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  #1  
Old Tue 17 May 2011, 11:17
sierra347
Just call me: Armando #110
 
Montgomery, IL
United States of America
X Rail I beam thickness??

Have been looking for cheap c channel or I beams and have come empty handed on the c channel but there are plenty of cheap I beams around. My question is regarding the thickness of the web, is 1/4 inch thick too thin on a 8" beam? there are also 12" beams with the 1/4 web. Would the 1/4 web 12" work although I would have to deal with raising the cutting surface.
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Old Tue 17 May 2011, 19:26
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
Mando.
The C channel specified for the machine can be either C 8" x 11.5#/Ft or higher which has a modulus of 8.14 in the x-x plane.
The W or S shape "I beam" of that height and equal weight does have a section modulus in the x and y that meet or exceed that requirement. For example a W12x16# has a modulus of 14.9.

This is only one part of the criterea where bending moment, shear and 1/360 span formula's apply...but in the spirit of the Mechmate, your "found" steel sections will be fine.

If any of the qualified engineers in the room disagree....please advise. I only play an engineer on TV!

Best,
SEan

Last edited by smreish; Tue 17 May 2011 at 19:29..
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