Re: [CAD_CAM_EDM_DRO] Re: rotary hand encoder wheels with detent

This may seem a little "Micky Mouse" but some time ago I built a device to
send different keystrokes to the computer. At the time I was using an old
XT with limited resourses, an Dan Cam 3D. I found an old keyboard that
had hard printed cincuits in it along with good ole click keys. I soldered
small wires to all the keys that I thought that I would use and ran one wire
to ground.. Then I ran
all wires to a D-shell connector on the back of the keyboard. From that I
could send keystrokes from what
-ever device I chose. I am now starting to use Mastercam5, which also will
let you use the keyboard to jog. I am considering getting the old keyboard
out and dusting it off and putting it back to work. Hope this is an option
for you.

----- Original Message -----
From: "Alan Marconett KM6VV" <KM6VV@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, February 18, 2002 11:33 AM
Subject: [CAD_CAM_EDM_DRO] Re: rotary hand encoder wheels with detent


> Hi Sean,
>
> I wondered about that. .000125 results in a single step, whereas .0001
> is not. Perhaps .00025 would be better, two 1/2 steps (Sherline).
>
> I see you point about limiting the travel on a full spin, but as I
> currently also set a jog rate and use an incremental encoder, spinning
> the knob fast will "loose" the handwheel steps. Using a DRO chip would
> "save" these steps, something I'm intending to experiment with.
>
> When using the keyboard keys to jog, holding down a key will continue
> the jog. With the encoder and a DRO chip, something similar could be
> done.
>
> I have observed that with larger jog sizes, more jog rate is
> appropriate, and what I'd really like to do is make the rate dependent
> on the distance to be traveled. The rate would have to map at both
> ends. Slow enough at the low end such that single steps could be
> traveled for "touching off", and fast at the larger end so that motion
> would be more continuous.
>
> Alan KM6VV
>
>
> audiomaker2000 wrote:
> >
> > Hi Alan,
> > Too many.
> > Your jog increments should be...
> >
> > .010
> > .001
> > .0005
> > .0001
> >
> > Anything less is silly and anything more is dangerous. You don't want
> > to be able to travel 20 inches with a revolution of your wheel.
> > What is done instead is having a jog "continuous" where you hold an
> > axis jog key and it keeps moving at the set jog feedrate. This allows
> > you to move larger distances without spinning the wheel. Imagine the
> > acceleration of a jog wheel you could spin revolution in .1 seconds
> > when set at .1" per increment (100 increments would equal 10 inches
> > per revolution). That's un-necessary, un-doable by most motors, and
> > dangerous.
> >
> > Sean
> >
> > --- In CAD_CAM_EDM_DRO@y..., Alan Marconett KM6VV <KM6VV@a...> wrote:
> > > Hi Fred,
> > >
> > > I've been trying these step sizes, too many?
> > >
> > > 0.200
> > > 0.100
> > > 0.050
> > > 0.020
> > > 0.010
> > > 0.005
> > > 0.002
> > > 0.001
> > > 0.0005
> > > 0.00025
> > > 0.000125
> > >
> > > Although the Sherline and stepper motion hardware isn't accurate to
> > the
> > > smallest step size, it seems necessary if one wants to creep up to a
> > > surface, to set a zero on a part.
> > > Too many choices? I "rotate" through them with a push of a PB, or
> > as a
> > > menu, with the cursor keys. This list is used by both the pendant
> > and
> > > "cursor key" jogging (pendant and keyboard jog are NOT available at
> > the
> > > same time).
> > >
> > > Currently I am playing with a 256 cpr encoder, because that's what
> > I had
> > > on hand. A Sherline knob pressed into service has 50 divisions,
> > so I'm
> > > thinking that might be a good choice. Now to work in the detents!
> > I
> > > have a "DigiKey" 24 cpr encoder (read by a PIC) on a "radio"
> > project, it
> > > has detents, but there is a fair amount of drag on it, doesn't
> > spin, and
> > > is not as nice as the 256 count encoder. More experimenting
> > required!
> > >
> > > Alan KM6VV
>
>
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