RPM question - Woodworking Talk - Woodworkers Forum
 
Thread Tools Display Modes
post #1 of 4 Old 08-28-2011, 08:39 AM Thread Starter
Senior Member
 
tcleve4911's Avatar
 
Join Date: Dec 2006
Location: Vermont & Maine
Posts: 1,967
View tcleve4911's Photo Album My Photos
RPM question

I have an old Rockwell/Delta lathe so it doesn't have an RPM indicator.
It has two step pulleys. One on the lathe, one on the motor.
How do I determine what speed I am turning at?
Thanks

Learning more about tools everyday
tcleve4911 is offline  
Sponsored Links
Advertisement
 
post #2 of 4 Old 08-28-2011, 09:15 AM
Senior Member
 
Join Date: Nov 2010
Location: I went back to my private Idaho
Posts: 2,321
View Brink's Photo Album My Photos
Their should be a tag on the motor stating it's rpm.

Then, measure the pulleys diameter.

motor rpm x (chuck pulley diameter/motor pulley diameter) = chuck rpm

As an example: motor rpm is 1750
Motor pulley 2"
Chuck pulley 6"

6/2= .333
1750 x .333= 582 rpm at the chuck

Hope that helps.
Brink is offline  
The Following User Says Thank You to Brink For This Useful Post:
tcleve4911 (08-28-2011)
post #3 of 4 Old 08-28-2011, 09:17 AM Thread Starter
Senior Member
 
tcleve4911's Avatar
 
Join Date: Dec 2006
Location: Vermont & Maine
Posts: 1,967
View tcleve4911's Photo Album My Photos
Thanks, Brink.
That helps a whole lot. I'll do my math this afternoon....

Learning more about tools everyday
tcleve4911 is offline  
Sponsored Links
Advertisement
 
post #4 of 4 Old 08-28-2011, 09:17 AM
Senior Member
 
Join Date: Nov 2009
Location: port st lucie, florida
Posts: 1,239
View del schisler's Photo Album My Photos
Quote:
Originally Posted by tcleve4911 View Post
I have an old Rockwell/Delta lathe so it doesn't have an RPM indicator.
It has two step pulleys. One on the lathe, one on the motor.
How do I determine what speed I am turning at?
Thanks
you need to know the rpm of motor and pully size on the driven or motor pully and the size on the driven one . go here and see if this helps http://www.woodweb.com/knowledge_bas...lculation.html
del schisler is offline  
The Following User Says Thank You to del schisler For This Useful Post:
tcleve4911 (08-28-2011)
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Woodworking Talk - Woodworkers Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome