Sorry, your answer was a little contradictory, you said you could turn the THC on or off whenever you liked, but also said it would only work smoothly at certain points I.e. When not in CV.
Better to have said you can only turn it on/off at these points without upsetting motion, it's not the same as being able to do it whenever you want
![Smiley :)](https://www.machsupport.com/forum/Smileys/default/smiley.gif)
As for the code being three arcs, it is something to do with sheetcam, les newel over there is looking into now as he was baffled too,.
I have found that my machine is less impressed with holes sub 20mm but also know now it is connected with acceleration and CV so I will be going back to the basics next week and retuning the axes from scratch to see if I can get her singing a better tune, then I can forget about flipping the THC off and on.
Anyway, my foot is intact and I've learnt a little more, as always thanks for your help, it really is appreciated.