Part
Turned shaft collar
A split collar turned from bar, bored and radially clamped. The bore and the clamp screw are the two features that decide whether it holds.
Open the part →DEMO — fictional range. Local brief only, NOT SENT. No personal data is collected or transmitted.
PRECISION MACHINING / FICTIONAL RANGE
Parts that arrive at the tolerance they were drawn to.
KERNWELL is a fictional machining range covering turned collars, milled manifold blocks and precision flanges. Everything on this site exists to show how a machining brief is organised: what is decided before a drawing is issued, what a first article actually confirms, and what a quotation needs in order to be a quotation.
Three parts, three different questions.
A collar, a block and a flange fail for different reasons, so the questions a buyer has to settle are different too. The range is small on purpose: each part carries one decision that the others do not.
Part
Milled manifold block
A block milled from plate with a face pattern of bores and cross-drilled ports. Position between features is the whole specification.
Open the part →Part
Precision flange
A flange with a raised hub and a six-hole bolt circle, turned and drilled in one setup so the bore and the circle share a datum.
Open the part →What is decided before a drawing exists.
Four decisions set everything downstream. They are cheap to change on a call and expensive to change after a first article.
- Intended use
- A static bracket and a moving one can share a material and need entirely different tolerances
- Tolerance
- A tolerance written tighter than the part needs is cost with no consequence
- Process
- A deep pocket and a tight tolerance rarely belong to the same feature
- Volume
- Setup cost is divided by the batch, which is what decides whether a process is viable at all
Why the intended use comes first.
It decides how tight everything else has to be, and it is the one thing a drawing usually arrives without. Two parts can share a material, a finish and a supplier and still need different tolerances because one is loaded and one is not.
What this site cannot tell you.
Whether a part will survive its real load. That is a physical property, established by measuring a physical part against a written specification rather than by reading a page.