Rob, I believe what you're referring to is a cutting tool arm. This is an arbor with an "arm" attached that holds a lathe-type cutting tool on the end. The arbor serves to hold the drill bit and also allows the "arm" to be adjusted in radius to permit differing size holes to be cut. I would think you would need to use a drill press with this configuration because it would be so difficult to keep the drill bit standing perpendicular to the stock being cut to ensure a perfectly round hole. And even with a drill press a lot of care is needed to make sure only an even and equal amount of stock is being removed with each revolution of this set up.
I have one of these and as you bore down with the drill press extreme care and delicacy must be in play. A much easier way to cut a 6" diameter hole is to buy or rent a 6" hole saw -- but these are expensive. I bought a Vermont American 6" hole saw and it cost over $40.00. ---------------- Bill Gallik E-Mail: [EMAIL PROTECTED] - "Nothing changes your opinion of a friend so surely as success - yours or his." - Franklin P. Jones
