SAFE BIT DRILL SPEED

Aspects such as drill speed and drill pressure are probably the ones that are hardest to get right.There is a different ‘ideal’ speed for each application.One of the problems with determining the ‘ideal’ speed is that with a safe drill bit, the diameter of the cutting surface varies from zero at the tip to say - 3/16” at the edge.Choosing the most suitable speed based on the full diameter of the bit, leaves the center of the safe bit turning at a much reduced speed.The normal chisel edge at the tip of the safe bit is having to extrude metal out of it’s way rather than cut in the way the lip does at the outside edges of the safe bit.Butter Safe Bits feature a unique ‘Negative Rake Angle’ tip design, which helps overcome the problem by reducing the chisel edge almost to a point and producing an extra edge between the point and the normal cutting lip.

There have been studies published which have recommended cutting speeds of 3500 - 7000 rpm!Drilling at these speeds is not only impractical, but would produce so much heat that the tip would quickly burn-up and disintegrate.Speeds at 350 - 700 rpm were used for testing and were found to be quite effective.

DRILL PRESSURE>