Posted by Phil Rockwell on February 11, 2005 at 10:12:49:
In Reply to: winch posted by Sarahg on February 10, 2005 at 08:48:10:
What you are working on is called a "level winder." Level winders are available as catalog items. The heart of a level winder is a cylinder with two crossing helical grooves machined into it. The two opposite hand helices meet up at both ends of the cylinder. A series of balls travels in the grooves. Thus, with continuous rotation of the cylinder, you get reciprocating motion of the balls. This arrangement is called a "ball reverser," or "reversing ball screw." Ball reversers are also available as catalog items. The cylinder rotation is driven directly by gears or chain from the drum, so its speed is always correct in relation o the drum speed. You will need to experiment to get the correct speed ratio between the level winder cylinder and the drum. You will also have to be careful about drum width vs. level winder cylinder length.
Two major manufacturers of ball reversers are Flennor and Norco.
Here's a link that may prove helpful:
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