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Unread 28-12-2008, 18:09
Unsung FIRST Hero
JVN JVN is offline
@JohnVNeun
AKA: John Vielkind-Neun
FRC #0148 (Robowranglers)
Team Role: Engineer
 
Join Date: May 2001
Rookie Year: 2000
Location: Greenville, Tx
Posts: 3,159
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Re: pic: Dual FP gearbox

Quote:
Originally Posted by CraigHickman View Post
Listen to John instead of me. He's a real Engineer, and knows a TON more than I do.

(out of curiosity, how is there more efficiency from more space? I'm visualizing the rounded tooth profile rolling across another tooth, and not seeing how more space can help this. Care to clarify?)
Someone more experienced than me can chime in if I am incorrect...

It was once explained to me that standard tooth profiles are NOT designed to run "happy" initially. They are designed to wear-in over time. Unfortunately for us, FRC Robots have a ridiculously short lifespan compared to more "industrial" applications. Adding a few extra mills to the axle spacing just serves as a replacement for this true wear-in.

I'm not sure if this is true, or if it is just some urban legend. I know that the person who told it to me is someone I trust and respect VERY much. I also know you can "feel" the difference when spinning a gearbox by hand.

The most important stage to reduce drag on, is the initial stage of the gearbox. This drag has the greatest effect on the output.

-John
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In the interest of full disclosure: I work for VEX Robotics a subsidiary of Innovation First International (IFI) Crown Supplier & Proud Supporter of FIRST

Last edited by JVN : 28-12-2008 at 21:13.
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