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that is definitely backlash, 'something' is loose and shifting when the carriage reverses direction.
GRBL understands only the most basic Gcode, no canned cycles etc, so you need to choose the postprocessor that gives you only G0 G1 G2 G3 codes,...
well now, SketchUcam is very affordable (free) and can control A,B and C, though not for continuous 5 axis motion. however, for each gcode file...
sorry, my bad, you have 1.4 and I have changed stuff since then for the 1.4a release.... (coming soon, beta testing in progress) so yours looks...
the Gcode is good, but you do need to turn on ramping when cutting aluminum. this greatly reduces the stress on the bit. eyeball the angle on...
if you are using SketchUcam, you can save your tool setups as tool profiles and can post the files here for everyone to enjoy. How to do it is in...
the dual belts still need to be at the same tension! and, feedrates. 'slow' does not help really. the tool just rubs, creating heat, until it...
@Mark Carew seems Firefox is failing the upload but IE works ok.
the help front page shows this menu on the right. The item you want is Hole Feature Options'. [ATTACH]
if those are the motors the factory fitted, then you need the power, at least that much, ad they get the power (and speed) from the high input...
that means you are losing steps, reduce accleration and /or max speed for the Z axis, and/or increase the power to the motor. if you are running...
trying again , nope, @Mark Carew I keep getting an error when uploading a sketchup file. use this link instead @CCV...
Hmm, could not attach the file to that post, trying again... nope, will try again just now
No, it is not flat, it is a 3d part. It also has a lot of hidden geometry which is interfering with the Phlatten tool. What I did: copy and paste...
do not disable the motors, ie set $1=255. they will always lose absolute position if you do, unless you set microstepping to '1', which is not...
I do hope they were single flute! anything smaller than 3mm should be single flute, it provides space for the chips to get out, which is...
I calculate 1000 to 2000 mm/min feed speed for a single flute at 20000rpm. flaky? what is flaky about it? prove there is a problem and I will...
way slow! see my other post for the calculations. also, I think some aluminum welded to the bit...... for cutting aluminum from Sketchucam, use...
aluminum is sticky, and has a low melting point. it likes to partially melt and then stick to the bit, forming a very rough new 'cutting edge'....
I think a C-beam will do it just fine for PCB milling. 8x8 leadscrew can give you about , well, lots of resolution (-: 200 step per rev motor,...