Hi guys new to the site, just have a quick question. I'm trying to design a an arm like in a doctors office that holds keyboards or a monitor. I know that they use a gas spring for torsional resistance. I was wondering if anyone could help me get started with the math on something like this.

 

quick response to your quick question...

google can be your friend

http://www.enidine.com/pdffiles/Gas_Springs.pdf

 

This is awesome, thank you. I googled quite a bit looking for info, but I couldn't find anything along the lines of this. I really appreciate it and thanks for the help!

 

I can introduce you something about gas springs,which are helpful to dealing with the problem that you are faces,You can find the formula you are seeking,click this http://www.meet-at-fair.com/se/gassprings.htm.