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Trial and Error Opperator
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Discussion Starter · #1 ·
On a job, guy has requested 2 mil profile ....

I am using press-o-film, x-coarse so I'll be in tolerance of 1.5 to 4.5 mil

The guy bought me a hand tuned micrometer
( I wanted a spring loaded) but here is my problem.

I'm testing aluminum thick stock, using 30/60 crushed glass, 260 cfm, 90 psi at pot, #5 win (test dry and wet)

Need to know if I'm figuring right

Tape measures .016 new, measurement after
blasted= .006, three different test strip done.
So, .016 - .006= .010 is this 1 mil?
I want to be sure I'm moving the Dec point right?

Second problem, same test on steel L beam
I test and still get 1 mill
But looks and feels much less profile than the aluminum...

Am I going nuts or is the hand micrometer the wrong tool... which I think it is...

I think it's squashing the milo

Any input good or bad please
I have thick skin, so give it to me
 

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Trial and Error Opperator
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Discussion Starter · #2 · (Edited)
Picture of micrometer and blasted aluminum

aluminum on left / steel on right
 

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You need a micrometer specifically designed for profile tape. Also, you'll need course grade tape to find an average of 2.0 mil

Below is a vid for your reference.


That's pretty much the high and low of it. :cheesygri
 

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You need to be using the correct micrometer. It needs to be a round flat anvil type. Have a picture of the micrometer that your using?
 

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This is the type micrometer that you should be using. The one that your using is just going to flatten out the foam on the tape giving you a false reading. Glad your not inspecting any of my work. Lol!!
 

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From experience, with that grit and pressure on aluminum you should have no problem getting 2+ mils of profile. Probably more on the plus side truth be told.
 

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Maker of Fine Sawdust
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Trial and Error Opperator
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Discussion Starter · #11 ·
This is the type micrometer that you should be using. The one that your using is just going to flatten out the foam on the tape giving you a false reading. Glad your not inspecting any of my work. Lol!!

Thanks Beny!
 
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