Re: Shop Crane Revisited

"Bob La Londe"  wrote in message news:vk9ghm$mv2t$1@dont-email.me...
For a jib crane I am thinking something a little more substantial.
although bolting part of an engine hoist or truck bed crane on to the
roof of my office did occur to me.  I'd like something for triple duty.
I don;t often swing heavy parts onto the lathe or mill in the back, but
I do from time to time.  Heavier than the hundred pound vise I take off
and put on the mill table.  I'd like to have a jig with a trolley so I
can set things on the mill table, into the chuck jaws, and lift things
up to the roof of my office. ...
I'm thinking if I could find a twenty foot piece of 6inch well casing or
similar I could build both ends onto roller bearings and easily swing
1000-1500 pounds on a relatively short jib of 6-8 feet and meet all
three purposes.  I'd probably get the Harbor Freight trolley and the
1300 pound electric winch they sell.
A jib crane is really secondary.  Primary is a gantry crane to meet most
of my needs without buying a forklift.  Yes I have bucket forks, but
they will only lift about 1500 (and it complains about it) pounds, the
tractor doesn't have room in the shop, and it doesn't reach high enough.
--
Bob La Londe
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https://alaskahomesteadadventures.com/blog/2017/10/24/cabin-5-gin-pole
The guy lines on my TV antenna attach to a loose fitting ring suspended by cords attached further up, which allows the mast to rotate without bearings.
The bottom ends of my 2" pipe shear legs are 1/2+  balls turned from both ends of a dumbbell, with a step on the handle end that supports the pipe. The socket is layers of plywood reinforced with welded angle iron. They have lifted and shifted ~3000 Lbs without noticeable damage. Like the tripods the column loading is all straight down the center, no cantilevered bending as with a jib crane.