Re: [CAD_CAM_EDM_DRO] Digest Number 1905

Thanks, I beleive the 2nd is the one I was thinking about.
I got way behind on reading the list and lost track of its progress.
All the best in the new year and thanks for all the great answers you and
the other members provide here.

----- Original Message -----
From: <CAD_CAM_EDM_DRO@yahoogroups.com>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, December 30, 2001 2:39 AM
Subject: [CAD_CAM_EDM_DRO] Digest Number 1905


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> There are 3 messages in this issue.
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> Topics in this digest:
>
> 1. Jon, you finish that neat board?
> From: David Queen <daque@...>
> 2. Re: Jon, you finish that neat board?
> From: Jon Elson <elson@...>
> 3. Re: Re: CNC Etch-A-Sketch, EggBot
> From: Alan Marconett KM6VV <KM6VV@...>
>
>
> ________________________________________________________________________
> ________________________________________________________________________
>
> Message: 1
> Date: Sun, 30 Dec 2001 00:44:29 -0600
> From: David Queen <daque@...>
> Subject: Jon, you finish that neat board?
>
> Jon, if I remember right was working on a board to do something with
servo,stepper, quad encoder feed back.
>
> How's it comming?
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ________________________________________________________________________
> ________________________________________________________________________
>
> Message: 2
> Date: Sun, 30 Dec 2001 07:22:23 +0000
> From: Jon Elson <elson@...>
> Subject: Re: Jon, you finish that neat board?
>
> David Queen wrote:
>
> > Jon, if I remember right was working on a board to do something with
servo,stepper, quad encoder feed back.
> >
> > How's it comming?
>
> I'm not sure which one you are referring to. I have sent out the PC board
> for the digital I/O for the PPMC board set to be manufactured. I will get
them
> back in a few days and build one to check. Then, the complete set of
> encoder counter, servo DAC and digital I/O will be complete.
>
> I prototyped a stepper rate generator for the NAMES show, and haven't
> had much time to do more with it since. I plan on designing a board to
have
> encoder counters and stepper rate generators for 4 motors, plus digital
> I/O, all on one board. I will wait until the Digital I/O boards are
tested, so
> any errors I find there will not also get into the everything on one board
> unit.
>
> Jon
>
>
>
> ________________________________________________________________________
> ________________________________________________________________________
>
> Message: 3
> Date: Sun, 30 Dec 2001 00:04:10 -0800
> From: Alan Marconett KM6VV <KM6VV@...>
> Subject: Re: Re: CNC Etch-A-Sketch, EggBot
>
> Hi Gordon,
>
> I your axis could drive a pot. Connect the pot as a voltage divider,
> and digitize the voltage. Might be simpler to just use a third axis.
> Then there would be no trig calcs.
>
> Compliant? I just mean a pen mounted in a mount with a little give.
> Spring "tracking" pressure. Too stiff a pen, and you'd wipe out the
> egg!
>
> Alan KM6VV
>
>
> Smoke wrote:
> >
> > What I'm saying here is the probe would look like a flat needle with a
round
> > pin thru it at some point. this pin would be a rotary axis (like an
axle).
> > The probe end would then rotate about this point (axle). The opposite
end
> > of the probe would have some sort of measuring device for measuring the
> > angular deviation. We built a similar mechanical gadget at school for
> > measuring shotgun bores.
> >
> > Calculations would only require using be standard trig functions in a
single
> > plane.
> >
> > The unit would digitize along a specified length, shift a specified
amount
> > in the Y direction and repeat as many times as required until the entire
> > specified area was digitized. This is pretty much exactly what the
> > digitizer on the MAXNC does....except I have no idea how the innards of
it
> > functions.
> >
> > IMO attempting to build a radial device that would measure two angles at
> > ones would be a lot more than what's required.
> >
> > I never heard of a "compliant" pen before. What the heck is that?
> >
> > The only "compliant" pens I have are manual ones that haven't run out of
ink
> > yet. :)
> >
> > Smoke
> >
> > > Hi Gordon,
> > A "compliant" pen mount
> > > could also "draw" on the egg.
> >
> > > I didn't ketch how you were going to "sense" on the probe's pivot.
> > > Deviation on a probe tip would be simple trig calculation from the
angle
> > > that is sensed. Radial angle of the 'Z' axis would be a little
> > > different approach!
> > > > Alan KM6VV
> > >
> > >
> >
>
>
>
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