Re: Accuracy of CNC Mill - boring head

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Les Newell <lesnewell@h...>
wrote:

> One trick I used to bore a parallel hole was to use a single point
> boring tool held in a collet chuck. The tool was moved in a shallow
> spiral to bore the hole. With this technique the tool loading is

the

> same all the way down so you don't end up with a tapered hole. The
> finish was pretty good and the hole was within about 0.0004

diameter +

> ovality. It was quite slow and I needed to creep up on the finished
> diameter, taking a number of cuts to reach the diameter I wanted.
>
> I really must make an adapter to fit my boring head on the CNC...
>
> Les

Les,

if you can a fly cutter, you can make one with a screw in the back to
advance the bit.

That way, your work can go much faster and more accuratey.

Dave