Re: [CAD_CAM_EDM_DRO] Re: Digitizers, Renishaw

----- Original Message -----
From: "Smoke" <Smoke@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: 05 January 2001 05:11
Subject: Re: [CAD_CAM_EDM_DRO] Re: Digitizers, Renishaw


> I think technically you can't "legally" make them for your own use if they
> are patented. One of you leagl begals can correct me if I'm wrong.
>
> I'll have to check on the math...maybe tomorrow when I get some time.
Right
> now it's time to take a break!
>
> I'd still like to see a diagram showing how those balls are connected into
> the electric circuit.
>
> Smoke
> -----Original Message-----
> From: Alan Marconett KM6VV <KM6VV@...>
> To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
> Date: Thursday, January 04, 2001 5:49 PM
> Subject: [CAD_CAM_EDM_DRO] Re: Digitizers, Renishaw
>
>
> >Gordon,
> >
> >I would think the "star" has an insulating layer (pcb), with the "tips"
> >of the star metal for contacts. The three "pairs" of balls are wired in
> >series. That should do it, but 6 4mm balls on a 30mm ring circle don't
> >have 2mm spacing (is my math ok?), so we'll have to work on that. a foam
> >"spring" (non conductive) presses on the top of the star.
> >
> >Patented? Probably so. But as I understand it, we can make a model of
> >it for our own use. We just couldn't SELL them without a license
> >(someone can correct me if I'm wrong).
> >
> >This would be good for the "auto origin" hardware we were talking about
> >also!
> >
> >DEFIANTLY not 1000's of $$ to make!
> >
> >Alan KM6VV
> >
> >Smoke wrote:
> >>
> >> The only thing I can't visualize from the description Peter provided,
is
> how
> >> the actual electrical circuit is constructed.
> >>
> >> A skecth would be real helpful here. I think this system could be
built
> for
> >> a whole lot less than $1000. Is it patented?
> >>
> >> Smoke
> >>
> >> >That's just the kind of information we're looking for! And it doesn't
> >> >sound too hard to make! It would be useful to get a better idea what
> >> >the "star" looks like, but I just drew the balls and star up in
Vector,
> >> >and with a few tries, we should be able to get a star that works (good
> >> >contact angles). Pictures would help! Do you have any? Also, do you
> >> >have a URL for CNCDIGIT?
> >> >
> >> >Thanks for the contribution!
> >> >
> >> >Alan KM6VV
> >> >
> >> >
> >> >
> >> >PMeinhard@... wrote:
> >> >>
> >> >> Hi
> >> >> I´m digitizing on a little stepper-driven mill using a Renishaw.
(got
> a
> >> >> broken one from the company I worke for and repaird it). The
> innerparts a
> >> >> quite simple and there ist no need for high accuracy . So I think
it´s
> no
> >> big
> >> >> thing to built one. Basic thing: The Probing Arm has to be able to
> move
> >> in
> >> >> every direction to avoid breaking . They manage it that way: 6
little
> >> >> Steel-ball (4mm) are fixed in a circle of 30mm diameter. always two
> with
> >> gap
> >> >> of 2mm between them , half buried in electric isolating material.
on
> >> them
> >> >> lies a 3-arm-Star of 4mm matrial making an electrical connection
while
> it
> >> is
> >> >> pressed with a soft spring on them . This is now forming an
> electrical
> >> >> circuit . Lifting an arm of the star would break the circuit. In the
> >> center
> >> >> of the star ist an arm leading straight down through a much bigger
> hole
> >> in
> >> >> the center of the isolating material ,60mm long with a little ball
on
> >> the
> >> >> end. The star is always centering itself, drawing the ball in each
> >> direktion
> >> >> makes one star-arm lift off the balls and breaking the circuit. And
> that
> >> >> simple thing costs about 1000$- but the idea is great.
> >> >> The accuracy is about 0.005 mm.
> >> >> ( the dimensions are as kept them in my mind and might vary a
little)
> >> >> The Software I use is simple but good, CNCDIGIT. cost about 150$( as
> far
> >> as I
> >> >> remember) remeber
> >> >> Regards
> >> >> Peter
> >> >
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> >
> >Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
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> >
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>
>
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>
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