Depth of cut

[r.j.good]

I have a major problem.
Once I start cutting everything is fine for the first half inch, then it starts cutting deeper and deeper, just like the router bit has come loose, if I let it go, having the depth set for .065 it will cut through 3/4 stock then stall.
What is my problem?

[Rickrljones]

What flavor of wood are you trying to cut through. You might want to try putting a backer board on the underside of your carving...

[Jeff_Birt]

This sounds like a problem with the Z-axis encoder (assuming your mpc file is OK). Some machines have had this problem which is usally traced back to a loose ribbon cable and/or a bad Z-axis encoder. I had to replace my Z-motor pack. As I understand it they have solved the mfg issue causing these problems. You can check for the cable problem your self. Search the troubleshooting section there is a recent posts with good pictures.

[The Bard]

check the tension of the Z belt as well.. (the vertical one behind the bit)

if it is loose, you may need to tighten the 4mm allen screw with the tension spring above it.

[r.j.good]

Thanks for the help. The trouble must have been the belt.
Adjusted the tension and all is well once again.

Thanks again.