Re: sherline motor/speed control wiring

Randy, Tauseef,

Which KB controller is Sherline using? Or what would replace it? I
have an 115v AC/DC 1/5 hp motor on my old Sears/Sherline mill (5000),
and was thinking about replacing it. I'm also thinking about buying a
NEW 5400 mill. Is it a documented standard KB that we can interface
speed control to?

I think Dallas Semiconductor makes "digital pots", these should be
useful!

Alan KM6VV
P.S. Randy, Want to meet me in Escalon next Sat.?



tauseef wrote:

>
> Randy,
> Yes the I1 and I2 do sound tempting. Thank you for the link, I will
> look into it more. I am glad that the timing was good for you. I
> wondered about the wiring for a while and I guess the ZAP! gave me a
> reason hehe. I know a few others are working on getting this spindle
> on/off thing worked out. When it does, hopefully they will let all of
> us know. If and when I do, I will let you guys know how to do it.
>
> Alan you bring up and interesting twist to the whole "spindle on/off
> quest" with speed control. Actually at the KB electronic site under
> the manuel they do say this:
>
> "Voltage Following- All models can be controlled with an ISOLATED
> analog reference voltage (0-7 VDC) in lieu of the main speed
> potentiometer. The voltage is connected to P2(+) and F-. The control
> output voltage will linearly follow the input voltage. The source
> impedance of the input should be 10K ohms or less. The Min and Max
> trimpots are rendered inoperative in the voltage following mode. Use
> auxiliary trimpots for scaling and to limit the control range. If the
> input signal is not isolated, or is a current signal (4-20 mA), the
> KBSI-240D or SI-5 Barrier Terminal Board Signal Isolator must be
> used. It wil allow direct connection to process controllers and
> microprocessors."
>
> later
> tauseef
>
> --- In CAD_CAM_EDM_DRO@y..., Randy Gordon-Gilmore <zephyrus@r...>
> wrote:
> > At 04:25 PM 3/3/01 -0800, Randy Gordon-Gilmore wrote:
> >
> > >"The Inhibit™ circuit (terminals I1 and I2) is provided to
> electronically
> > >disconnect the armature output voltage."
> >
> > I found some information on the Inhibit circuit at
> >
> > http://www.kbelectronics.com/pass/tech/1033.html
> >
> > (I had to register with their site to find that...)
> >
> > Best regards,
> >
> > Randy