Another Home Made Shop Jib Crane

[Rbeckett]

Ken,
That almost qualifies for a gloat. That paint job and the pillow blocks are top shelf. How much weight do you think it can safely lift? Looks like it is pretty stout and cold lift anything that fits on your machinery easilly. Have fun and enjoy saving your back.
Bob

 

[4GSR]

That almost qualifies for a gloat. Bob

LOL.

"How much weight do you think it can safely lift?"

I designed it to lift a maximum of 500 lbs.(trolly extended) with a 3 to 1 safety factor.

I picked up the tailstock to my 20" L & S to make sure it would handle it. Little "bouncy" but handled it fine. Tailstock weight around 400 lbs.

I got to make up some stickers to post weight limit. Of course, i'm the only one that would use it. My Son would probably try to lift the left side of the World with it!

 

[strantor]

I designed it to lift a maximum of 500 lbs.(trolly extended) with a 3 to 1 safety factor.

How do you design it with a certain load guaranteed, or at least with a certain load as a goal?

or, more importantly, if I wanted to build one, how could I design it toward a certain load capacity?

I assume the weak link is the shear rating of the bolts at the end of the boom, and then you apply some formula representing the geometry of the triangle to the downward weight on it?

 

[Tony Wells]

Here's some reading and design guidelines for jib cranes, a very practical home shop job. But you really should do the homework if you want to build one.

http://ar.inel.gov/images/pdf/200502/2005022300984KAH.pdf

http://www.google.com/url?sa=t&rct=...64CIBA&usg=AFQjCNFNKadO9R6VzTJO8ibzwT4liIsruQ


Ken has been around plenty of factory built cranes, so has a certain instinct about them, but I am confident he did enough homework to be safe. I've built a couple, and designed a few. It's not difficult, but worth doing right.