Robert Strasser
10-08-2007, 3:34 PM
I purchased a boxed set of drill bits (5/64" - 1/2"). The bits are good up to the 3/8" size. But the 8 bits larger than 3/8" have a problem, I think. For these bits, the drill bit shank is reduced to 3/8" to fit 3/8" chucks. But the shanks are not cylindrical. The very end of the shank is larger in diameter than where the shank meets the working end of the bit. For example, the end of the shank is 0.3785 and the other end of the shank is 0.3625. I'm having a hard time chucking them up straight.
Has anyone heard of drill bits made this way on purpose? I've never really measured drill bit shanks before. Never had a reason to.
Has anyone heard of drill bits made this way on purpose? I've never really measured drill bit shanks before. Never had a reason to.