The Elsmar Cove Business Systems and Standards Discussion Forums Microfinish conversion - Micrometers (?) to microinches?
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# Microfinish conversion - Micrometers (?) to microinches?

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Post Number #1
17th May 2004, 11:37 AM
 Proud Liberal Total Posts: 150
Microfinish conversion - Micrometers (?) to microinches?

Sorry if this is the wrong forum for this question.

What's the converion from micrometers (?) to microinches? The specification is 1.27 to 3.31 in metric.

Post Number #2
17th May 2004, 12:24 PM
 Bill Ryan - 2007 Total Posts: 978
Quote:
 In Reply to Parent Post by Proud Liberal Sorry if this is the wrong forum for this question. What's the converion from micrometers (?) to microinches? The specification is 1.27 to 3.31 in metric.
1 microinch = 0.0254 micrometer
In microinch your specification would be roughly 50/130 (there are rounding errors!)

Last edited by Bill Ryan - 2007; 17th May 2004 at 12:26 PM.
Post Number #3
17th May 2004, 12:25 PM
 Al Rosen Total Posts: 3,583
Quote:
 In Reply to Parent Post by Proud Liberal Sorry if this is the wrong forum for this question. What's the converion from micrometers (?) to microinches? The specification is 1.27 to 3.31 in metric.
There are 25.4 mm/inch, so I think there are 0.0254 micrometer per microinch.
Post Number #4
18th May 2004, 08:36 AM
 JerryStem Total Posts: 269
We measure plating thicknesses in microinches and microns. I usually convert by:

microinches * .0254 = microns

microns / .0254 = microinches

Also, 1 micron = roughly 40u" but you get a small rounding error. It's just convenient for quick checks sometimes without a calculator...

Jerry

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