Just another data point.  We recently purchased a Cyberoptics LSMII for
this purpose.   We looked at and demoed an array of microscope focus based
units and found them to be very subjective between operators.  Once the
lines that the operator overlays on the laser stipe image were adjusted to
approx. the same width as the laser image, repeatability was much better
with the cyberoptics unit.  Having 4 different operators align on the same
gauge block target 10 times apiece, the variation wasn't more than +/- a
couple tens of a mil.






At 11:06 AM 2/10/98 -0600, you wrote:
>Charles Barker@I-O INC
>02/10/98 11:06 AM
>
>Some years ago, there was a mechanical system on the market for measuring
>the height of paste deposited on a pad. The system consisted of a small
>granite block, a needle attached to a Mititoyo measuring device that was
>moved by a thumbscrew and a monocular 'scope set at about a 30 degree angle
>with a back light.
>
>The measurement was taken by moving the needle down until it contacted the
>top of the paste, zeroing out the Mititoyo, then driving the needle down
>until it touched the pad itself. The Mititoyo then read out the thickness
>of the paste.
>
>Does anyone know of such a simple system out there anymore?
>
>TIA
>
>Charlie B.
>
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Bryan Woods
Manufacturing Engineer

Parker Hannifin                 |  Phone: (707)584-2542
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