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2nd Generation CNC Router Design 32.5” X 14” X 6”
2nd Generation CNC Router Design 32.5” X 14” X 6”
I am working on a second generation CNC router design based on John’s popular JRGO router. The range of motion is 32.5” in the X dimension, 14” in the Y and 6” in the Z. The differences I have incorporated include:
1.) ¾” hardened shafts and roller linear bearings in place of skate bearings
2.) 3/8”-12 Acme precision lead screws in place of threaded rod.
3.) Stiffened the gantry
It is commonly stated in this forum that people will build a first machine, like the JRGO design, to expose themselves to CNC, giving them a platform to learn about the capabilities and limitations of hobby CNC. Then they will move on to a more accurate and capable machine. It is this second machine that I am targeting in this design.
Even though this machine uses higher performance components where required, minimizing cost is a driving requirement. To this end I am looking at utilizing common materials for things like bearing support blocks and lead screw nuts. Attached is a rendering of the proposed machine. Comments are welcome.
Greg
Z axis-More distance between rails
Greg,
Nice design.
If you're going for precision (and stability), then one thing that stands out to me (one who still has yet to complete his FIRST machine) is that you might have room to widen the spacing between your Z axis rails. Your alignment blocks have space between them and the Z axis trolly. The wider these are, the more stability you 'should' have. If you've got the room to widen them (without widening the outer wooden structure of the Z axis itself), then do it. :) You don't want to widen the wooden part because that would narrow your Y axis travel.
Just my 2c worth.
Rance