I did a line test to help determine the right settings for the PCB-Gcode. Just some 0805 SMD parts joined by straight traces. The thickest is .05" the thinnest is .01".
A: .007" tool, .005" depth, .005" step size. .005" is too deep, I can feel the "height of the copper and on these little parts, I don't want them to fall off into the trough. Feed was 8ipm. Note the left over whiskers, this tells me the tip is not .007".
B. .003" tool, .003" depth, .003" step. This one is perfect. I did shrink the isolation from .02" to .01 to speed up the run. Feed was 8ipm.
C. .004" tool, .004" step, .004" deep. Reset iso to .02" ran it at 18ipm the whiskers are there like on A, but the .1" line is impressive at that speed.
Also, I set up my indicator (though not very well) to get an idea of runout. I can hear the vibration in the Proxxon at lower speeds, and 11-13K RPM is the sweet spot as was told by the dial indicator. I need to try my Wolfgang spindle I suppose. Just need to make a adapter so it'll fit in the 20mm (.759") holder as it's only 19.01mm (.748").
FWIW,
JAy |