Hi Tom -

Thanks for the fast reply. I really appreciate it. I'm glad you brought the "Exec/wait/sync" option up because I did not try it or think to try it until I was writing this post. Also am glad for the explanation as the manual was a bit vague on what was being re synced but now it's pretty clear. This sounds like this could be the issue as the M Code moves the Y and Z axis around a bit. However it's odd that the first tool change doesn't create a discontinuity but the second one does. Anyways I will give this a shot tomorrow and report back.

Thanks,
Tom