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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