I've started assembling the bits and pieces to make a CNC router table. My mini mill is nice and does a good job, but I want to rough out some larger stuff from time to time. My problem is figuring out how to measure and mark my holes with what I have for the larger pieces to make the frame of the new machine. My mill (with some custom mods) has a working range of about 6 x
11 x 6. I'm planning a CNC router with a range of about 20 x 20 x 4-6. I figured machined and braced aluminum plate would make up most of the pieces, but I'm having some difficulty figuring out how to get my precision distances between screw holes on the longer dimensions. I'll probably go with a fence and stop configuration and make my primaries equal distance from each corner. Is there is a better way?Precision length and square is also a trick I am trying to figure out for the cross pieces. Leave them semi loose & just cut small(er) squaring braces maybe?
I could probably cut upto 5 x 8 braces accurately enough with no problems.
The table frame is planned to be an open configuration with threaded holes for semi quick changes of table surfaces. Surplus t-slot table pieces most of the time, with a couple precut MDF surfaces when I need to get savage with a work piece (which is really what this machine is planned for).