double micro pully

[klimbinfool]

Has anyone used the the CMI double micro pulley for redirects yet? A buddy of mine and me have found it a real pain to put your lines in. The cheek plates are to short and by the time you put your carabiner in , it rubs a tad on the rope. We pulled out the center piece of this unit for more clearence. Wi'll this change the weight rating? and what is that center piece for anyway?.Alls I can think of is that they would hook two in tandum.

Thanks
Greg

 

[klimbinfool]

thats probably true Tree but i'm not sure.Maybe someone else can give us some insite on it as well. think I will write them too.

Greg

 

[roachy]

I have had the rubbing problem with this pulley .I use a oval screwlink biner and the rub is not so bad.

 

[Treepreacher51]

Greg Did you find it odd that CMI sent out that pulley w/o a scrap of literature regarding specs, safe use ect.? It has a load rating of 7000 lbs stamped on the side plates but thats it. For those of you who havn't seen it yet, it appears that they used the same plates used on a standard CMI micro pulley ,changing the angle of the bend to accomidate the longer pin. This is avery cool pulley and I like it, But it seems to me that CMI could improve in. Perhape It would make the pulley too expensive to not use the existing micro pulley side plates.

 

[klimbinfool]

this is a side by side pulley by CMI.I use it fot redirecting.However, the cheek plates where kept the same as the regular micro.Roachy, thanks for that idea. I will try it.

greg

 

[TheTreeSpyder]

Hey-
Is this a double pulley like a tandem for speed line, or a double that could be used for mech. adv. systems?

The 1" sheaves are always less efficient even without rope dragging on cheek plates; CMI tests put them at ~85%. They all carry less efficient bushings riding axle.

The CMI double for mech, adv. tested at ~133+% efficiency for the untit!

Whereas the 2 3/8" 91-95%; 4" w/bearing riding axle run on up to 98%!

The bearing riding axle is more efficinet, but doesn't last as long, then the larger the ratio of sheave / axle, the more mechanical advantage on whatever resistance the bearing or bushing have to monement.

-KC