Quote:
Originally Posted by EricH
Running that sort of system... I don't think 330 used anything more than a turnbuckle while running wire rope through their lifts. (Up to 10' long lifts, for anybody keeping track at home.) Generally, though, we were able to keep the wraps flat, just by having enough space. I don't think we did anything else special. (Turnbuckle, if used, was a between-match tensioning if things were getting loose.)
Remember that the cable is often only about 1/4" thick, or maybe less, counting the coating, so if you have two wraps, the effective diameter only increased by 1/2" or so; most likely, the other direction decreased by that much. You'd notice a variation in speed, maybe, but more likely than not tension won't be affected very much. Maybe use a small extension spring, but that's about it.
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Thanks for the quick reply, EricH. Did 330 do anything specific to ensure the wraps remained flat? Regardless, do you have a few pictures of the setup to share?
Regarding your comment about the diameter changing with wrapping cable on itself: Even a wrap diameter increase of 0.5" is approximately an additional 1.5" of circumference, meaning with one drive pulley revolution, one cable will have fed in or out 1.5" further (assumes the up-feed and down-feed drive pulleys are driven off of the same shaft), which seems significant. Thoughts?