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Topics - snakesound

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Hi
I have a 3040 chinese cnc machine , and I make my g Code on Cambam and use a licenced Mach 3 software.
I started cutting 3 mm perspex and managed to get pieces cut with very few noticable problems.

When I started to cut Aluminium it became apparent that the Z axis needed calibrating so after watching a video on YOUtube I set up the Z axis , but I still have problems.

When I start a program on Mach 3 after zeroing the z axis , It soon becomes apparent that each pass is deeper than the G code is stating. the DRO on Mach shows what should be happening but in actual fact the cuts are too deep.
When the DRO shows a depth of -1.8 to 2mm , the actual depth is 3mm. The settings page on Mach 3 confirms that the Z axis is set up correctly. I have had occassions when I get to pass number 15  or so (Each pass is 0.1mm) the tool digs in and drills though the remainder of the 4mm aluminium, breaking the tool in the process.
In hindsight I have always had this problem but as perspex is more forgiving I must have got away with it.
I would appreciate some help as I have run out of ideas.  The G code looks fine , I can see the coordinates being sent out and there is nothing strange that I can see.
The only thing I can say is that when I jog the z axis there appears to be some minor glitches in the sound of the motor which I cant hear on the x and y motors .

thanks Rob

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