Google Answers Logo
View Question
 
Q: calculate rpm for two hydraulicly driven motors with given information ( Answered 5 out of 5 stars,   0 Comments )
Question  
Subject: calculate rpm for two hydraulicly driven motors with given information
Category: Science > Physics
Asked by: ptonyc-ga
List Price: $10.00
Posted: 23 Mar 2005 11:41 PST
Expires: 22 Apr 2005 12:41 PDT
Question ID: 499272
Determine the maximum speed in rpm of two hydraulicly powered motors A , B
using the following information:
Electric motor that drives hydraulic pump rpm = 1750
Electric motor drive pulley = 3 3/4" diameter
Hydraulic pump displacement = 6.0 GPM @ 1200 rpm
Hydraulic pump pulley = 5 1/4" diameter
Motor A displacement = 10 cu inches
Motor B displacement = 3 cu inches
I need to find:
Motor A max rpm___________
Motor B max rpm___________
Answer  
Subject: Re: calculate rpm for two hydraulicly driven motors with given information
Answered By: redhoss-ga on 23 Mar 2005 16:35 PST
Rated:5 out of 5 stars
 
Hello ptonyc, here is the solution you require:

First we must determine the speed at which the pumps are driven.

RPM of pump = 1750 x (3.75/5.25) = 1250 

Since the 6.0 GPM is given at 1200 RPM we must calculate the delivery
rate at 1250 RPM.

GPM of pump = (1250/1200) x 6.0 = 6.25 GPM

Converting GPM to cubic inches per minute.

6.25 gal/minute x 231 cubic inches/gal = 1,444 cubic inches per minute

Now we can calculate the RPM of the two motors.

Motor A: 1,444 / 10 cubic inches per revolution = 144 RPM

Motor B: 1,444 /  3 cubic inches per revolution = 481 RPM

Please let me know if you don't understand anything I have done. Ask
for a clarification and I will try and explain further.

Redhoss
ptonyc-ga rated this answer:5 out of 5 stars and gave an additional tip of: $10.00
We are setting up the said pumps and motors and will test final rpm
with a hand tachometer on Saturday, March 26, I will advise what
actual hand tach tests out at.  I don't know if your calculations will
come out correct but I do believe it will be close.  Thank you so
much!

Comments  
There are no comments at this time.

Important Disclaimer: Answers and comments provided on Google Answers are general information, and are not intended to substitute for informed professional medical, psychiatric, psychological, tax, legal, investment, accounting, or other professional advice. Google does not endorse, and expressly disclaims liability for any product, manufacturer, distributor, service or service provider mentioned or any opinion expressed in answers or comments. Please read carefully the Google Answers Terms of Service.

If you feel that you have found inappropriate content, please let us know by emailing us at answers-support@google.com with the question ID listed above. Thank you.
Search Google Answers for
Google Answers  


Google Home - Answers FAQ - Terms of Service - Privacy Policy