Just out of interest,the Armeg beaver "nail-proof" bits are specifically designed to work on an impact driver. There ability to cope with hitting a foreign body,is greatly enhanced,with repeated short-blows. High torque,constant rotation would cause the bit to encounter longer duration torque events,and probably shear off.
Right,that's the science out of the way...What i can never understand,is lads will have dozens of fancy bits,and not think to purchase a small diamond hone,with which to fettle them.
The key to ANY bit performing at its' best,is the correct profile to be maintained,on the cutting edges.
I have auger bits from Armegs latest range,going back to Shipwrights Breast-drill longs,from the 1800's. They ALL work best,when sharp.
They also ALL need either sharpening,or re-dressing,from time to time. Diamond hone for the edges,and a 6" triangular saw-set file,for the screw point,if fitted.
The added benefits to this practice,aside from engendering a pride in ones tools and ones work,is less load on the drive device,cleaner holes (giggerty) and reduced break-out.
Listen lads,if your missus can spend an hour,filing her nails when she already has your heart...i'm sure you can give your bits an occasional buff :coolgleamA:
