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labgrade · January 21, 2000, 11:31 AM

First of all, blow off that .0001" when dealing with COAL. A human hair is about .003" & trying to be so precise in your measuring in this area will just drive you crazy.

Sounds like you're using a micrometer (X.0001" resolution - I hope you're not expecting this type res out of a caliper). Unless a speciality type micrometer, the spindle rotates which can cause measuring errors well within what you've reported - just due to techinique. Unless everything is positioned the exact same way everytime, you're gonna get variations. Your cartridges may all be the same size.

OAL variations in your 1st post is about .003" is well within anything you can expect unless using custom equipment.

January 21, 2000, 11:31 AM	#4
labgrade Member In Memoriam Join Date: November 29, 1999 Location: west of a small town, CO Posts: 4,346	First of all, blow off that .0001" when dealing with COAL. A human hair is about .003" & trying to be so precise in your measuring in this area will just drive you crazy. Sounds like you're using a micrometer (X.0001" resolution - I hope you're not expecting this type res out of a caliper). Unless a speciality type micrometer, the spindle rotates which can cause measuring errors well within what you've reported - just due to techinique. Unless everything is positioned the exact same way everytime, you're gonna get variations. Your cartridges may all be the same size. OAL variations in your 1st post is about .003" is well within anything you can expect unless using custom equipment.