Re: CNC: Spindle speed control

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "J. Malte Stoeckhert"
<malte.stoeckhert@m...> wrote:

> Hi there,
>
> After doing some research about CAD/CAM/CNC I have one unresolved
> question remaining:
>
> All of the systems/information I have seen so far seems to

disregard

> spindle speed control via g-code which seems funny to me as the
> spindle speed besides the feed rate is an important factor in
> cutting/turning (I'm still a early beginner in metal cutting).
>
> Is there a feasable and financially reasonable solution (I own a
> Sherline mill and lathe)?
>
> Malte

Malte,

What I have done is to hang a simple digital to analogue converter
onto a parallel port, and use its output to drive the 0-10v input of
a VFD.

I'm running TurboCNC, and as the source code is available, I have
been able to incorporate simple drivers for M03 / M04 / M05 & SXXX
and it works very nicely.

If you go to the TurboCNC user group on Yahoo, I have posted the
circuit diagram and the code in the files section
(schematic_page_2.pdf & vfd.pas)

Regards,

Andrew Mawson
Bromley,
Kent,
UK