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Acme screw thread - friction

Acme screw thread - friction

Acme screw thread - friction

(OP)
Does anybody have any friction data for acme screw threads? I have a 1/4-16 double lead screw thread and want to compute the torque required to move the screw.

RE: Acme screw thread - friction

Try to use the next softwares on this site:
www.pwr-tools.com

Or try to find any other on the www.freeware.com
                                               www.shareware.com
                                               www.simtelnet.com
                                               www.download.com

RE: Acme screw thread - friction

Our company provides Excel based software that calculates characteristics of ACME threads.  

In addition, if you enter a coefficient of friction, it will calculate a drive efficiency, and a back drive efficiency.  This can be used to calculate the torque you are interested in.

Email for demo   :  webgear@home.com

or visit our website   http://homepages.msn.com/CorporateWay/webgearsoftware/webgear.htm

RE: Acme screw thread - friction

(OP)
I know how to calcaulate the required torque.  My question is,  what friction coefficient should I use? The screw is steel and the nut is bronze.

Bob Kennedy
BobK@tdsdesign.com
Turnkey Design Services
Visit our web site for "How to design a gear pump" tips!

RE: Acme screw thread - friction

Last time I wrote some sites. I think you will find a program with DATABASE.
By the way the Lubricated Bronze-Steel friction coeficient is appr.: 0.16

Irwin

RE: Acme screw thread - friction

The coefficient of friction will depend on whether you have cut threads, or rolled threads, and depends on the lubrication used.

In general, a greased rolled steel thread with a steel nut (tapped thread) would have a coefficient of friction of approx. .13.  Using a brass nut with a tapped thread would be about .11.

RE: Acme screw thread - friction

I WANT TO USE ENGG PLASTICS FOR BEVEL GEARS.LOAD 400 KG.SPEED OF ROTATION 25 TURNS PER MINUTE.FREQUENCY AFTER EVERY TWO HOURS.AMBIENT TEMP.
PLEASE SUGGEST THE MATERIAL.

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