Scott

You need to know the thickness of belt as well. The general equation is :

Lenght = no. of turns * 1/2 * 22/7 * ( dia outer + dia inner)
        where no. of turns are = ( dia outer -dia inner) / thickness of belt

Hence , the Lenghth will be = [1/2 * 22/7 * {SQ( dia outer) - SQ(dia
inner)}]/ thickness of belt

It is assumed that belt is rolled tight - gaps between layers are negligible
as compared to thickness of belt.

I used this formula for counting components on SMT tape & reels - the counts
had been approximate and quick to do.




Ashok Dhawan P.Eng.
Engineering
C-MAC Network Systems Inc.
1455 Mountain Roar
Winnipeg Manitoba R2X 2Y9
WWW.CMAC.COM
TEL (204) 631 7208
FAX (204) 631 7294



> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Scott Kauling
> Sent: Thursday, January 03, 2002 3:30 PM
> To: [log in to unmask]
> Subject: [TN] Distance Formula
>
>
> I have a roll of belting, I know the inner diameter the outer diameter and
> how many layers are on the roll.  What is the formula to calculate the
> length of the belting.
>
> Thanks in advance.
>
> Scott Kauling
>
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