You have a CAD model. SpecBuildr asks a short set of plain-English questions and turns it into a complete machining specification a shop can quote — with tolerances called out where they matter and nowhere they don't.
A shop will machine exactly what your drawing says — including the mistakes. Over-tolerance everything and the quote balloons; under-tolerance the one bore that matters and you get a useless part.
The skill isn't running the mill — it's knowing which dimensions are critical, how to call out finishes and threads, and what tolerances actually cost. SpecBuildr asks those questions in plain language and turns your answers into a clean spec, so the shop quotes what you meant, not what it guessed.
A machinable spec comes down to six things. Here's what each means in plain terms — the interview pulls them from the part you already modeled.
What it is and how many you need.
In plain terms: one prototype and a hundred parts get made differently.
The stock material and whether it's milled, turned, or sheet-metal.
In plain terms: what it's cut from, and how.
The envelope and the features — pockets, bores, threads, bends.
In plain terms: how big, and what's on it.
Which few dimensions must be tight, and how tight.
In plain terms: where precision costs money — spend it only where it matters.
Surface finish, coatings or anodize, and thread callouts.
In plain terms: how it looks and how it fastens.
What it mates to and where it operates.
In plain terms: fit, load, and conditions.
You tell the tool which fits and features actually matter; it applies sensible general tolerances (ISO 2768-style) everywhere else and calls out the critical dimensions tightly — so you're not paying for precision you don't need, or missing the one bore that does.
A complete, downloadable machining specification: part and quantity, material and process, geometry, critical tolerances, finish and threads, assembly, and environment — formatted so a shop can quote it directly.
It's generated from your answers and reviewed for major physics and manufacturability violations — it won't ask a shop for something un-machinable. Treat it as a strong, quote-ready starting point, not a substitute for the shop's review.
The tool is free to use and needs no account. You keep the spec.
Five minutes of plain questions. A shop-ready specification at the end.
Start your part spec →