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From: Bob La Londe <none@none.com99>
Newsgroups: rec.crafts.metalworking
Subject: Re: Shop Crane Revisited
Date: Sun, 22 Dec 2024 09:59:35 -0700
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On 12/22/2024 8:13 AM, Jim Wilkins wrote:
> "Snag"  wrote in message news:vk8144$f4q8$1@dont-email.me...
> 
> On 12/21/2024 6:41 PM, Bob La Londe wrote:
> 
>> Hmmmm....  I wonder if I 'll get lucky and stumble across a big piece 
>> of thick wall steel tube I can use to make a jib crane over by the 
>> mills and lathe in the back of the shop.
>>
>    Depending on the load capacity needed ... I built 2 swiveling jib
> cranes with a portable base* for handling firewood . My first out of 2x2
> thin wall square tube and I've handled up to about 400 lbs with it using
> a hand crank . Then I got some thick wall and built another with a 2500
> Lb electric winch mounted on it . *I also built a pivot mount in the
> front corner of my 5z8 utility trailer . The light unit with the hand
> crank stays on the portable base , been useful for tasks like hanging a
> truck door out of my way while I replace hinge pins . The other stays on
> the trailer for handling firewood rounds and dragging logs out of a
> tangle .


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.  Standard height 8' ceiling office inside a 
metal building with a 16' eve height.  Roof of office was built with 
2x12s on 16" centers, and hen ineter laced with two layers of 3/4 
plywood glued and screwed to the beam/joists and glued and screwed 
together,  Both layers are half lapped.  Theoretically two corners could 
be slightly weaker, but each is supported by two walls at the corner. 
Not enough difference to make a difference.  I intended storage up there 
when I built it.  I don't like carrying stuff up and down the to steep 
stairs (that's how much room there was at them time), or throwing things 
up there.

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
CNC Molds N Stuff

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