pads the price for whatever it can't parse (a tight tolerance, a thin wall, a fixture your part actually needs), or rejects the part outright as unmachinable. It also can't tell you whose shop that file just got forwarded to. Send the same file to OperGo and a manufacturing engineer prices what's actually on the drawing — including the geometry an algorithm gives up on.

Algorithmic CNC quoting
  • Price padded for the worst-case tolerance it can't verify
  • "No quote" verdicts on geometry an experienced machinist runs every week
  • Your file forwarded to a shop you've never heard of, at their capacity that week
  • DFM issues surface after tooling or fixturing is already committed
  • A ticket number to argue with if the price looks wrong
The OperGo way
  • Priced against the tolerances, material and finish actually on your drawing
  • Tricky geometry gets a fixturing plan from a person, not an automatic rejection
  • Machined on equipment we run and inspect ourselves
  • Deep, feature-by-feature DFM pass once you accept the quote, ahead of production
  • One engineer owns your part from first quote to repeat order

What we run

Milling, turning and everything between prototype and run.

5-axis milling

Multi-sided geometry cut in a single setup — fewer fixturing errors and tighter true-position tolerances than three or four separate 3-axis ops. The reason a part that touches more than one face still comes off one machine.

3-axis milling

The fast, cost-efficient default for brackets, plates and enclosures — most prismatic parts never need more.

CNC turning & live tooling

Round and stepped parts machined complete — including milled flats, cross-holes and keyways — without a second setup on a second machine.

Prototype to production, unchanged

The same program, tolerances and inspection plan on part one and part ten thousand, so a validated prototype never has to be re-proven for the run.

See it, don't just read it

Rotate a sample part. See what actually drives cost.

Interactive · demo part

What an engineer checks on a part like this.

Rotate the demo part yourself, or pick a constraint below — these are the same checks an engineer runs on every CNC file before it's quoted.

The spec sheet

Tolerances, materials and finishes at a glance.

Spec sheet · CNC machiningin-house
Tolerance±0.1mm standard · as tight as ±0.02mm on the features that need it
Processes3-axis milling · 5-axis milling · CNC turning · live tooling
MaterialsAluminum, stainless & mild steel, ABS, PEEK and other engineering plastics
Surface finishAs-machined standard · smooth-machined · fine-machined for a near-cosmetic surface — before any coating
FinishingAnodizing, powder coating, painting, polishing, tapping & inserts — same quote
Batch sizeFrom a single prototype to an ongoing production run

Full range of finishes and every material grade live on Materials & finishes →

Before you send a file

Check the feasibility of your part.

Interactive · feasibility check

Sanity-check a CNC job before you upload a file.

Material
Tightest tolerance needed
Largest dimension
25
11,00010,000+
Setup complexityLow
No red flags from these inputs — a straightforward CNC job.

A directional read, not a quote — geometry details (pockets, corners, undercuts) move this more than any single input here. Send the part for real numbers →

Picking a process

CNC is the right call — until it isn't.

CNC vs. injection molding →

CNC wins before tooling would pay for itself — validating a design, or a volume in the tens to low thousands. Molding wins once you're past that break-even and need thousands of identical parts at a lower piece price.

CNC vs. 3D printing

3D printing wins for the fastest possible prototype or geometry CNC genuinely can't reach, like internal lattices. CNC wins the moment the part needs to perform — real metal strength, a tolerance a printer can't hold, or a finished surface.

Still not sure? →

Send the part and an engineer will tell you which process fits — or read the DFM guide for the design calls that move cost the most, regardless of process.

CNC machining, answered

What tolerances can OperGo hold on a CNC part?

±0.1mm is our standard tolerance and covers most features without adding cost. We hold tighter tolerances — down to ±0.02mm — on the specific dimensions that actually need it, priced only on those features rather than the whole part.

What’s the minimum order quantity for CNC machining?

One. We quote and machine single prototypes on the same lines and under the same QC as a production run, so a part validated at quantity one doesn’t need to be re-proven when you scale up.

Do you offer 5-axis machining?

Yes — 3-axis milling, 5-axis milling and CNC turning with live tooling, so a part with features on more than one side doesn’t need multiple setups and the fixturing errors that come with them.

Which file formats do you accept for a CNC quote?

STEP is preferred for pricing accuracy; we also accept IGES, STL, SolidWorks and other native CAD formats, plus a 2D PDF drawing for anything with GD&T callouts. No file yet — a sketch or a reference part is enough to start.

How fast can you turn around a CNC quote?

Most quotes come back within 24–48 hours, checked against real tooling by the engineer who’d run the job — not an instant algorithmic estimate. Your quote states a real machining date, not a range.

An instant-quote platform rejected my part as unmachinable. Can you make it?

Often, yes — send it. Algorithmic DFM auto-rejects geometry it can't parse: deep pockets, thin walls, undercuts, tight true-position callouts. Those are exactly the parts our engineers review by hand — within 24–48 hours you get back how we'd fixture and machine it or, if the part genuinely can't be made as drawn, the smallest design change that makes it machinable.

What materials and finishes can you machine?

Aluminum, stainless and mild steel, and engineering plastics like ABS and PEEK as standard, finished with anodizing, powder coating, painting or polishing under the same quote — no separate vendor or lead time to coordinate.

What surface finish do CNC parts come with?

As standard, parts ship as-machined — a clean, functional tool finish with faint tooling marks. For a smoother or near-cosmetic surface we specify smooth- or fine-machining, and any coating (anodizing, bead blasting, powder coat, polish) goes on top of that, all under the same quote. Tell your engineer the surface the part actually needs and it's planned into the program, not chased afterward.

What if CNC isn't the right process for my part?

Then it changes — before you're locked into anything. If your geometry, target price or volume line up better with injection molding, sheet metal or another process, your engineer flags it and requotes under the right one. Opening this page doesn't commit you to this process.

Sustainability

Machining makes chips, not waste.

CNC is a subtractive process — every part starts as solid billet, and what comes off it is swarf, not scrap product. Sorted by alloy instead of mixed, that swarf keeps its full scrap value instead of heading to landfill.

Chips sorted by material, not commingled — aluminum, steel and stainless kept separate at the machine.
A validated, repeatable program means fewer scrapped parts from drift mid-run.

Sourcing recycled billet, or need a documented waste-diversion figure for your own reporting? Flag it to your engineer at quoting — it changes which material lot the job runs against, not the tolerance or the process.

Materials & finishes →

Every grade and finish available for a CNC part, priced under the same quote.

Cut your cost before you quote →

The tolerance and geometry calls that quietly double CNC machining cost.

See all capabilities →

Injection molding, sheet metal, 3D printing and everything else we run in-house.

Materials × process

Materials we run in cnc machining.

Sourced, produced and finished under one quote. Tap a material to see the other processes it runs on — material and process are two axes you combine, not one nested inside the other.

AluminumStainless SteelSteelABSPolycarbonate (PC)Nylon (PA6 / PA66)POM (Acetal / Delrin)PEEKAll materials & finishes →

Ready? Go.

Get a price an engineer will stand behind.

Send one part or your whole BOM. An engineer reviews it with the shop floor and sends back a real price, a real lead time and free DFM notes.

Get my quote →

Free account, no commitment · NDA signed before you upload.