10-18-2014, 07:20 PM
Ed,
I think it will be fine, a .25" spacer (to space the workpiece up) will probably do. Just have to watch the drill points as well.
The main trouble you will have is drilling a large hole - that's going to cause all the vibrations, so you may not be able to drill a large hole as you first thought. Keep the drill speed slow and some cutting fluid. On drills past .5" dia. there will always be some vibration when you first start drilling because you are drilling on a round/ curved surface and not a flat one. Slow, slow and slow. Make sure all the beds are "locked" are put some "drag" on the Z axis.
DaveH
I think it will be fine, a .25" spacer (to space the workpiece up) will probably do. Just have to watch the drill points as well.
The main trouble you will have is drilling a large hole - that's going to cause all the vibrations, so you may not be able to drill a large hole as you first thought. Keep the drill speed slow and some cutting fluid. On drills past .5" dia. there will always be some vibration when you first start drilling because you are drilling on a round/ curved surface and not a flat one. Slow, slow and slow. Make sure all the beds are "locked" are put some "drag" on the Z axis.
DaveH