Setting an internal micrometer

This topic has 3 replies, 3 voices, and was last updated 14 February 2018 at 19:52 by vintagengineer.

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14 February 2018 at 16:08 #341492
John MC
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@johnmc39344
I have a Fowler-Bowers internal micrometer, 0.50" to 0.62" range, the type with 3 expanding pins. While it is accurate to the various setting rings I have, the scale on the thimble does not quite line up with the scale on the sleeve, if that makes sense, enough to cause a reading error unless I am careful.

On an external micrometer this type of error can usually be corrected by moving the sleeve axially with a tiny C spanner.

I've looked at the manufacturers website, it explains resetting the thimble to a gauge but not resetting the sleeve.

Its bound to catch me out one day so I would like to reset the sleeve,anyone know how?

John
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14 February 2018 at 16:08 #18848
John MC
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@johnmc39344
14 February 2018 at 16:44 #341504
ronan walsh
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@ronanwalsh98054
Can you not send it back to the manufacturer for calibration ? Might be the easiest way to do it.
14 February 2018 at 19:52 #341536
vintagengineer
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@vintagengineer
I will have a look at mine tomorrow. Have you tried unscrewing the the thimble? I think there is an adjustable ring under the thimble.
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Setting an internal micrometer

Setting an internal micrometer

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