Team 3495 Drivetrain teaser

[JPBlacksmiths]

Belts? No chain? Wow, ok. Not sure if your are aware of this but belts slip under a lot of pressure, chain is much more reliable.

[Knufire]

Originally Posted by JPBlacksmiths

Belts? No chain? Wow, ok. Not sure if your are aware of this but belts slip under a lot of pressure, chain is much more reliable.

Source? Proof?

[JPBlacksmiths]

Originally Posted by Knufire

Source? Proof?

experience

[Chris is me]

Originally Posted by JPBlacksmiths

experience

You're really going to need to post more information than that, about your experience. How your belts were used, were they tensioned, how, what drivetrain configuration, etc.

Belts should not "slip" in normal operation when properly configured, and hundreds of teams have run successful belt drivetrains at this point. If you're going to make sweeping generalizations, at least back them up with a post longer than a single word.

[orangemoore]

Originally Posted by Chris is me

You're really going to need to post more information than that, about your experience. How your belts were used, were they tensioned, how, what drivetrain configuration, etc.

Belts should not "slip" in normal operation when properly configured, and hundreds of teams have run successful belt drivetrains at this point. If you're going to make sweeping generalizations, at least back them up with a post longer than a single word.

+1.

[Bruceb]

keep in mind that when the front wheel goes up the back wheel goes down effectively RAISING your bumper relative to the bottom of your robot.
Mind your bumper zone

[Valkonn]

@Bruceb We did keep that in mind, the bumpers will never be below 4 inches when actuating.

[bEdhEd]

Originally Posted by JPBlacksmiths

experience

And how was this experience?

In 2010, my rookie season, we used belts for our drive system. For some reason, our current Engineering Director opted for the worst possible choices for a belt driven drive system. From what I remember, the belts we had were no more than 3/8" wide and felt more "plasticy" than rubbery. We also used plastic timing pulleys. Our tensioning system consisted of delrin pegs that could be tightened down onto the belts.

This system was so awful and gave us so many headaches that we converted it to chain. We also stripped a few belts. THAT was an awful experience.

In 2011 I was elected Engineering Director and vehemently was against using belt for the drive system, because of my "experience."

In 2012, a student that I referred to join the year before took my place as Engineering Director, and he didn't use belts either. The big difference in that drive system that year is that it was a drop center WCD sliding bearing block tensioned system. This allowed us to tension chain without plastic pegs.

Because of this, we decided to give belt another chance after the season. We switched out the chain for belt. This time around, we used aluminum timing pulleys and belt that was around 1" wide and much thicker than the pathetic belts we used in 2010.

In 2013, We were so satisfied with our results using belt and tensioning that we started of the season using a belt driven system. We went on to win our first two winner banners ever, and as the drive coach of that year, I can testify to the aggresive defense we played at Colorado in order to win. Not once did our pit crew have to fix or replace anything on our drive system. They were actually bored since the rest of the robot barely broke either, and our disc shooter was belt driven as well.

"Experience" is only valuable if it results from continuous trial and error. I can't assume that your experience is limited to only a few unfavorable attempts, but when it comes to belt, I have a feeling that your experience was with a system that could have been built better.

[mrnoble]

Originally Posted by bEdhEd

as the drive coach of that year, I can testify to the aggresive defense we played at Colorado in order to win.

Testify brother. Since my team was on receiving end of your belt drive defense in the match you linked, I can also testify. It was strong enough to break our gearbox in that match. Neither belt nor chain is superior; it depends on the application, and on how well you build it.