YAWT: Why are some cable machines easier than others ? ... pulleys ?

[polm]

For example I use a cable machine for doing weighted cable crunches. My current max is 200 lbs.

Yesterday I used the cable machine at another gym, and my max was 100 lbs.

I havent been back to my old gym to check, but maybe this is because one machine has more pulleys than the other ?

 

[KingNothing]

If I remember physics correctly, each pulley you add multiplies your force but decreases the distance that a given force over a certain time can move the object.

 

[Shockwave]

Originally posted by: KingNothing
If I remember physics correctly, each pulley you add multiplies your force but decreases the distance that a given force over a certain time can move the object.

Is that it? I thought it was each pulley increased distance by a factor of the radius of the wheel, and the total applied force was a factor of all pulleys circumference summed times Pi.
I may be wrong however.

 

[Amused]

Two pulley machines with two access points (one high and one low) are roughly twice as easy as single pulley/access point machines.

At any rate, most machines, cable or lever, have inaccurate weight numbers on the plates. The weight numbers should be used as reference points to that machine only and not from machine to machine.

This is why I prefer free weights. Grab a weight plate and do crunches on a slant board. Unless gravety changes like it does every time I drink too much, you'll always know what you're working with.

 

[RagingBITCH]

Originally posted by: Amused
Two pulley machines with two access points (one high and one low) are roughly twice as easy as single pulley/access point machines.

At any rate, most machines, cable or lever, have inaccurate weight numbers on the plates. The weight numbers should be used as reference points to that machine only and not from machine to machine.

Well said.

 

[Shaftatplanetquake]

Originally posted by: Amused

This is why I prefer free weights. Grab a weight plate and do crunches on a slant board. Unless gravety changes like it does every time I drink too much, you'll always know what you're working with.

I like the addition/edit also.