- Joined
- Sep 22, 2019
- Messages
- 89
I decided to check the runout after boring out the upper part of the R8 spindle.
The Morse taper arbor PM supplied had at most two ten-thousands runout. (See attached video)
A 1/2" end mill
shaft in the Interstate collet had about one thousands runout.
I clamped a 1X2 board in the vise. Using the Y axis handle I pressed the board hard against the end mill. There was about one thousands deflection.
I am not familiar with typical runout values. These seem pretty good to me.
I have been of the opinion that a sloppy fit between the threaded end of an R8 insert and the spindle would have no adverse affects on performance. I think wedging the insert into the R8 taper with the draw bar is what produces stability, not the upper end of the insert.
The Morse taper arbor PM supplied had at most two ten-thousands runout. (See attached video)
A 1/2" end mill
shaft in the Interstate collet had about one thousands runout.
I clamped a 1X2 board in the vise. Using the Y axis handle I pressed the board hard against the end mill. There was about one thousands deflection.
I am not familiar with typical runout values. These seem pretty good to me.
I have been of the opinion that a sloppy fit between the threaded end of an R8 insert and the spindle would have no adverse affects on performance. I think wedging the insert into the R8 taper with the draw bar is what produces stability, not the upper end of the insert.