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CarlosGS / Cyclone-PCB-Factory

Cyclone (Circuit Cloner) is a parametric CNC mill design intended for PCB manufacturing.
https://reprap.org/wiki/Cyclone_PCB_Factory
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3 or 4 linear bearings to support the bed? #2

Closed yOPERO closed 9 years ago

yOPERO commented 11 years ago

Carlos,

The milling bed has currently 4 linear bearings supporting it and as the milling bed will be moving on a plane (y axis), is it not more convenient to have 3 linear bearings which will give more stability in the case of pressure on the bed(drilling holes, Height probing,etc?

cheers. img_0590 1

CarlosGS commented 11 years ago

Hi, I don't see how three points can give more stability in case of pressure. Specifically, I'm thinking of the two corners that are left without support. My belief is that this solution won't scale well: still needs to tested out milling other materials different than FR4 (wich wouldn't be an issue using Z calibration) to see if it performs as well as the four point support.

yOPERO commented 11 years ago

Ok, at later time we can test it and and get real data, I was just rambling on about the old 3 vs 4 legged stool's stability dilemma. :)

http://twentytwowords.com/2011/08/16/a-mathematical-explanation-of-a-3-legged-stools-complete-inability-to-wobble/