Posted by bc on January 30, 2010 at 00:36:36 from (71.158.221.179):
In Reply to: OT cable strength posted by Troy L on January 29, 2010 at 11:16:12:
You would have to change all the sheaves to match the new cable including the crown block and not just the traveling block. But more importantly you should look at the drum and see if it is grooved for 5/8" cable. If so, the 1/2" will never lap right and will cross over till it pinches and ruins the cable and maybe somebody's life.
Not sure I'd mess with it and it won't save any money changing out new sheaves and blocks.
I've run a couple cranes and worked in the oilfieds for years drilling on drilling rigs and even ran a cable tool rig once. I've changed and spliced cable and changed winch cables on trucks.
The other part of the equation for grooved or ungrooved drums is that the diameter and and width of the drum is matched to the size of the cable. Even when respooling a drum with new cable, we spend a lot of time with a hammer pounding each wrap in tight. If you don't get the first and each subsequent row tight and with the cable pulled on in the right direction with the right twist, you will never get it to run right on the drum until you end up with a rat's nest and kinked and ruined cable.
For the strength rating of the cables, check the manufacturer. That info is probably on the web somewhere.
With a crane, you have certain safety rules and insurance issues to deal with. You also have to follow the crane mfr recommendations. And it will change all the lift tables and ratings for the crane at each different angle you have the boom set at (an accident waiting to happen for some new operator who doesn't understand all that stuff)
Stick with the 5/8" cable. Or demote that operator to swamper and let him work under that crane.
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