Re: Comments on idea for high speed spindle for Bridgeport

Hello,

The newer HF speed control is amazingly good. Smooth control.

Figuring speeds and feeds for small bits is the same as for big'uns.
Chip load per tooth x teeth x rpm = f/r (get chip load from mfr. or
machinery's handbook or similar.)

Hope this helps,

Ballendo

P.S. You can also work from the material cutting speed, but IME using
chip load works better for small cutters...

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "washcomp" <jeff@w...> wrote:
> Makes sense John. I was thinking of regulating the speed with a HF
> router speed control. Are they any good? How do you figure "feeds
> and speeds" on miniature bits?
>
> Thanks,
> Jeff
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "stevenson_engineers"
> <john@s...> wrote:
> > >--- In CAD_CAM_EDM_DRO@yahoogroups.com, "washcomp" <jeff@w...>
> wrote:
> > >I'm
> > > a little concerned that I will not be able to accuately line up
> the
> > > router on the X axis with the BP spindle as the initial
position
> of
> > > the spindle when I insert it is kinda arbitrary. Regards,
> > > Jeff
> >
> > Doesn't matter.
> > I bolt a 400 Hz 24,000 rev 1/4 Hp motor onto the side of my CNC
> mill
> > head for engraving.
> > The new spindle is about 4" off centre. All that matters is that
> you
> > use the new spindle as your zero.
> >
> > John S.