by wefalck » Sun May 18, 2014 4:15 am
Rolled twist drills are normally readily available on that electronic bay down to 0.3 mm. The shaft diameter is the the same as the drill diameter
Watchmkers supply houses (such as Otto Frei, but there are others) carry ground HSS drill bits down to 0.1 mm. Their shaft is either 1 mm (up to 1 mm drill diameter), 1.5 mm (up to 1.5 mm drill diameter) or 2.4 mm (up to 2.4 mm diameter).
Tungsten drills are very brittle and probably not suitable for work in a hand-held pin-vise. Hower, again on the electronic bay you may get used tungsten drills with 3 mm or 3.2 mm shaft and diameters from 0.1 mm to 6.4 mm quite cheaply. In various industries they are replaced routinely before they get dull and then dumped onto the second-hand market. For many modelling purposes they are still adequate.
Rolled twist drills are normally readily available on that electronic bay down to 0.3 mm. The shaft diameter is the the same as the drill diameter
Watchmkers supply houses (such as Otto Frei, but there are others) carry ground HSS drill bits down to 0.1 mm. Their shaft is either 1 mm (up to 1 mm drill diameter), 1.5 mm (up to 1.5 mm drill diameter) or 2.4 mm (up to 2.4 mm diameter).
Tungsten drills are very brittle and probably not suitable for work in a hand-held pin-vise. Hower, again on the electronic bay you may get used tungsten drills with 3 mm or 3.2 mm shaft and diameters from 0.1 mm to 6.4 mm quite cheaply. In various industries they are replaced routinely before they get dull and then dumped onto the second-hand market. For many modelling purposes they are still adequate.