Drilling big holes without harming yourself
Hmmm. A method that I don't see listed--use a square drive chuck on an
impact wrench. Mine is
a Jacobs 64-J9. Grind the drill for zero rake on the face and have at it.
Used to use this method for
opening up egg shaped mounting holes on hydraulic and air cylinders, and for
taking out shear pin
holes on sprocket drives to the next larger size.
|