In article ,
Ignoramus26879 wrote:

On 2010-05-01, Joseph Gwinn wrote:
In article ,
Ignoramus9191 wrote:

http://igor.chudov.com/projects/Weld...ble-Grab-Hook/

I welded this double hook from two Harbor Freight grab hooks and a
1/4" steel plate. The purpose of it is to let me use arbitrary lengths
of chain, single and two ends, when lifting stuff, as well as grab to
access lifting eyes with just a piece of chain (see last
picture). Welding was done with 1/8" E7018 electrodes.

While you will no doubt get lots of advice on welding and redoing the heat
treatment of the hooks (if HF hooks are in fact heat treated), don't forget
to
proof test this to four times the intended max load.

I just proof tested it in a 12 ton arbor press. See my another
post. This was actually a good idea Joe.

I don't quite visualize how you used the arbor press, but another poster
questioned if the 0.250" plate was thick enough, and the hook loop looked a bit
thin to my eye.

I actually have no idea if the plate and loop are strong enough, but the most
reliable test is to lift something using this fixture. Do this twice, with a
fully asymmetrical load - full test load on the left hook, then full test load
on the right hook.

You said that the max intended is 1000#, so the proof test load is 4000#.

This test is cruel. The point is to break it in test, if it's going to break at
all.

Joe Gwinn