305 Koehring Build Start

[9W Monighan]

Is that pipe thread? If so, you may want to try to remove the sharp "V" with a round file so the wire rope will not get frayed. Interesting idea using tapered pipe thread because on some of the 1:1 machines the hoist laggin is tapered so the ropes feet per minute increases as the hoist goes up .
Referring to my dragline; I have both LH and RH threads that I cut with a tool that I ground to a radius to conform to the wire rope. I figured out how many wraps ( threads per inch with room between) around the circumference I would need with a couple extra to have enough to hoist and drag in without any overlaps or running the hoist line off the drum. There actually wasn't too much figuring because I was building to the exact pitch diameters (in scale) as the 1:1 machine.

Hoist Laggin being cut on my lathe