This has been an ongoing issue for me and I usually solve it by editing the code.  Today I did a drawing and forgot to edit it, and ended up with a crash.

Say tool #1 is 1” long and tool #2 is 2” long.  When it stops to change to #2 tool, Z goes to the safe Z of tool #1.  Once I change the tool and hit start the Z goes way below the safe height of tool #2 and crashes into the part.  I don’t know if it is a setting I changed in Mach or if I need to edit my post processor.

I am attaching the code I used with the hope that someone may see something I don’t.  I have no issue until it gets to the spotting drill tool #75.

Thanks

Do you have the tools height offsets set correctly in the tool table?
Hood

Yes I double checked everything and it has been an ongoing problem. 

are you cancelling the first tool offset before you call the second. G49

Not sure why its going wrong then as you seem to have the G43H75 there. If you MDI
M6T1
G43H1
Then lower tool 1 down to a surface and zero the DRO then MDI
M6T75
G43H75
 and then lower the spot drill down does it go to the same place for its zero?

Hood

Hood,
If I enter it with MDI it works fine, however when it is running it does not.  I just tried it several times with the same result.  If I add in a G49 like Angel tech suggested it does fix the problem. 

I am not sure why the post possessor does not add that in.  Is there a way to edit the P.P. to add the G49 in?

I figured it out, added the G49 to the P.P. and it is working fine now.

Thanks