x,y and z axis problems on 3040T

[zxrjohn14]

Awesome idea Key.
This is the exact machine I have Look at this on eBay http://www.ebay.co.uk/itm/282545167242
I bought it from a guy who didn't manage to use it so was brand new.
It seems weird with mine as when the first plunge is cut, it's perfect but the more plunges it does, the further it creeps north East.
I'm going to try your settings for it though and see what it does.
Edit:
I've ordered the Kress 1050 which should be at home when I get back

[Neale]

One slightly odd thing I see in your settings. You appear to have "active low" selected for step and direction on all axes. That's fine for direction - change this and the machine reverses direction on that axis. However, "active low" for the step signal is unusual for the usual breakout boards/stepper drivers. The effect is that everything seems to work fine, but each time the machine changes direction on that axis you lose one step. Enough direction changes and the axis gradually seems to drift in one direction, fairly repeatably. Your test pieces don't seem to have that many direction changes compared with the overall error but as it's such an easy thing to change (and change back if it makes no difference) you might like to try it. I had this problem on the Z axis on my own machine; didn't notice a problem for simple profiling constant-depth cuts but when I started some complex 3D cutting, the cut depth gradually increased.

(Misread post - Kev's post says "dir active low", not "step". But worth checking that step is active high anyway.)