A 2:1 ratio still gives
a fair amount of resistance while allowing more travel with slightly better responsiveness
. Again, the 2:1 ratio is good for the now popular “functional training” exercises where you want a “fast cable” adequate travel.
What does a 1/2 resistance ratio mean?
Keep in mind, that with a pulley system, the actual resistance you feel is different than the selected resistance. These pulleys have a 1:2 resistance ratio, meaning
the resistance you feel is half the selected resistance
(due to the mechanical advantage created by using a pulley).
What does a 2 1 Cable ratio mean?
The cable ratio determines the actual resistance on a cable machine. Higher cable ratio number = lower overall resistance but smaller increments between weight plates. Higher cable ratio = longer cable than lower cable ratio (a 2:1 cable
is twice the length of a 1:1 cable
)
What does pulley ratio mean?
The ratio
tells you how the weight is handled when you pull the cable along the pulley system
. For example, if you have a standard 200-lb. stack, a 4:1 ratio reduces the actual weight you’re pulling to 50lbs. Similarly, a succession of pulleys in a row can increase that weight pull to 400 lbs.
How do you calculate pulley ratios?
There are complicated formulas for determining pulley ratios but in generic, layman terms, simply
divide the driven component (pump) by RPM, the driver component (motor or engine) rated by RPM to get the required ratio
. In the example below, the pump RPM is 1070, for full output, while the motor is 1750 RPM.
How accurate are cable weights?
Let’s start with the weight stacks used in many of the machines.
Most weight stacks are fairly accurate
. Some have been discovered to be slightly lighter than advertised, but this is not the main way you will be fooled. Any variances of this type are not that significant enough to worry the prospective gym member.
How do you calculate pulley load?
You calculate the work by multiplying the force by the distance:
W = F • d
.
How does a gym pulley system work?
One wheel. If you have a single wheel and a rope, a pulley
helps you reverse the direction of your lifting force
. So, as in the picture below, you pull the rope down to lift the weight up. If you want to lift something that weighs 100kg, you have to pull down with a force equivalent to 100kg, which is 1000N (newtons).
Is inspire FTX worth it?
5.0 out of 5 stars
Excellent solution
for a home gym, lots of options. I’ve had this set for a year and a half now, I absolutely love it. After almost daily use, I have found no wear, no faults, everything working like new. It doesn’t take up a lot of space as it sits, but in use you will need some room.
What do the numbers mean on weight machines?
Usually, each plate is marked with a number. On some machines these numbers give
the actual weight of the plate and those
above it. On some, the number gives the force at the user’s actuation point with the machine. And on some machines the number is simply an index counting the number of plates being lifted.
What is a 2 1 mechanical advantage?
This page explains 2:1 mechanical advantage systems. In a 2:1 system,
you pull with approximately half as much force as the weight of the load
. Refer to the overview on raising systems to learn more about mechanical advantage systems.
How can I add weight to my weight stack?
All you need to do is max
out the weight stack by putting the pin beneath the bottom weight-stack plate (the heaviest weight)
. Then you grab a second, longer pin and jam it in the same weight stack, usually under the 35-pound or 45-pound plate. You then literally hang a free-weight plate over that second pin.
Does the size of a pulley matter?
A larger diameter pulley wheel (aka sheave) is technically more efficient than a smaller diameter pulley. But it’s a trade off: a larger pulley has
increased bulk, weight
and cost. … This efficiency increases with really big loads (600 lbs+) and larger mechanical advantage, such as 6:1 and 9:1.
What is the formula for calculating rpm?
How to Calculate Motor RPM. To calculate RPM for an AC induction motor, you multiply the frequency in Hertz (Hz) by 60 — for the number of seconds in a minute — by two for the negative and positive pulses in a cycle. You then divide by the number of poles the motor has:
(Hz x 60 x 2) / number of poles = no-load RPM
.
What is the formula for efficiency?
Efficiency is often measured as the ratio of useful output to total input, which can be expressed with the mathematical formula
r=P/C
, where P is the amount of useful output (“product”) produced per the amount C (“cost”) of resources consumed.
