Losing steps

[Neale]

I'm wondering how complex your first "3D" carvings were? There is a not-uncommon problem where the polarity of the "direction" pulse is reversed. The effect is to lose one step every time there is a direction change on that axis. If there aren't many direction changes it might not show at all but where there are many changes you see exactly this effect. With a commercial machine this should all be set up correctly - but I've met one Chinese machine where the target for a proximity switch was a broken tap. And it would have worked fine except that it hadn't been adjusted correctly even though it did have a correctly fitted locknut! So you can't take anything for granted until proven. Slipping coupler or similar has to be the first place to look - mechanical issues are the most likely if it was working fine - but the dir signal polarity thing is not impossible and very easy to fix.

But if this is a repeat of a carving that has already worked fine a couple of times, then forget I said anything!

[JAZZCNC]

Was the first carving program also 3D or was it 2D? Becuase 2D worked fine for me, but not XYX movements at the same time.

I'm wondering how complex your first "3D" carvings were?

But if this is a repeat of a carving that has already worked fine a couple of times, then forget I said anything!

Look at the picture he posted up you can clearly see it's 2.5D so it's lots of Z moves. I think it's probably pushing the machine too far regards feeds n speeds. If it's not slippage.

[Edendale]

When I stripped it down it was sticking at the bottom of travel on Z axis, I lowed the spindle so as to miss out the bottom of screw, I try and do it slower and see if that works ��