How to calculate mechanical advantage within a progression!

Written By: Lance Piatt

 

A mechanical advantage haul system reduces the effort required to raise a load. The mechanical advantage obtained is based on the pulley effect.

 

1. The pulley effect

If we consider a load suspended on a rope, the rope passing through a pulley above the user, with the user’s hand holding the rope on the other side of the pulley; any force applied to one end of the rope is transmitted to the other end of the rope, or, in this case, to the end of the rope on the other side of the pulley.

If the load weighs 100 kg, it is clear that the user must hold 100 kg on their side to hold the load. The two rope strands each exert a pull of 100 kg, so the pulley supports 200 kg.

Note: this theory is valid for an ideal pulley of 100% efficiency, which does not exist in the real world.In reality, pulley efficiencies range from about 50 % to 98 %.To simplify calculations, this discussion is limited to ideal pulleys.

2. Calculating mechanical advantage in practice

The efficiency (E) of a haul system indicates the force multiplier factor that you can exert on the rope.For example, if you are able to pull 20 kg maximum on a rope with your bare hands, a 3:1 haul system will enable you to raise a 60 kg mass.This reduction is obtained by increasing the amount of rope to be pulled: to raise a mass 1 meter with a 3:1 system, 3 m of rope must be pulled.

The efficiency (E) of a haul system may be calculated by adding the effects of each pulley.

Start by drawing a simple diagram of the system, then show the pulling force F that the hand applies to the rope.

Transmit the force F along the rope by adding the effects of each pulley.

When multiple rope strands are attached to the load (double pulley, rope clamp…), add the forces exerted by each strand.

1:1 HAUL SYSTEM

2:1 HAUL SYSTEM

3:1 HAUL SYSTEM

Note: the advantage of a 3:1 system is its ease of setup and that it can easily be converted to a complex system (7:1) with one additional pulley and some cord.

4:1 HAUL SYSTEM

5:1 HAUL SYSTEM

TTRS & AHD Trilogy Bundle
Twin Tension Rope Systems
Artificial High Directionals

Peace on your Days

Lance

Categories

About The Author:

6,134 thoughts on “How to calculate mechanical advantage within a progression!”

  1. Hi, just required you to know I he added your site to my Google bookmarks due to your layout. But seriously, I believe your internet site has 1 in the freshest theme I??ve came across. It extremely helps make reading your blog significantly easier.

  2. 785768 709040Pay a visit to our website for data about securities based lending and a lot more. There is details about stock and equity loans as well as application forms. 860952

  3. 538822 234655In the event you happen to excited about eco items, sometimes be tough shock to anyone them recognise that to help make unique baskets just for this quite liquids carry basic steps liters associated ceiling fan oil producing. dc free mommy weblog giveaways family trip home gardening residence power wash baby laundry detergent 965987

  4. writing acknowledgement dissertation
    [url=”https://professionaldissertationwriting.com”]writing a dissertation[/url]
    how long is a doctoral dissertation

  5. 104711 363611Should tow line this caravan together with van trailer home your entire family quick get exposed towards the issues along with reversing create tight placement. awnings 604817

  6. Took me time to read all the comments, but I really enjoyed the article. It proved to be Very helpful to me and I am sure to all the commenters here It’s always nice when you can not only be informed, but also entertained I’m sure you had fun writing this article.