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 Reversing weapon belts

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fogdog



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PostSubject: Reversing weapon belts   Wed Aug 24, 2011 12:16 am

Last year we used a belt driven weapon with the teeth of the belt inward. I heard about people flipping the belt inside out and putting the teeth on the outside (smooth side against the pulleys) to reduce the amount of backlash (and motor stress) when hitting an opponent. Thoughts and/or experiences with either option?
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rdubard
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PostSubject: Re: Reversing weapon belts   Wed Aug 24, 2011 5:19 am

Flip your weapon belts. With proper tension they can slip just a little on hard hits, when the weapon is jammed, and on hard startup, saving your motors, ESCs, shafts, supports, etc.

The tricky part is figuring out the center distance.
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Stephen
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PostSubject: Re: Reversing weapon belts   Wed Aug 24, 2011 9:20 pm

yah definitely flip the belt

you could destroy your motors of your belts with the teeth down and thats never good in a bout

it might slip a little but not much if the tension is correct

its the way to go
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fogdog



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PostSubject: Re: Reversing weapon belts   Thu Aug 25, 2011 1:35 am

Thanks for the reply. Is it better to use pulleys with a smooth finish or with some texture (such as those designed to mesh with belt teeth)?
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Stephen
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PostSubject: Re: Reversing weapon belts   Thu Aug 25, 2011 11:22 am

im not really sure we have done both so i would say it doesn't matter at least i couldn't tell the difference
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Alex P. HASD Bots
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PostSubject: Re: Reversing weapon belts   Sun Sep 04, 2011 9:40 pm

from my teams past experience flipping our belts did allow for slip, however it is a major pain to tension them just right. We also noticed a major speed difference going from a slip setup, to a toothed setup. (the toothed being faster). my best advice is if you do go with flipping the belt then use some type of belt dressing to help maintain some grip

best of luck
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fogdog



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PostSubject: Re: Reversing weapon belts   Mon Sep 05, 2011 4:36 pm

One of the reasons we were thinking about flipping the belts is because we have a lathe and can make our own spindles. If the tension is too much or too little, we can just alter or make a new spindle.
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Evan Steeves
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PostSubject: Re: Reversing weapon belts   Mon Sep 05, 2011 4:59 pm

fogdog wrote:
One of the reasons we were thinking about flipping the belts is because we have a lathe and can make our own spindles. If the tension is too much or too little, we can just alter or make a new spindle.

smooth pulleys have less surface area so less contact patch than a toothed pulley however a smooth pulley with traction compound can give higher rpm and less shock if it is tensioned properly i find that toothed pulleys start to create alot of friction if they have high deflection or break 20k rpm.
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rjw
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PostSubject: Re: Reversing weapon belts   Sat Oct 01, 2011 10:43 pm

I think that we kind of pioneered the inverted timing belt idea.....

If you have an adjustable motor bracket, it goes a long way to getting tension correct and NO speed loss compared to teeth down. Also, the cheap neoprene belts grip better than the more expensive ones.

MLEC might have lost last years BotsIq nat's due to bad choice of belt material. We switched from neoprene to another material and belts wouldn;t stay on the pullies. My bad idea and not taking away from Green Mojito....they deserved the win

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rjw
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PostSubject: Re: Reversing weapon belts   Tue Oct 04, 2011 2:40 am

Alex Udanis wrote:
rjw wrote:
I think that we kind of pioneered the inverted timing belt idea.....

Oh thats interesting. I remember robots using inverted timing belts at the 2007 botsiq nationals. Was that you guys?

Nope...seems that no one on this forum knew about it,,,but then again yoiu're special

btw: how's it been going?

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Cody
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PostSubject: Re: Reversing weapon belts   Tue Oct 04, 2011 3:05 pm

Matt gahlager has been doing it on humdingers for awhile, we tried it and didn't see any differences.
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rjw
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PostSubject: Re: Reversing weapon belts   Thu Oct 06, 2011 6:55 pm

An upside down timing belt is just a flat belt, and they have been around since the dawn of time (almost).

I saw Hummdinger in 2008 and it'ss belt wasn't upside down then...or was it? I haven't been keeping tabs on how people wear thier belts....Razz

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AdamC



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PostSubject: Re: Reversing weapon belts   Thu Nov 08, 2012 5:09 am

Hello, I know this is an extremely late reply but, oh well... Back in the fall of 2006 during Humdinger's very first competition we realized that we were going to need to do something different with our timing belt. Every time we had a big hit the belt would break. We ended up reversing the belt to prevent breakage. Actually, for Humdinger's fisrt competition, we were not smart enough to bring a spare belt. We had to duct tape the belt back together. It would last only one hit. Since then we have always reversed the belt for fights, except Humdinger 2 sometimes did run teeth down for printer destruction demos. I tried flipping Chucker's belt teeth down once and the belt snapped also. But when Humdinger 2 and Chucker were designed, they were designed with belt tensioners. Matt didn't seem to need his tensioner. I know he had to use belt dressing. Chucker really didn't need dressing.

But yah, we did bring Humdinger to Bots IQ 2007 that way. Unfortunately for us, our beater broke the very first fight. It must have developed cracks from all the fights at home. We had to weld our beater almost every fight. Hardened S7 doesn't seem to be too great for welding. Somehow we still managed to get 3rd. Amazing.

Humdinger 2 got to do some destruction demos at Mecha Mayhem 2012. I uploaded some videos to the BooyahRobotics youtube channel. I did some slight changes to the design, nothing major. It's setup just for demos. Matt likes to refer to it as Humdinger 1.5...lol
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