strange self changing z axis value

[Crabbyadam2002]

im having a problem with my z axis changing its value....im cutting a guitar body, my wood is 1.75" high....the first cut is at 1.65" so it drops .1 and cuts, goes through the parameter and then goes to cut the second sweep around.  it resets itself at 1.85 evertime, however 1.85 seems to get further and further away from its last z position.  so it will not cut any deeper bc it gets further away everytime.  not sure why.   help   phillip

[BR549]

A look at the Gcode may tell the story, can you post your file so we can test it?

Just a thought(;-) TP

[Crabbyadam2002]

i can send it to you.  i tried to put it on this message, just too big.  unless there is another way

[Tweakie.CNC]

Have you tried Zipp'ing the file to reduce the size ?

Then use the Additional Options below to post the file.

Tweakie.

[BR549]

Does it do this with ALL files or just this one?
(;-) TP

[HimyKabibble]

im having a problem with my z axis changing its value....im cutting a guitar body, my wood is 1.75" high....the first cut is at 1.65" so it drops .1 and cuts, goes through the parameter and then goes to cut the second sweep around.  it resets itself at 1.85 evertime, however 1.85 seems to get further and further away from its last z position.  so it will not cut any deeper bc it gets further away everytime.  not sure why.   help   phillip

Sounds like your Z axis is losing steps when raising the head....  Try reducing Z velocity and acceleration by half, and see if the problem goes away.  If it does, then you need to either operate at slower velocity/acceleration, or beef up the drive (larger motor, better driver, higher voltage, etc.).

Regards,
Ray L.