I recently received a large collection of twist drills from the wife of a deceased machinist.
Several of the bits have two flats on the shank, at the end of the shank, 180 degrees apart.
I have done some research, and see that some bits have three flats on the shank to get a more secure grip in the chuck
are the two flats along the same lines to get a more secure grip?
or are they for some other purpose?
Thanks
Bob
Several of the bits have two flats on the shank, at the end of the shank, 180 degrees apart.
I have done some research, and see that some bits have three flats on the shank to get a more secure grip in the chuck
are the two flats along the same lines to get a more secure grip?
or are they for some other purpose?
Thanks
Bob