Terry, Ron and list, Ron wrote; >This came up a few months ago regarding Steinway plate locator holes and >the unfortunate fact that the plate hole so rarely matched the hole >beneath. Clearly datum holes are intended to be a reference. When plates are drilled using CNC borers, the datums are drilled after taking reference measurements from some point/s on the casting, prior to setting the plate for machining. When the datum holes on the plate don't match the associated datum marks on the belly, it tells you something about the overall accuracy of the production process. >The holes were drilled for indexing, whether it was for >drilling plate holes, locating bridges, positioning the plate in the case, >or all of the above. It's most likely original factory locator holing, >rather than anything done later. Hear here Ron. Ron Overs Overs Pianos, Sydney Australia ------------------------------- Email: sec@overspianos.com.au Website: www.overspianos.com.au -------------------------------
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