Tight-Tolerance Machining

Sub-thou flatness · True position to a tenth

When the print calls for sub-thou flatness, true position to a tenth, or surface finish a buyer can fingernail-test — you need a shop that doesn't just cut the part, but measures, documents, and proves it.

Send your tight-tol print (612) 851-6772

Tolerance Capability

CRITICAL FEATURES

Linear	±0.0002″
True position	⌀ 0.0005″ MMC
Flatness	0.0003″
Concentricity	0.0005″ TIR
Surface finish	Down to Ra 8 µin
CMM	Zeiss Contura, temp comp

How we hit it

It's not the machine — it's the process.

01
Datum strategyBefore we cut, an engineer reviews GD&T, picks the datum scheme that minimizes accumulated error.
02
ProbingRenishaw work + tool probing on every setup catches drift before it becomes scrap.
03
ClimateThermal-compensated CMM in a controlled inspection room. Parts allowed to soak.
04
Inspection planCritical features mapped to CMM. Non-critical to comparator. Right tool for the feature.
05
DocumentationEvery part, every order: a CMM report, not a callout sheet someone signed off on.

Be honest about what really needs to be tight

Half the cost of a "tight-tolerance" part is in features that didn't actually need to be tight. The cheapest cost-out is loosening the tolerance on non-critical dims and putting the budget where the function lives.

Request a free DFM tolerance review

Got a print other shops won't quote?

Send it. We'll tell you what's achievable, what isn't, and what we'd change to make it cheaper without losing function.

Upload your print (612) 851-6772