Drill bit sharpener Model 148
with hard metal sharpening blade

Drill bit sharpener Model 148 for manual operation
For re-sharpening paper drill bits from 3.0 to 20.0 mm Ø.

Accessory
1 hand crank for drill bits from 3.0 - 8.5 mm Ø (shaft Ø 11 mm)
1 hand crank for drill bits from 9.0 - 14.5 mm Ø (shaft Ø 16 mm)
1 hand crank for drill bits from 15.0 - 20.0 mm Ø (shaft Ø 24 mm)

A guide sleeve is required for each diameter for clamping the drill bits.  The drill bit that is clamped in the hand crank and clamping sleeve is precisely centred by the guide sleeve.
Upon turning the handle the cutting edges of the clamped paper drill bit are sharpened with a widia sharpening blade.