Another point.....If these are Tape scales, The biggest issue you will have
is cleanliness. We have for CMM machines, 2 are servo driven and 2 are
manual. If you have tape scales try claning them with denatured alcohol and
a lint free cloth. This will fix most scale issues on this type. The read
heads on these scales must be tuned with a scope in X-Y mode. All of our
CMM's have tape scales.
Dave
----- Original Message -----
From: "Stuart Stevenson" <[EMAIL PROTECTED]>
To: "EMC2-Users-List" <[email protected]>
Sent: Saturday, February 23, 2008 11:35 PM
Subject: [Emc-users] Cordax CMM
> Gentlemen,
> Another project, another question.
> I bought an old Sheffield Cordax manual CMM. This is supposed to
> replace a surface plate and height gages. Our inspectors have
> experience with manual CMM's. They are looking forward to using it
> instead of height gages.
> This was supposed to be a running machine. It was running "after a
> fashion". The DRO always shows fault lights. When the EMC men were
> here we got it functioning. While using it we find one scale will
> count correct sometimes, other times it will only count in one
> direction and other times it counts up when the axis is moved in
> either direction. On another board a trim pot will sometimes short and
> sometimes work correct and sometime open.
> I identify with age problems. Sometimes things work and sometimes
> they don't.
> Needless to say this does not inspire confidence in the machine.
> I replaced the bulbs in the scale read heads. I have a good signal
> into the DRO from each scale.
> Sheffield has the replacement parts BUT the expense is incredible.
> The bulbs, just the little bulbs not the read head, were $160.00 each.
> I haven't priced the amplifier/converter board. I am afraid to. I
> don't think I even want to know.
> SO ----
> The scale feedback to the DRO is four wires with a sin wave on
> each. These are supposed to be 0, 90, 180 and 270 degrees. Is there a
> way to convert the sin wave into a pulse? If I can convert the sin
> wave to a pulse I will hook two of the pulse signals from each axis to
> a soft encoder in EMC2 and have an EMC2 CMM.
> At this time it would be just a DRO. Maybe we could add functions
> later ie. coordinate system rotation, etc...
> All help, comments and suggestions are greatly appreciated.
> thanks
> Stuart
>
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