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Hello everyone. Have not been around here much lately...
I've run into a technical curiosity from my company's history that I though someone here might know about. I am now in the world of fastener manufacturing - primarily nuts and bolts - and we are required to submit to IMDS.
For calculating the weight of plating and coatings, most of our plants use Surface Area X Thickness X Density. At some point in the past, well before my time, we also published an internal IMDS guide along with training slides that used the following formulas:
Coating Weight of:
Bolt = .005 x Part Weight
Washer = .003 x Part Weight
Patch (Loctite, etc.) weight = .25 X Plating Weight
Using a fudge factor such as these is easier than calculating surface area, but I can't justify using them without knowing where the numbers came from - especially with the varying thicknesses and densities of coatings we use. Most of the documentation I have seen comes out of IMDS information, so I get the feeling these may have been generally accepted factors. It could also be someone pulled them out of thin air. The usage goes back at least eight years.
Has anyone seen factors like this used in the past and know of their source?
I've run into a technical curiosity from my company's history that I though someone here might know about. I am now in the world of fastener manufacturing - primarily nuts and bolts - and we are required to submit to IMDS.
For calculating the weight of plating and coatings, most of our plants use Surface Area X Thickness X Density. At some point in the past, well before my time, we also published an internal IMDS guide along with training slides that used the following formulas:
Coating Weight of:
Bolt = .005 x Part Weight
Washer = .003 x Part Weight
Patch (Loctite, etc.) weight = .25 X Plating Weight
Using a fudge factor such as these is easier than calculating surface area, but I can't justify using them without knowing where the numbers came from - especially with the varying thicknesses and densities of coatings we use. Most of the documentation I have seen comes out of IMDS information, so I get the feeling these may have been generally accepted factors. It could also be someone pulled them out of thin air. The usage goes back at least eight years.
Has anyone seen factors like this used in the past and know of their source?