×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

#### Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

(OP)
From Where can i get info about the mechanical advantages that we get from different configurations of pulley?
Replies continue below

### RE: Mechanical advantage from pulleys

The torque at each pulley will vary with the ratio of the pulley pitch diameters.

### RE: Mechanical advantage from pulleys

The mechanical advantage gained from a -set- of pulleys (such as a block and tackle) will most commonly be determined as follows:
'cut through' the center of all the cables - and count how many total cables (N) are being used (including the 'input' cable)
Mechanical advantage will (usually) be (N-1)/1

It is quite possible to create unusual configurations, though, with very different advantages.  For any out-of-the-ordinary situations, it is best to carefully examine the specific actions taking place.

Curmudgeon

### RE: Mechanical advantage from pulleys

How is the Mechanical advantage of a gear system found?

### RE: Mechanical advantage from pulleys

With gears or sprockets, simply count the teeth
of each gear, then devide. A 10 tooth gear driving
a 60 tooth gear wil have a ratio of 6:1. With pullys
the pitch diameter must be found & used. If your
assembly is not accessible, you can rotate the assy.
and count the # of turns of the input shaft needed
to rotate the output shaft 1 turn.

### RE: Mechanical advantage from pulleys

Is this related to rope hoist and hook mechanism?

#### Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

#### Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!