We have an Albrecht keyless chuck we use in the BP, wonderful item...but...
They use the drilling force to tighten, so larger drill it seems to be okay.
Today we were doing a fair about of 2-56 screws, counterbored for socket head screws.
We usually use the spindle brake and manually tighten the chuck, regardless of size, but today, with so many bit changes to go from tap size to clearance, we forgot on a couple.
Drilling a 0.070 at high speed with very light pressure and shallow pecks just does to put much power in the self-tightening part of the chuck.
We had a couple times where the drill looked good while inthe hole. But when we hit the stop button the slowing down od the spindle with the flywheel effect of the shell of the chuck we had some Newton effect and the jaws come open as yhe did comes loose then gets launched across the shop.
So ALWAYS give the chuck an extra bit, use the spindle brake and give the chuck that extra twist.
Sent from my SM-G781V using Tapatalk
They use the drilling force to tighten, so larger drill it seems to be okay.
Today we were doing a fair about of 2-56 screws, counterbored for socket head screws.
We usually use the spindle brake and manually tighten the chuck, regardless of size, but today, with so many bit changes to go from tap size to clearance, we forgot on a couple.
Drilling a 0.070 at high speed with very light pressure and shallow pecks just does to put much power in the self-tightening part of the chuck.
We had a couple times where the drill looked good while inthe hole. But when we hit the stop button the slowing down od the spindle with the flywheel effect of the shell of the chuck we had some Newton effect and the jaws come open as yhe did comes loose then gets launched across the shop.
So ALWAYS give the chuck an extra bit, use the spindle brake and give the chuck that extra twist.
Sent from my SM-G781V using Tapatalk