I have a number of hand crank post drills and would like to get some proper flat sided drill bits.
Straight shank drill bits.Special drill bits, called 'straight shank' bits, were made specifically for post drills. These drill bits were made in many sizes, but all had common shank sizes including 1/2-inch diameter, 5/8-inch diameter, and 41/64-inch diameter. Straight shank drill bits were round in cross section with a flat machined on one side of the shank. The straight shank drill bit was never truly centered in the drill chuck (due to the required manufacturing tolerances between the drill shanks and the chucks) and therefore some drill wobble or runout was always to be expected. These drills were made for simple manufacturing and repairs in farm shops and small home workshops, where a great amount of accuracy was not necessary. The drills are of different sizes but the shanks are all the same size
The chuck on a post drill is a simple hole ½ -inch diameter, ⅝ -inch diameter, and 41/64 -inch diameter, there is a bolt that goes in the side of the hole and clamps down on the flat on the drill shank.
If anyone has any flatsided bits especially the reduced size ones and are willing to part with them please contact me.
Quote:
Straight shank drill bits.Special drill bits, called 'straight shank' bits, were made specifically for post drills. These drill bits were made in many sizes, but all had common shank sizes including 1/2-inch diameter, 5/8-inch diameter, and 41/64-inch diameter. Straight shank drill bits were round in cross section with a flat machined on one side of the shank. The straight shank drill bit was never truly centered in the drill chuck (due to the required manufacturing tolerances between the drill shanks and the chucks) and therefore some drill wobble or runout was always to be expected. These drills were made for simple manufacturing and repairs in farm shops and small home workshops, where a great amount of accuracy was not necessary. The drills are of different sizes but the shanks are all the same size
The chuck on a post drill is a simple hole ½ -inch diameter, ⅝ -inch diameter, and 41/64 -inch diameter, there is a bolt that goes in the side of the hole and clamps down on the flat on the drill shank.
If anyone has any flatsided bits especially the reduced size ones and are willing to part with them please contact me.
0 commentaires:
Enregistrer un commentaire