Re: [CAD_CAM_EDM_DRO] First Post (and a question re using a plotter as a power feed)

Thanks for the quick comeback Alan.

First, I had no idea that all the posts would be circulated as
part of a mailing list and was quite amazed to find these
eight or so messages all in my trash. (I have a filter operating to
dump everything without my name overboard) I will have to fix
that.

The steppers are 3.8 amp at 1.4 volt and have 53 oz in hold.
I realize that they are quite light but to start with I
think It would please me to see if I could just get something going.
The steppers, flat out, are rotating at about 150 rpm and the
lead screw on the lathe needs about 30 rpm to provide a reasonable
feed, So,,, with a reduction of about (1/4) and the change gears
removed I kind of think that there might be enough beef there to see
how the whole thing would work.

I gather from your assessment as being analog that there is little hope
of using these drivers as part of a computer driven system.

OK then will have to look at a plan B no matter what though I do think
that the joystick control would be quite desirable for
manual turning.

Bill Darby (TKS again)



Alan Marconett KM6VV wrote:

>
> Hi William,
>
> You have a Houston Instrument Plotter, as I understand. Is it analog
> input? I haven't seen one of them for probably 22 years. Or perhaps
> does it have an RS-232 serial interface? That would probably be
> better. Then computer control consists of sending a "plot file" (not
> HPGL :>( ). I'd seriously doubt if the steppers had enough power
> (torque) to run a Myford 7" (lathe?). What stepper motors do you see?
>
> Alan
>
> William Darby wrote:
> >......cut
> > I would like to lead off my first post with a question about this
> > Houston plotter that I have just dismantled to see if I can power
> > feed
> > the X and Z axis of my little Myford Super Seven with the steppers.
> >
> > Right now it will operate on local and allow the use of the joystick
> > to provide speed, direction and selection of axis plus a scaling
> > switch which provides for the selection of four distinct speed
> > ranges.
> >
> > If I can select a gearing range that will provide enough power to
> > move
> > the existing gear train at a reasonable speed I would be quite
> > pleased
> > (I think it is quite doable with what I have)
> >
> > What I would really like to do, however, is to be able to select
> > remote and control the steppers from a computer. .
> >
> > I am currently trying to locate the proper plotter drivers and a
> > round, 15 pin plotter cable connector to fit the plotter.
> >
> > Any and all assistance would be appreciated.
> >
> > Bill Darby
>
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