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Goodbye, older friend.....


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This one is even older than Norbert's old friend. Installed 1985, originally running Zeiss "Comet" software (an Americanized version of UMESS 200 I think) on an HP 9836 computer. has been moved three times over the years. The only real upgrade has been to a used computer running UMESS 300 20 years or so ago. It will be replaced with a Prismo 10 Ultra in a few weeks.

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Yes, it's an ST. Stands for German _S_chaltender _T_astkopf (switching probe head)
We had the same head at first, but I wasn't too fond of it. Main problem was, it had 3 switches placed under 120 degrees around the head. To recognize a correct touch, one of the switches needed to open within a certain time frame after the piezo had triggered. The piezo alone would have been too sensitive.
If the switch didn't open within the time frame, the controller retried six times. If that was unsuccesful too, the machine errored and the program stopped. Depending on where that happened, you would have had to run the program from the start again and hope it'd work this time.
Because of the three switch positions there were preferred directions in which the touch almost always worked, and others where you could already smell failure. It was always suspenseful to watch such a program run. 🤣
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