Re: Jog wheel

[John Sheahan <jrsheahan-at-optushome.com.au>]

I have a board based on a pic 16f826 that does this.
I've got the software writen too, might need to be tweaked

probably $US10 worth of parts + the board.
protoel database available, or I can get a panel made at nomainl 
cost if any interest.

john



 On Mon, Jun 03, 2002 at 06:51:21PM -0400, William Scalione wrote:
> 
> 
> >
> > I'm way out of my league here and others are welcome to trash this idea
> but
> > it seems to me that rs232 serial ports are going to be around for a while
> > with linux.  If we write the code to connect a serial port into iosh we
> > should be able to make almost any kind of device we want out there and
> > connect it with a rather simple cable.  USB powered would be easier but we
> > can hang a little connector alongside the db9 to carry power to the
> device.
> 
> US Digital has a quadrature to RS232 adapter, but it's $125.00 each.
> Probably
> just a LS7166 chip, a uart, max232, and some glue logic. If someone can come
> up
> with a circuit, I will hardwire a few together and send them off to you
> software
> experts. They also have a USB model that will do 4 encoders and some digital
> inputs, but it's pricey. Then there is also the Dan Mauch Encoder board that
> would
> work if you are not using it for encoder feedback, but that is ISA bus.
> Probably
> not the best for future expansion.
> 
> 
> > > a single button to step through the axis
> > > select and one to enable. The axis select/enable button would
> > > be a way of ensuring this is the axis I want to move.
> >
> > I like this idea if the enable could be under or alongside one of the
> fingers
> > that you use to hold the device.  One nightmare of mine used a 1" or so
> > diameter tube about 4 inches long.  The wire would exit one end and the
> > handwheel would cover the other end.  Most of the handwheel would be
> covered
> > around the outer edge so that you could thumb it from one side but not run
> > the wheel on your arm or leg.  The top of the wheel would have a
> depression
> > so that you could spin it with one finger of your other hand.  That way
> you
> > could use it as either a traditional pendent, or one hand could hold the
> > cylinder and thumb the wheel slowly while your other hand slid a paper
> that
> > you are using as a gage to touch off a part.
> >
> > I went looking once for small 100 tooth gears that I could use for a
> detent
> > but couldn't find any.  But if we turn out the knobs ourselves from AL we
> > should be able to center drill or mill100 detents around the outer edge of
> > the bottom and use a spring and ball from below.  Writing a g-code program
> to
> > do this would be a good task for CP-1.
> 
> I did the same today, and found some NEMA 17 stepper motors with 3.6 degree
> per step. None with dual shafts to mount an encoder to the back side, and
> probably
> not much detent torque (is that the proper term?) either. But if you took
> the rotor out
> would it have 100 teeth on it?
> 
> 
>