CNC Swiss Drills

[swissdodger]

Does anyone know of a vender that sells/makes drills, for example, ER-16 collets that have a 3/8 shank with a drill size of say .450 or .500? or am I resigned to spinning down the shanks in my tool room? My machines are Star SR-20, SR-32J, and SB-16D CNC Swiss screw machines.

[txcncman]

You did not say what make and model of machine you have. We had tool blocks that would handle up to 1" diameter on a Hardinge CHNC 2. We would regularly drill 13/16" using a split bushing to hold in the 1" tool block.

[DCogswell]

You may want to look at insert drills, some of these have smaller shanks.

Also, consider using an insert drill where the shank is ground to 22mm for the T11-T14 tool positions on the SR20R's

[DCogswell]

For the yellow Sr20's, you can get ER25 or ER32 holders that have 22mm shanks. I did this on my SR20.