I made this sidelock collet holder to take slot drills with shanks up to 32mm/1.1/4” diameter with a No. 3 Morse taper so I could use it in the tailstock of the lathe.
After drilling a blind hole which needs to have a flat bottom, this tool works well to take the remaining material the drill point has left. I find this a lot quicker than grinding a flat bottom drill or trying to use a boring tool to take this excess material out.
This is handy when several components need to be machined as a large amount of material can be removed ready for finish boring.
metric sidelock collets with ring to identify
imperial sidelock collets
two holes to push sidelock collets out from main housing
The Home Engineer