On Sat, 2 Sep 2017 19:57:57 -0400, "Jim Wilkins"
wrote:

"Carl Ijames" wrote in message
news
"Jim Wilkins" wrote in message news ...

I think I misunderstood your layout so I better stop "helping" :-).
The link you posted to a splice diagram showed an I beam, so I
assumed you were using two C channels back to back to simulate an I
beam with a thick vertical web. If that's the case I still think my
three splice instead of one layout would be almost as easy to
assemble and would be stronger. Just for confirmation, the program
I use (Engineering Power Tools, free or shareware for more features
at www.pwr-tools.com) gives peak stress 24.9 ksi and 1.32"
deflection for 1000 lbs at center and 16' span for one C channel.

--
Regards,
Carl Ijames

Your assumption is correct, two channels back to back with sections of
3/8" plate between them at the ends as hangers and as splices between

Oh, right. Using C, you can shim/splice between for center strength,
then reposition the extra washers on the trolley to compensate.


--
Do not let your fire go out, spark by irreplacable spark.

In the hopeless swamps of the not quite, the not yet, and
the not at all, do not let the hero in your soul perish
and leave only frustration for the life you deserved, but
never have been able to reach.

The world you desire can be won, it exists, it is real,
it is possible, it is yours.
-- Ayn Rand