American 7260 crawler crane

[Rvjimd]

HOLY COW, that is nice! I just went thru the four pages, and wow.

Eef,

I am thinking about building a crane or converting a second Menck, or just rigging my current dragline for clamshell operation. Can you help me understand how the two ropes work together with a clamshell bucket?

At first I thought it was simple but is there something else beside just one rope to hoist Nd the second to open and close the clam?

What I don't understand is how to keep the clam rope from going slack when the bucket is hoisted? Is it simply running both drums even and together or is there something else?

Anyone else also, please feel free to respond if you have some info.

Thanks

Jim