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
DocumentationCMM reports, ballooned inspection data, and FAI packages are delivered to the drawing, quality plan, and PO.

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 scoped 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

Planning the drawing? Read our CNC tolerance and inspection guide.