If you are designing a building you use deflection as primary criteria
because what goes in the building needs a stable structure and you want to
avoid floors having a bouncy feel. For cranes you use the moment and
bending stress.as primary and deflection can be greater.

--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com

"Proctologically Violated©®" wrote in message
...
How did you determine what an "acceptable" deflection would be? Building
codes?
--
Mr. P.V.'d
formerly Droll Troll
"Mark Rand" wrote in message
...
On Fri, 17 Mar 2006 16:45:26 -0600, WILLIAM HENRY

wrote:

wrote:
I am installing a small I beam trolley in my work shop that can lift a
1000#
max size of beam is important because of head space so I am looking for
information on length and sizing and capacity of beams

Ed


length of beam and method of supporting said beam are pretty big
factors , a four inch i beanm will carry that load if properly supported

i use a program called beam boy for sizing beams at work , it is
free-ware , just google beam-boy

Second that comment. I used beam boy to size the 27ft long beam that
holds up
my workshop roof.


Mark Rand
RTFM