- Joined
- Apr 8, 2013
- Messages
- 1,982
I just saw another video of a guy testing the TIR of a Chinese MT collet chuck in his lathe. The guy's reasoning is bugging me. He first tests his spindle and it had a .002" TIR. Then he mounts the an endmill in an MT collet chuck and it reads .0045" runout so he claims the actual runout the chuck is introducing is .0045" minus the .002" spindle runout for a net of .0025". I don't agree with that. Depending on how the collet chuck is clocked in the spindle couldn't it add OR reduce the net runout of the whole assembly? I believe the actual runout of the end mill in the collet chuck itself in this case can be anywhere from .0025" to .0065" depending on how it lines up with the spindle runout. If I'm all wet please splain this to me.
Last edited: