06/10/2026
๐ช๐ต๐ฎ๐ ๐๐ ๐ฎ ๐๐น๐ฒ๐ฒ๐ ๐๐ป๐ด๐น๐ฒ? ๐๐ป๐ฑ ๐ช๐ต๐ ๐๐ ๐ ๐ฎ๐๐๐ฒ๐ฟ๐
๐๐๐๐จ๐ฆยฎ ๐๐
๐ฝ๐น๐ฎ๐ถ๐ป๐: ๐ฃ๐ฎ๐ฟ๐ ๐ญ ๐ผ๐ณ ๐ฒ
Every multi-layer winch drum has to solve the same geometry problem:
๐๐ผ๐ ๐ฑ๐ผ๐ฒ๐ ๐๐ต๐ฒ ๐ฟ๐ผ๐ฝ๐ฒ ๐บ๐ผ๐๐ฒ ๐ฐ๐น๐ฒ๐ฎ๐ป๐น๐ ๐ณ๐ฟ๐ผ๐บ ๐ผ๐ป๐ฒ ๐น๐ฎ๐๐ฒ๐ฟ ๐๐ผ ๐๐ต๐ฒ ๐ป๐ฒ๐
๐?
The answer starts with the ๐ณ๐น๐ฒ๐ฒ๐ ๐ฎ๐ป๐ด๐น๐ฒ (ฮฑ). It is the angle between the rope running from the first fixed sheave to the drum fl**ge and the drum's own centerline. See the sketch below.
Get this angle wrong in either direction and the consequences show up fast:
โณ ๐ง๐ผ๐ผ ๐น๐ฎ๐ฟ๐ด๐ฒ (>1.5ยฐ): The rope drifts toward the drum center, skips wraps and leaves gaps that undermine every layer stacked on top.
โณ ๐ง๐ผ๐ผ ๐๐บ๐ฎ๐น๐น (