We've got 2 Yang SMV1000s running Siemens Accramatic 2100, one of which has a really annoying problem with a G84.1 tapping cycle, see the video [ame="http://www.youtube.com/watch?v=KLq-gC74YIQ"]YouTube - Yang Eagle SMV1000 tapping problem[/ame]

The program was just something I made in about 2 mins to try it out, it went something like;

:T11M6
G00Z150
(MSG, M3 Rolltap)
S1500M3
G84.1X0Y0Z-8R0F750
X10
X20
X30
G80
G00Z150
M02

We've changed the encoder and drive belt, switched parts with the other machine (which works fine on exactly the same program), had someone from Siemens looking at it and generally pulled our hair out over it!

Anyone come across something like this? Could it be a setting in the software? Anyone got the full code for a G84.1 canned cycle I could try?