XYYZ Gantry

Someone wrote: "This had been discussed before in
previous post. Check the archives"

Did that (checked archives) using search word "gantry"
at my workplace (network). Took >10 minutes and got a
long list of messages. Those with long memory, some
spare time, and plenty of sympathy, please tell me how
to refine my search or even better, provide a summary
of what is involved in a XYYZ or XXYZ gantry.

Thank you in advance

Peter


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