Just a quick update on this machine. I bought a Bridgeport mill, which I am retrofitting with the huge servos previously slated for my CNC router. Actually, I just bought a
second Bridgeport and will be retrofitting that one too.
These two Bridgeport mills will now handle all my parts requiring high precision, power, rigidity and to cut any metal harder than aluminum..
http://www.cnczone.com/forums/showthread.php?t=13821
So there's a bit of a scope change on this project. I am going to relax my tolerances and limit this machine to cutting primarily wood, foam, plastic, and occasionally sheetmetal. I'll aim for high speed, but no longer need to have the frame perfectly straight and level.
New spec:
-750 IPM
-Repeatability of 0.002"
-Accuracy of 0.005" per foot
-Cut Wood and Plastic within 10" Z height
-Cut Foam within 30" Z height
-4th axis is now a must
-Welded frame is no longer a requirement. The frame can be bolted together for final alignment.
-Tool changer (pick-n-place style) is now back in the plans
-Will be movable, on metal casters. This was not an option back when I wanted this machine to do everything, including high accuracy.
-2HP servos are gone. (the Bridgeport gets them). Instead, I'll use 1kw Sanyo Denki motors:
http://www.cnczone.com/forums/showthread.php?t=13909
So in general terms, the Bridgeport mills are for high-precision metal (within 12" x 18"). The router is for wood and foam with a larger cutting area and faster movement.