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sidestep
01-19-2007, 07:18 AM
I was just wondering how the laserfibre dropweight system gets the same tension everytime regardless of the angle the tension rod rests.

predrag
01-19-2007, 07:19 AM
I was just wondering how the laserfibre dropweight system gets the same tension everytime regardless of the angle the tension rod rests.

If you go to their site there is an explanation.
It is a lever system, so it keeps the static momentum same.

Regards, Predrag

jbs24
01-19-2007, 07:52 AM
It's more an issue of Torque.
The torque of the dropweight vs. the torque of the string pulling back on the drum/gripper.
Most dropweights have a drum, so it's a constant radius and the string can only exert a constant torque against the dropweight. Decreasing the radius of the drum would mean the string exerts less torque, and the dropweight is more effective(this is useful if the dropweight is not horizontal). By changing from a drum to more of a cam with the exact shape to balance the torque no matter what angle the dropweight arm is at, you are no longer required to get the arm nearly horizontal.
It's a clever concept and not too difficult to design the cam. From their wesite, their design looks a little more complicated than a cam, but the same principle of changing the distance from pivot to string.