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#1
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Tank tread
Hello, I am from Countryside High school, Clearwater Florida, near Tampa, Team 1368. We are a rookie team and have only gone to nationals a once or twice. Year after year we have been using chain drive system that has been included in the kit, and last year it broke down almost every single game causing us to end up being 83rd out of 88th in the Orlando regional. This year we are experimenting with new drive systems, we have already designed a few systems already including a tank tread design. As we have never used a tank tread design before its difficult to figure out what type to use for the actual tread, i found from browsing through your website that you recommend BRECOflex timing belts, when i arrived at that website i found many types of timing belts and i was hoping maybe you could help me pick out a good style.
Any help will be appreciated. Thank you -Team 1368 |
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#2
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Re: Tank tread
I expect others will respond with regard to the specific brecoflex treads they have used. While I encourage you to investigate the use of treads as an alternative -- they offer many opportunites -- I would suggest that reliability compared to a properly designed chain/wheel drive system might not be one of them.
While it is indeed frustrating to have chains come off in competition, that is an exceedingly rare event if the chains are properly tensioned and the sprockets are properly mounted. I believe there are some powerpoint presentations in this regard on the FIRST web site. http://www.usfirst.org/community/frc...t.aspx?id=1108 might be a good place to start. I suspect you will find belts/treads to be at least as challenging as chain to align properly and get a reliable drive system. That's not to say you shouldn't investigate treads... go for it... but consider that the vast majority of teams have chains and sprockets similar to those in the KOP and they work very reliably. Jason |
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#3
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Re: Tank tread
Tank drives are very cool but I wouldn't try to build one in a six week period from scratch. The teams that are successful with these have spent many hours in R&D.
Stick with the tried and true but be careful with the execution. Chain and wheels are simple and near bulletproof when done correctly. Take next summer and fall and experiment with the tank tracks. |
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#4
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Re: Tank tread
well we have already got the design down, we were just wondering what treads to use
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#5
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Re: Tank tread
Team 48 has used treads 2 out of the last 3 years and we have had allot of success with them. If tensioned properly and if you have a lowered center point to reduce skidding and increase turning they should never fall off and they will rarely break. we have used the same style twice now and it works well, it ts the TK10-K13 pulley style with the self aligning groove,and the TK10-K13 Belt profile to match. we have also used two different backing materials, in 2004 when there were slick plastic topped platforms to climb onto we used a Linatex (Red) backing, in 2006 when it was mostly carpet we used the supergrip (Green or Blue) backing to dig into the carpet.
http://www.brecoflex.com/?CATID=1&SC...ENID=22&BMID=2 http://http://www.brecoflex.com/?CATID=1&SCATID=6&SMENID=22&BMID=5 http://www.brecoflex.com/?CATID=1&SC...NID=11&PURA=21 *Do only if you have the time* we have also transfered our tread system from 2004 to 2006 in form of a module, for ease of replacement of broken treads. |
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#6
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Re: Tank tread
Just a point of inquiry:
Why not use just a 6 wheel tank DRIVE, but without the treads? We've (25) been doing that for the past couple of years and have met with very pleasant results. The problem with treads is that they're really unnecessary unless you're climbing some kind of stairs or what not. I've seen many teams with tank treads get pushed sideways and then end up burning up and/or tearing their treads to shreds --leaving much to be fixed. |
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#7
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Re: Tank tread
I'm curious as to how the KoP drive failed last year. It is one of the most reliable drive-trains available, when properly constructed. It may not have the speed or flashiness of a shifting transmission, the agility of an omni-drive, or the contact area of treads, but it definitely works.
A properly constructed tread system is usually very reliable as well (but even the some of best teams have sometimes had trouble with belts snapping). That said, any issues that arise are often worse in belt drives than chain. For example, it's far harder to change the length of a belt than it is the length of a chain if the sprockets are positioned wrong, etc. If you feel a tread drive is the best solution for your design, and you feel confident about building it, go ahead. But I just give you my cautions that they are no easier to build than the KoP drive system. |
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#8
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Re: Tank tread
Quote:
If you do decide to go with a tread system, make sure you have plenty of extra belts as you'll probably be needing them. Like Sean said, just take care in making such a decision. |
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#9
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Re: Tank tread
our chains broke quite a bit last year, we dont how, but it might be the tension i believe.
But right now our team is split into 3 design team, 1 is for tank tread, 1 is for a 4 wheel drive system (with each wheel having its own gear box) and 1 for another design we like to call the omni drive design, I am currently working on both the tank tread and omni Drive. ive included a picture of my omni drive design, not the greatest in detail or any dimentions, but its something just to go on the motors attached to the drive wheels are the really big ones which you were only allowed 2 of and the ones attached to the omni wheels are the smaller ones ![]() |
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#10
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Re: Tank tread
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#11
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#12
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Re: Tank tread
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#13
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Re: Tank tread
Track drive / tank treads have there good points and bad.
On a light unit the tracks will tend to come off the idler wheels... and they will be a lot of adjusting to make them work right. They great for climbing ramps and pushing other bots out of your way (if you got the motor and gearing for it) but other than that there just a headache. I think speed gonna be needed for this game... wheels the answer. |
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#14
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Re: Tank tread
if you are going to use a tank tread desing you mite want to keep in mind that it is very hard to ketp a tank tread on with out giving it tooo much slack. also im couries on how you plan to trun your robot.
kyle from (team 1094) |
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#15
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Re: Tank tread
If your Robot is made correctly, and centered in it's weight the robot should have no problem turning around in a 360 degree....
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