Last updated 10 August 2026
Barely at all, which is the surprise. A .375 bore anodized to a .0008 total coat wants .3748 / .3768, because only about half the coat sits above the base metal.
This is the case where the two hardest corrections in the job land on one feature. The coating closes the hole rather than opening it, so the bore starts larger. And an anodize call-out states total coat thickness while only about half of it grows outward, so the correction is half what a plating spec of the same number would be.
Get the direction right and the buildup wrong and you are out by a factor of two in the direction that leaves the hole tight. Get the buildup right and the direction wrong and you are out by twice the correction in the direction that scraps it. The reason to compute this rather than reason about it is that both mistakes look like a reasonable answer.
| On the print | .3740 / .3760 in |
|---|---|
| Process | Anodize |
| The feature | diameter, both surfaces in the process |
| Per side | 0.0008 in |
| The dimension moves | smaller at this operation |
| Shift per unit of per-side effect | 2 times |
| Hold before the process | .3748 / .3768 in |
Open this case in the calculator, and change the numbers.
Computed by ctrlPlanner. MIL-STD-870, Federal Screw Thread Specification H28.
This is one characteristic. A real part has forty of them through five operations, and every one needs the same walk when the drawing revises. That is what ctrlPlanner does from a ballooned print.
Open the demo · a print is already loaded, no sign up.