I'm making some custom optical breadboards. Like so:
Specs:
- 8" x 8" x 1/4" cast aluminum tooling plate
- #4-40 tapped holes on a 1/2" grid (distance across outer holes is 7")
- Corner holes are 1/4", for mounting
These are custom-done on my own CNC, so I can easily adjust the hole pattern, do metric M3 instead of 4-40, change the spacing, etc. Asking $125 each for 1/2" grid spacing, $200 for 1/4" spacing.