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However on no account should this backing off be done when drilling the pinkish 'drawn bronze' - this really work hardens and gets hot extremely quickly and can seize a drill to the extent it's virtually withdraw-able. Reaming can be just as fraught especially if a deep hole. Drills should be very sharp, preferably freshly ground, and the hole opened up in small stages rather than just a pilot and opening up to size with this material. If like me you have no flood coolant the action of seizing is extremely quick and even with it it can happen if a deep hole. Again, because of this characteristic rather than reaming I would finish by boring if possible. Regards - Ramon
Hi, I have sometimes found drilling various "brasses' difficult with grabbing etc etc but put it down to " a bad workman blames his tools" !! Now i can say " A good workman blames his tool suppliers for not making the correct type of drills for specifically drilling various type of brasses without mishap" !!!! So how does the Industry cope ?? !!
I then dubbed the same drill like what is shown in Clickspring video. Nothing else changed. Same spot drill, same speed & feed. And the difference was like night & day. It just walked into the material like it was a completely different alloy. I felt like a small miracle had occurred. So I dedicated some larger progressive drills to this dubbing treatment & I am going to get a set of reasonably priced HSS, dub them all & leave them reserved for this type of material.