RE: [CAD_CAM_EDM_DRO] Re: flexible couplings for PCB router - coupling

Hi Jon,

Thanks. On further thought, I think I could set it up on the rotary table.
The saw would be in the spindle, but the spindle would be at a slight angle
to square (calculated to be pitch of the heli). Then one would advance into
the stock, start rotating and moving along the axis of the stock at the
proper rate for the pitch. Stop rotation at the end; then withdraw from the
stock.

Not hard for CNC. About the only way I'd try it with the little Sherline
saw blades. Maybe I'll try it out on some wooden dowel! Good exercise!

Alan KM6VV

> Alan Marconett wrote:
>
> >HI Fred,
> >
> >That's what I thought. How do you make a helical SAW cut? Just a simple
> >shallow angle for the blade? The blade probably wouldn't like it. Hard
> >enough to make a simple clean cut and worry about killing the blade!
> >
> >
> >
> The SAW isn't helical, the slot is (approximately). Maybe you know that.
> The blade runs on the axis of the spindle. The piece of aluminum (or
> other)
> bar stock is passed across it at an angle, and "screwed" through the
> blade.
> If you did this with a shallow cut, it would look like you were cutting
> a thread.
>
> It would at least be theoretically possible to do this with a drill
> motor set up
> on an angle on a lathe toolpost. You would set up the lathe with the
> leadscrew
> engaged but the spindle stopped, start the motor spinning the saw, drive
> the saw
> in with the crossfeed, and then advance the lathe spindle at an
> extremely slow rate,
> making the cut. At the end, you could stop the lathe spindle and
> withdraw the
> saw with the crossfeed.
>
> Jon
>