Calculating Transmission Loss in Rack and Pinion Systems

[Ziv7]

I need to find out the transmission loss in rack and pinion but I can't find any formulas or some general figures...

 

[CWatters]

http://machinedesign.com/archive/co...motors-ball-screws-and-rack-and-pinion-drives

Says up to 97% efficient.

 

[Ziv7]

Thanks, but i think it might be an over estimate as I won't be getting a top of the range rack and pinion.
I was hoping to use the worst case scenario for my calculations

 

[CWatters]

I can find some references to figures like 85-90% but no justification for them.

http://www.parker.com/literature/Literature Files/euro_cylinder/v4/htr-app_1230-uk.pdf

Page 4..

Single, double or multiple rack designs are possible, and overall efficiencies for rack and pinion units average 85-90%.

 

[Ziv7]

Thanks for your help...