Not sure this is the right forum...

I need to build a custom CNC machine that has 16 feet of travel on one axis. I'll be using linear rails on this axis. How do I grind the bed that the linear rails are bolted to so that the bed is true ? There is no machine near me that could grind or cut a bed that long.

Is there such a thing as a laser controlled bed grinder ? Something that you bolt to both ends of a work piece and a laser guides a cutting tool up and down such that grinds a perfectly flat work piece ?

How do machine tool companies grind beds on machines larger than what they have ?

Thanks