A locating pin is the sacrificial part on purpose: it’s cheaper to regrind or replace than the fixture body it locates. Hardening to 60 HRC before grinding means the wear happens slowly and predictably over its service life instead of galling the mating bore on day one.
Part
Test Fixture Locating Pin
A hardened, ground dowel that repeatedly locates a body-in-white fixture — its diameter tolerance exists so a thousand fixture cycles wear the pin, not the fixture bore.
Part
Test Fixture Locating Pin
Rev
Rev B
Year
2025
Material
O1 tool steel, hardened
Tightest tolerance
±0.005mm (5 µm) diameter
Lot
24-off, running lot
Lead time
15 days
Route sheet
How this part actually got made.
| Op | Stage | Machine | Tool | Result |
|---|---|---|---|---|
| 01 | Stock | Material stores | — | Saw-cut billet, certificate matched to the traveler. |
| 02 | Turn | Okuma LB3000, 2-axis CNC lathe | CNMG 432 insert, 0.4mm nose radius | Ra ≈ 1.13 µm |
| 03 | Heat treat | Outside process — subcontracted | — | Certificate returned with the lot; hardness re-verified on receipt. |
| 04 | Grind | Studer S31, cylindrical grinder | Ø8mm ball-form CBN wheel | Rz ≈ 2.81 µm |
| 05 | Inspect | Zeiss Contura CMM | — | First-article report against the drawing's GD&T callouts. |
Finish
Specified surface finish.
What the drawing calls out — verified on receipt with a profilometer, not assumed from the tool that made it.
Ra0.20 µm