A program for pulleys that may be helpful.

K

knight_shadow

Joined
Jan 11, 2007
Messages
39
I coded a program for my brother inlaw to help him with the math on pulley RPMs and torque ratios. After reading all the posts in here and see people putting together there own belt grinders and so on I thought maybe you could use this program. This program was written by me and is free to anyone in this forum to use.

Here is a link to the program ( I used a free file hosting site )
http://www.mediafire.com/?sharekey=39e7e82362737fc70c814df2efeadc509ca77ab7934b8070b8eada0a1ae8665a

Once there just click on the file name to download.

The file name is MotorpulleySetup.exe

It has its own installer and uninstaller. It will install just like any other program ( for people that know very little about computers like my brother inlaw this was easer ).
If you have any questions about the app let me know.

Sad to say I started with a basic app and got to much into the coding and made it alittle more advanced then some may need. A simple help is added to the app to give you the basics but I am willing to answer any questions you may have.
 
Some basic info on the interface of the program. The first input box you will see if Drive Pulley. That is the size of the pulley that is attached to the motor. Motor RPM is on the side of the motor. On alot of USA motors ( washing machine motors ) it may be 1725 RPM. Just put the RPM into that field. Object Pulley is the size of the pulley you are driving the motor with ( end pulley ). Drive Pulley ratio and Output RPM are fields given to you as an answer. You can also input Motor Horse Power ( in decimal point ) and get estimated torque. the add a pulley button is if you are using multi pulleys. it will take your output RPM and place it into your motor pulley for you automatically.

There is also a Change type button at the bottom right. This will let you put in your drive pulley size. Motor RPM and then input the RPM you want as an output and give you the object pulley size needed for that RPM.

You can also print and save the output if needed ( this can be very helpful if you use multi pulleys. ). Not sure how helpful this will be to you but it is free to use all the same.

This setup does not give you FPM. It gives you RPM. When I created this program I had no use for FPM as an output. I could recode the program but after doing some searching the conversion can be done simply so I left it out.

RPM X Diameter X Pi/12 = SFM ( surface Feet Per Minute )
Pi = 3.14159265358979323846
To get rough Diameter just measure across the pulley in inches.

Here is a RPM to FPM conversion chart.
http://www.munaco-online.com/rpm_to_fpm.htm
 
Last edited:
After doing some reading I added a few things to my app. I still have not added FPM but I did add a fraction to decimal converter for engine HP and I also added something for belt length. I change the input fields for easer use and so on.

Here is the new app.
http://www.mediafire.com/?sharekey=39e7e82362737fc70c814df2efeadc50e04e75f6e8ebb871

Both will work and they do the same thing. The new one here just makes things simpler with a few addons. As you can see when I write an app I have a problem about leaving it alone and being done :D
 
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