Z Axis Plunging too Deep into part < part zero, tool offsets, turns ratio >

[martyscncgarage]

When you run another program, you have to reset part zero. (Assuming it uses the same tools in the tool library)

[milling]

Thanks Marty- I will make sure I do that. It seems the best measure at least in what I have found is that I get a more consistent result if I shut down CNC12 if I run a differnt job. If I don't it almost seems like part or all of the current job is still in memory? Not sure that makes sense or not?

[tblough]

You shouldn't need to shut down CCN12 when switching jobs, but if you've found a process that works for you that's great!

[Greg]

Hello new here with my first conversion and found your thread because I was having the EXACT same issues as you. Everything seemed to be working fine for a few parts until I crashed a $60 tool straight into some aluminum. After reading through all the pages I started thinking it was just lost motion and slowed down my Z rapids alot and slowed acceleration. I also reset my offsets after and found they were wrong due to lost motion. I ran the same gcode and it worked perfectly. I will do some further testing soon.Good luck

~edit~ I did more testing and the Z axis still falls short of home position only after running a program , machine coordinates say Z 0 when its about -.5

[martyscncgarage]

Make sure you tell the control which tool you are using to set the Z part zero.
Make sure your tool offsets are correct.

[cnckeith]

Hello new here with my first conversion and found your thread because I was having the EXACT same issues as you. Everything seemed to be working fine for a few parts until I crashed a $60 tool straight into some aluminum. After reading through all the pages I started thinking it was just lost motion and slowed down my Z rapids alot and slowed acceleration. I also reset my offsets after and found they were wrong due to lost motion. I ran the same gcode and it worked perfectly. I will do some further testing soon.Good luck

~edit~ I did more testing and the Z axis still falls short of home position only after running a program , machine coordinates say Z 0 when its about -.5

have you confirmed that you have the turns ratio set correctly?

[martyscncgarage]

Hello new here with my first conversion and found your thread because I was having the EXACT same issues as you. Everything seemed to be working fine for a few parts until I crashed a $60 tool straight into some aluminum. After reading through all the pages I started thinking it was just lost motion and slowed down my Z rapids alot and slowed acceleration. I also reset my offsets after and found they were wrong due to lost motion. I ran the same gcode and it worked perfectly. I will do some further testing soon.Good luck

~edit~ I did more testing and the Z axis still falls short of home position only after running a program , machine coordinates say Z 0 when its about -.5

Greg, start a new thread and follow this post: viewtopic.php?f=20&t=383
Good information provided will get you better suggestions for help.
Marty