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I understand it is easier to make the shell from inward out around a mandrel, but the reason they don't normally construct them that way is a drum has a standard OD say for a 14" shell actually they are 1/8" undersized.When you layup the plies from inward it is harder to keep your OD correct do...

Here is a finished drumhttp://files.engineering.com/getfile.aspx?folder=bf26140b-5d63-4d22-96fe-f6c50091a7bc&file=cherrytom2.gif

Hey Mike, The image is from a drum company. I build drum shells (musical instruments) I have a 13.75 id steel mould .Basically it is a pipe 13.75 ID by 18" depth. You place veneers in usually 2-3 plies,glue between them to form the shell. So the part in the picture is the internal pressure...

Thanks for the replies. Is there a chance you could describe the set up. I've been trying to build a set up like this and could use all the help I can get.

Hello, Can anyone explain the way this system works. Thanks

Hello, I was wondering if anyone has experience with air pressure.I have a mold..It is made from MDF board it is 3/4 inch thick rings stacked up 20" high they were cut from a computer router in 24 3/4" x 24 3/4" squares with a circle cut out 21 7/8" diameter. They are stacked up to form a cube...