THE KEY TO BUTTER SAFE BIT DESIGN

WHERE BUTTER BITS COME FROM

            When Pro-Lok set out to develop a better safe bit, it was apparent that the best safe bits would come from an improvement of development of the practices of web thinning, worm pattern point, crankshaft drill point or split point grinding.  All of these techniques have been used in general bit engineering for decades.  In the past, however, these techniques have been used primarily on larger drills which were manufactured entirely from carbon or high speed steels.  The application of these techniques to bits with Tungsten Carbide tips has been rare.

THE KEY TO THE DESIGN

            Initial testing was performed using hard sandwich metals such as Maxalloy, solid High Speed Steel, and Hard Chrome Steel with a hardness of Rockwell 66C.  After this testing, a particular tip style was chosen.  We then explored various drill angles and sharpening methods.  Further tests were done to determine which of the drill bit tip configurations was most effective over the widest range of applications.

            The key to Pro-Lok’s safe bits success is the special tip design.  This tip uses a unique negative rake angle and a shortened chisel edge that increases it’s effectiveness and reduces tip failure.  The results of all of this testing and design are PRO-LOK®’s Butter Bits, which will benefit the locksmith who encounters hardplate while drilling safes.