Cross-drilled hydraulic manifolds fail at the intersection, not along the bore, so the position tolerance in the callout is really a promise about how the ports meet each other rather than about any one hole in isolation. We hold that with a single fixturing for the whole port set — every port drilled from the same datum, in the same setup, so accumulated fixture error can’t stack between them.
Part
Hydraulic Manifold Block
A cross-drilled manifold with eleven intersecting ports — every bore has to land within the position tolerance of every other, or the block leaks at the fitting.
Part
Hydraulic Manifold Block
Rev
Rev F
Year
2026
Material
6061-T6 aluminium
Tightest tolerance
±0.025mm (25 µm) bore-to-bore position
Lot
40-off, running lot
Lead time
18 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 | Face | Haas VF-2, 3-axis vertical mill | Ø12mm ball-nose, 2-flute carbide | Rz ≈ 190.52 µm |
| 03 | Haas VF-2, 3-axis vertical mill | Ø8mm ball-nose, 2-flute carbide | Rz ≈ 127.02 µm | |
| 04 | Drill | Haas VF-2, 3-axis vertical mill | Ø6mm jobber drill, HSCO | — |
| 05 | Thread mill | Haas VF-2, 3-axis vertical mill | M6x1.0 single-point thread mill | — |
| 06 | 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.
Ra1.60 µm