Re: Spindle Speed with the GS2 Drive

[Matt Shaver <mshaver-at-erols.com>]

On Tuesday 25 March 2003 20:04, you wrote:
>      This fall I am going to be involved with a retrofit of a
> Wells-Index knee mill, model 810.  It currently has three axis movement
> with servo drives (Westamp) and encoder (differential) feedback on each
> axis.  The spindle is spun by a 3 horse, 3-phase, 1800 RPM, 220 VAC motor.
>
>      The "iron" is in excellent shape, but the electronic control is by
> Sharnoa that needs to be scrapped.  We are going with the Servo-to-Go
> card, a BDI box, and whatever else it takes for a professional retrofit.

I retrofitted this exact machine with this exact setup a few years ago. It 
works fine and it was very easy to do. Wish I had pictures... Basically, I 
pulled out the Sharnoa control (an S-100 computer for those who know what 
that is) and put a shelf in the cabinet. A PC in a desktop style enclosure 
slid right in and I saved the amps, power supply, and encoders. The I/O was 
done with an Opto22 board controlled through the parallel port on the PC and 
using the existing 24Vdc relay logic on the field wiring side. I also had to 
remove the operator controls mounted on either side of the spindle housing as 
those functions are now controlled through the PC running the EMC, as well as 
the paper tape reader and the operator display on top of the control 
cabinet..

Sorry to say that I didn't do anything with spindle speed control, just 
forward and reverse so I'm not much help. Al least you know you're not the 
first one to do one of these machines...

Matt

P.S. Fred Proctor took some pictures of this machine, maybe he's got 'em 
somewhere, although I don't know if he got any of the inside of the control 
enclosure.

P.P.S. One of the old amps (the Z axis) finally went bad a couple months ago 
and I replaced it with a Servo Dynamics amp which is working well.