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Unread 16-03-2016, 11:21
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JohnFogarty JohnFogarty is offline
FTC, I have returned.
AKA: @doctorfogarty
FTC #11444 (Garnet Squadron) & FRC#1102 (M'Aiken Magic)
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Re: PCH District: Albany & Dalton Predictions

If you have a question about why 4901 had issues this season I'd be willing to discuss them in a PM. It had nothing to do with how I teach defensive driving strategy.

Quote:
Originally Posted by Anupam Goli View Post
Believe me when I say this, because I'm trying to be sincere:

I really hope the team understood the engineering and design considerations behind a Chain-in-tube setup We're doing a custom 10WD with Center-Center Chain-In-Tube, and we've already replaced both rails on our competition bot (one had a failure, and we just decided to replace the other while we were at it) during our unbag time this week. We're part of the reason Vex is out of stock of #25 16T sprockets, because we must've ordered 80 of them so that we could have enough for 2 robots, and 2 entire sets of rails to swap on the fly during competition. The Chain-in-tube is a beautiful work of engineering, and when it's designed properly it protects you from chain breaks. Even one forgotten spacer can leave you dead on the field, and were it not for our frame dimensions allowing us to run some chain outside of the tube, we may have had a rough saturday morning at the Columbus event. I really hope they put in the same consideration and effort into making spares and are ready to replace them when needed; especially in a game like FIRST Stronghold.
Question. Why did your Chain-in-tube need spacers in the tube?

Both of my teams used a solution based on the 221 systems simple tube chassis and used 221 systems double 17 tooth hex bore sprockets. When placed in the tube between two bearings there is no room or need for spacers.

Not sure what your team did differently that lead to your issues.
5632 discovered issues in their drive chain weeks ago and since replacing it we've been able to drive for hours straight without breaking. The issue we had stemmed from not using high strength 25 chain. We have replacements ready to go regardless.
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John Fogarty
2010 FTC World Championship Winner & 2013-2014 FRC Orlando Regional Winner
Mentor FRC Team 1102 M'Aiken Magic
"Head Bot Coach" FTC Team 11444 Garnet Squadron
Former Student & Mentor FLL 1102, FTC 1102 & FTC 3864, FRC 1772, FRC 5632
2013 FTC World Championship Guest Speaker
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