sploo
Somewhat extinguished member
I have a couple of blank end MT3 arbours from rdgtools, and I've drilled and reamed a 19mm hole out of the 28mm diameter blank end with no problems, but next I needed to drill and tap a hole into the side for a grub screw... and that's going nowhere. It appears that the outer shell of this softened blank end is not soft. I've not seen this before with other blank end arbors I've machined. Is this normal?