Checking tolerances, are the errors in the substrate or machine?

[CuttersCov]

My machine is near completion and I will soon be checking for tolerances of the rails.

I have a dial indicator that I plan to mount to the router mount and run it across the x and y on a piece of particle board.

My question is if, for example, the machine is high on one side by .005 how do I know if my rails need to be adjusted or if the .005 difference is in the particle board?

Or is there a different/better way to measure your tolerances to adjust the rails? They don't bind but that doesn't necessarily mean I can't get them truer.


Thanks,

matt

[solodex2151]

Particle board is not as bad as hardwoods in its expansion and contraction.
My suggestion is don't bother with leveling. If you use the particle board as your spoil board, surface it by taking 10 mils or so off with the router. That should square it to the router axis. Simple, fast, and effective.

Nate