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QUESTION:What are you going to use for a boom hoisting mechanism on your crane?
I tried using side by side air pistons. They would raise the boom from
-5' to 80' approx. The problems was as the crane hoisted any amount of
weight the cylinder would collapse or the hose would come off the
cylinder.volt motor. The boom on my crane is 15in long (fully retracted) and the
foot mast is 9 in long. When the boom is horizontal the boom hoist must
have fresh batteries to lift it up to vertical. With the boom fully
telescoped (its 3 parts) the boom is 42" long
ANSWER: The pneumatics might still work-use 4 pumps as on the crane truck but
two by two. I understand the problem with the pipes though. The new
hoses aren't so bad, but the hose to the main jib pumps on my excavator
do pop off sometimes.. like when I am trying to lift shoes off the floor
to see how strong it is for example!
Wow, that is huge. The crane truck comes nowhere near that. I built
two foot booms sometimes...but only the booms. I had a variety of
problems listed here:
The new turntable wasn't available. If the turntable mechanism didn't
collapse under the weight, then it would be so stiff that it wouldn;t
turn.
The whole damn thing would fall over, no matter how many train weights,
bags of sugar etc I added to the back. Trying to solve it taught me a
lot about moments, such as moving the pivot back is fairly irrelevant.
The bend on the jib would be immense (flexure and all kinds of stuff is
in my head, just did an exam on it, but it won't help here). And the
more you strengthen it, the more dead load you add so the more weight to
raise and support.
I used to find that mechanisms for extending the jib were pretty bulky
and ineffecient. The one on the crane truck isn't that great. Try
extending with any kind of load on the hook.
And as mentioned the pumps would lose hoses, or simply sink back down
under the weight. Same problem with dumper trucks as well. I never
figured out the simple mechanism used on the crane truck to get a large
throw from the pumps. Doh. Maybe the airtank would help raising the
pumps as well. I know the compressor doesn't have the guts to do
it..even when you put 12v, 5amps through it!
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