We manufacture a wide range of sheaves for the entertainment and other industries, ranging from our tiny /64in. size up to our 1/2in. sizes. Some of our sheaves are also available with double and even triple pulleys. We mill the cheeks from 6061 T6 aluminum billet on our CNC machines. We turn the pulleys for the 3/64in. sheaves, the 1/2' Kernmantle rope snatch blocks, the 5/8' Highline Dolly wheels and the 1/2in. sheaves on our CNC lathe. The bearings on the 3/64' and 3/32' are shielded single row ball bearings. The bearings on the 1/8' diamond sheaves are precision metric sealed single row ball bearings. All other pullies use precision metric double row sealed ball bearings. Please note that these sheaves are dead quiet in use, unlike many marine, industrial, and rock climbing sheaves. The most keen eared sound person will not hear a thing. Please note that many of these sheaves are smaller than the ideal D:D ratio, for convenience of rigging and concealment. These sheaves are in wide use for all sorts of cable and synthetic rope rigging for special effects, stunts, theater, industrial and scientific venues. We have destructive tested all of these sizes. In all cases the cable broke before the sheave was damaged. Cheeks are CNC milled and black type II anodized. Fasteners are stainless or alloy steel.
A whole bunch of our sheaves in a Cablecam highline rig. 3/16" HS diamonds, 3/16" HS pears, 1/4" diamond snatch, and a couple of custom sheaves.
We have our first 1/2 inch Diamond Sheave test hanging on the shop wall. We put a 1/2 inch cable sling through the sheave, and pulled on Ver Sale"s tester until the cable broke at 52,000 pounds. The sheave was only slightly hurt: the pulley was marked by the cable strands, and the bearing was slightly rough. We rated it at the bearing manufacturers max load of 5840 lbs.