Plastic Gear Life Calculations

[VELCROW]

Anyone have a good source for doing plastic gear life calculations? Its a few oz-inches of load, 8 hrs a day for 2 years, steel on acetal, only 120 RPM or so.

Thanks,

Steve

 

[TVP]

Ticona, manufacturer of Celcon, is one source:

http://www.kmsbearings.com/pdf/Celcon_Design Guide_3.9.07.pdf

 

[unclesyd]

Here is a site that has some information on the gdsign of plastic gears.

http://www.sabic-ip.com/webtools/toolsHomePage.faces

 

[loughnane]

We had Kleiss Gears do a presentation here a while ago. They seem to be (and I've heard that they are) the rockstars of plastic gears.

They gave us a peek at some of their software, and it takes into account more than you could hope to find just perusing the web looking for calcs.

If your looking at production, it's worth checking them out.

Chris Loughnane - Product Design

http://www.pdnotebook.com

http://www.twitter.com/DesignNotebook

 

[VELCROW]

Thanks for the input. The Celcon had a formula and a table for a few flavors of their materials. (The formula has F in it but never defines F, I assumed it was f, which was defined but not used). The sabic website has a good calculator, but the allowable stress went up as the desired cycles went up, (the design fails at 1000 cycles but passes at 1 million) so I am a little skeptical.

I'll keep looking and post back if I find anything better.