Building my bridge crane

[murphy1244]

Well a least your lights are on chains. Just tuck them up,no?

 

[LD1]

Well a least your lights are on chains. Just tuck them up,no?

They are on fixed length cables at each end, looped over a 1-hole conduit strap serving as the hook.

I'll either add a second strap or give the cable a few wraps around the existing strap. Havent decided yet

 

[Shield Arc]

Yea, Top runners. I thought you got that. I said it a few times

Oh I'm a bit slow at times.
My span beam pulled by hand really easy, but when I needed to get close to the back of the shop I could not get enough angle to pull on the span beam. So I used a 120-volt winch to power the span beam.

 

[LD1]

hard to see how the winch is set up.

IS it on the span beam? And one loop over the spool and cable anchored and either end? reversible? If thats what it is, I kinda like that Idea.

Something like this:

 

[Shield Arc]

You got it!:thumbsup: I had to build the fair leads, to make sure the wire rope did not ride over it's self.
Yes the winch is reversible. It works great!

 

[LD1]

My only concern on doing that with my beam, is pulling from the middle with such a long span. What do you do to keep the cable tight?

 

[farm boy00]

My only concern on doing that with my beam, is pulling from the middle with such a long span. What do you do to keep the cable tight?

You could use turn buckles.


I'm just another Stalker in the background watching this project

 

[SPYDERLK]

My only concern on doing that with my beam, is pulling from the middle with such a long span. What do you do to keep the cable tight?

STIFF spring with mechanical limit.

 

[ProjectKing]

WRONG! ... The tapered ends act to blend the stiffness from the beam into the stiffer area of the patch. Also the taper away from the edges of the flange inhibit a tear/crack beginning at the edge of the flange. ,,, Bolting is a bad idea in comparison to a good weld. Many stress riser sharp edges are inherent in drilling holes, and are difficult to blend out to alleviate cracking. ... Also you lose the strength of the material removed from the holes. larry

Yeah I'm going to disagree with you on that! Have you run FEA on both design to look at stress concentrations?

Also bolting is a more controlled solution to splice two beams together. Done all the time in I-beam structures. Multiple bolt holes distribute stress loads and friction force holds everything together.

 

[Citydude]

Gee LD, the last I remember, you were sorting through a load of lumber looking for straight purlins. Got to give you a huge attaboy on your awesome shop!