Posted 3 years ago
BHIFOS
(399 items)
This one has me stumped I know what micrometers are must have 50+ (yeah I collect machinist tools too but I do use some as I have a lathe and milling machine that I try to convince myself I know what I'm doing with) but Mr Google doesn't seem to acknowledge it's existence, . Has Ambrose Shardlow & Co LTD Sheffield England on the thimble but nothing else no model number nada. To measure between the anvils you turn the thimble counter clockwise and then it springs back slowly to closed letting you measure the thickness on the dial which appears to be calibrated in thousands of an inch. The back outer ring on the dial can be turned so the red mark can be set to a particular measurement almost like you would be checking for a particular setting. The gap is too small for checking brake discs maybe it's for checking sheet metal by a quality control guy.......any ideas anyone? Oh and it's 9 3/4" long, yes measured in imperial figures!
It definitely has a long reach, like you would be checking consistency over a large area?
Yes or trying to get off the edge where the thickness might not be so regular.
My guess is that it is a sort of micrometer, but one that was not used for general purpose (obviously), but for periodic testing in production use
It's very definitely a sheetmetal micrometer. The reason for the long throat is sheetmetal is often thinner close to the edge. Shardlow made very good tools. I inherited my father's 1" mike which he bought as an apprentice circa 1943 and its still going strong. Easily the equal of Moore & Wright or Mitutoyo.