Acme screw thread - friction

[tdsdesign]

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.

 

[Irwin]

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Our company provides Excel based software that calculates characteristics of ACME threads.&nbsp;&nbsp;<br><br>In addition, if you enter a coefficient of friction, it will calculate a drive efficiency, and a back drive efficiency.&nbsp;&nbsp;This can be used to calculate the torque you are interested in.<br><br>Email for demo&nbsp;&nbsp;&nbsp;:&nbsp;&nbsp;<A HREF="mailto:webgear@home.com">webgear@home.com</A><br><br>or visit our website&nbsp;&nbsp;&nbsp;<A HREF="

http://homepages.msn.com/CorporateWay/webgearsoftware/webgear.htm"

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[tdsdesign]

I know how to calcaulate the required torque.&nbsp;&nbsp;My question is,&nbsp;&nbsp;what friction coefficient should I use? The screw is steel and the nut is bronze. <p>Bob Kennedy<br><a href=mailto:BobK@tdsdesign.com>BobK@tdsdesign.com</a><br><a href=

http://www.tdsdesign.com>Turnkey

Design Services</a><br>Visit our web site for "How to design a gear pump" tips!

 

[Irwin]

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

 

The coefficient of friction will depend on whether you have cut threads, or rolled threads, and depends on the lubrication used.<br><br>In general, a greased rolled steel thread with a steel nut (tapped thread) would have a coefficient of friction of approx. .13.&nbsp;&nbsp;Using a brass nut with a tapped thread would be about .11.

 

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.