Snack or a meal ? It depends on how much you want to learn. I found that out as I began to explore and assemble for the Gin Pole and winch set ups that will be used to raise each assembled lattice bridge truss to vertical. Earlier in the project using what we learned about rough sawn lumber and calculating Board Footage we determined the weight of each truss as being 5,700 pounds. From Milton's book we saw how Gin Poles and winches were rigged and used to handle this kind of weight and raise a bridge truss to vertical by hand. Alex and I tested this out using the 3/8 scale model shown in the pictures below.
Then I looked at the routing of wire rope and how it would be wound on the drum (see picture above). They say there is nothing scarier than the shadow of a doubt. The more I looked the more I wondered. Did I have it wrong? There is another saying too, "when all else fails look at the instructions." Good idea. Sure enough, ten pages and a pretty good picture showing the wire rope threaded in the larger hole and then there was the reference to winding under or over the drum? OK, time to get out the ol' Machinery's Handbook and get more input on the subject. Page 465, "Installing Wire Rope" First it talked about avoiding kinking and how to remove wire rope from a reel vs a coil. Oh, this was good! Then they went into right lay and left lay rope (the helix of the twist just like screw threads). Overwound or underwound on the drum and which drum flange to start winding against! I started out thinking this would be an little educational snack but I soon discovered there was enough new learning here for a seven course meal! I dug in and got more answers to my questions (I also got more questions to my answers!). Even the capacity of the drum. I needed to know if the drum could hold all the wire rope used in the block and tackle set-up to to raise the truss.
Puzzler - What is the Recommended Working Capacity of this winch?
Tech Vocab - Total Drum Storage Capacity, Total Working Drum Capacity, Recommended Working Capacity, Dead Wraps, Freeboard, Barrel diameter, Flange diameter, Drum length, Cable diameter, Fleet Angle,