How to inspect Mylars to verify dimensions, grid lines and grid points

B

bronco-vinny

#1
Need information or a procedure in how to inspect mylars. I have no idea how to set up and inspect to verify dimensions, grid lines and grid points. :frust:
 
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Jim Wynne

Staff member
Admin
#3
Need information or a procedure in how to inspect mylars. I have no idea how to set up and inspect to verify dimensions, grid lines and grid points. :frust:
I assume that you're referring to mylar overlays used on optical comparators? If so, you can use the comparator (assuming proper calibration) to verify the dimensioning and locations of gridlines, etc.. You can double-check by using the overlays to measure actual parts and then doing using another method to measure them to verify consilience.
 

rstocum

Involved In Discussions
#6
When I worked in aerospace, I made mylar layout drawings for the placement of fastener holes, and for verifying other feature locations. They were meant to be used by fabricators on the shop floor, and the quality people put them in the quality system as "for reference only". They can't be verified. If this is the type of mylar you mean, I wish there was a better answer.
 

Jim Wynne

Staff member
Admin
#8
Usually for drawing reproduction purposes.

Mylars are often required as part of (civil) engineering-type contracts.

Stijloor.
I understand the use of mylar as a drawing medium; what I don't understand is why they (as opposed to drawings on vellum or plain paper) should need to be verified in the way the OP is asking about.
 

Stijloor

Staff member
Super Moderator
#9
I understand the use of mylar as a drawing medium; what I don't understand is why they (as opposed to drawings on vellum or plain paper) should need to be verified in the way the OP is asking about.
The OP needs to further clarify if he expects us to help him...

Stijloor.
 

Coury Ferguson

Moderator here to help
Staff member
Super Moderator
#10
Thank you Jim on your reply. I was not clear it's mylar drawings
When I worked for a company that mainly made sheet metal we used Mylars to perform the actual inspection of the sheet metal parts. They were to Scale so we would lay the Mylar over the flat pattern and verify that each dimension was correct.

This might not be what you were looking for, but that is the only experience I have had with Mylars.
 
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