Re: [CAD_CAM_EDM_DRO] tram-it

Klutz !! <(;<) (The Devil made me do that)
Henry

----- Original Message -----
From: "Alan Marconett KM6VV" <KM6VV@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, May 03, 2001 10:47 PM
Subject: Re: [CAD_CAM_EDM_DRO] tram-it


> Hi Bill,
>
> You could be right! Must be more analog, so that the arc of light is
> variable, and can be "tweaked". Good thoughts. I think I'd be afraid
> of adjusting the column too much, and running into the table with the
> device!
>
> Alan KM6VV
>
> Bill Phillips wrote:
> >
> > Alan and Jack,
> > You have set a thought going. While working on customer returns of
> > inductive transmission systems I found out that you could use the
> > transmitter module as a very effective proximity detector. It was
possible
> > for instance to measure the thickness of ink on paper. Completely
useless
> > of course but it may be a similar technique is used on the Tram-it.
> > Within the disc may be a coil of some sort driven by an oscillator. As
it
> > rotates over the metal of the table the coil characteristics will be
> > modified. This can be picked up as a variation of amplitude or frequency
> > and fed into some kind of logic which will modulate the LED's colour to
> > suit. The closer the disc to the table the greater the change. Where it
> > goes over the table edge or a slot the effect will be zero and the LED
> > probably goes out.
> > Of course I could be completely wrong. (as usual)
> >
> > Regards
> > Bill Phillips
> >
> > >Hi Jack,
> > >
> > >I suspect reflective opto-switches. The kind used for Dan's tach's.
> > >Several channels, driving LED's, around in a circle. I know, we can
> > >build one!
> > >
> > >I'm still waiting for a Renishaw for my Sherline! Anybody build any?
I
> > >tried some experiments with a small microswitch mounted on a 1/4" rod,
> > >and was able to nudge up to it, and get fair repeatability. Only good
> > >for one axis, 'tho.
> > >
> > >Alan KM6VV
> > >
> > >
> > >jmw@... wrote:
> > >>
> > >> Does anyone know how a Widget called Tram-It works? (I think I've got
> > >> the name right.) Tram-It is supposed to help align the head of Bport
> > >> type mills. The thing is basically a 4"-6" disk about 1/2" thick with
> > >> a shank to mount it in the machine spindle.
> > >>
> > >> You fire up Tram-It, wind the mill to 500 or so RPM and bring the
> > >> device about .050" from the table. The thing lights up around its
> > >> periphery (via multi-color LED's I presume), one color in the highest
> > >> zone and a second color elsewhere. You adjust the head until Tram-It
> > >> glows just a single color all around its edge.
> > >>
> > >> A couple hundred $ is a little pricey when an indicator and bent rod
> > >> work fine, but it's a bit of a head scratcher how the thing works.
> > >>
> > >> Flying .050" above the table, it wouldn't take me long to crash the
> > >> disk. Also I think I'd prefer not to adjust the head when the machine
> > >> is vibrating.
> > >>
> > >> But how does it work?
> > >>
> > >> Thanks in advance.
> > >>
> > >> --Jack
>
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