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Old Jan 17, 2013, 08:08 PM
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The wheels touch down FIRST??
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Australia, VIC, Melbourne
Joined Jun 2009
26,620 Posts
Well... I've more or less got my CNC hotwire set up now - I think

It all runs nice and smooth during axis test runs, and I downloaded a neat set of 'Foam Cutter' screens for Mach3. Just have to make the mental adjustment of thinking/talking X/Y and A/B axes instead of X/Y Z/A, but that's ok. In fact, I can better visualize XY & AB anyways

But...

When I do a test cut, the cutter makes a hell of a noise. There's an enormous amount of harmonics and resonance going on

I've set my Mach3 up to run "mm" as the native units instead of inches. The cutter runs 3/8-12 ACME threads, so my 'steps per unit' are 94.49 instead of 2400, with a velocity of 600 (i.e. 600mm/min = 10mm/sec). As I said above, that all runs really sweetly when I jog the motors around the axes at 600mm/min, but when the Feed Rate is set to 200 in the G-Code, the cutter makes horrible noises when moving the axes.

Is this normal?

Do I perhaps need to change the steps per unit, or the axis acceleration?

The NEMA24's on the cutter are rated at 200 steps/revolution - and I'm pretty sure that that's full steps (no half-step, micro-step etc. options).

BJ
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