Round shell flat pattern
Round shell flat pattern
(OP)
When creating a flat pattern I am using the following formula for all of our material from 3/16" up.
[ID + (.8 (1material thickness))](Pi)
Then on our sheet material we are using the following formula.
[ID + (1 material thickness)] (Pi)
My questions is. Am I using the correct formulas for determining the flat pattern?
Please advise.
[ID + (.8 (1material thickness))](Pi)
Then on our sheet material we are using the following formula.
[ID + (1 material thickness)] (Pi)
My questions is. Am I using the correct formulas for determining the flat pattern?
Please advise.





RE: Round shell flat pattern
Your second formula is mean diameter, no allowance.
You have to kind of see what works for whatever shop is doing the work. Early input might be a good idea. Otherwise add a drawing note stating no allowances are provided, fabricator is responsible.
Regards,
Mike