Tank Treads

[Greg Perkins]

www.brecoflex.com

amazing belts, we have run all the weeks of testing, a regional, an soon to be like 4 offseasons on our first set. They have some amazing traction, we were never pushed at BAE. they are also self tracking to prevent throwing belts.
http://www.chiefdelphi.com/forums/pi...&quiet=Verbose

[cazbar171]

which item are those in the catalog?

[Pat Roche]

The biggest thing to keep in mind with tracks is the strength of the track. You don't wanna be blowin your belts. I suggest the brecoflex tracks also. Our team had quite a large amount of success with them this season. They are easy to work with and have awesome traction...almost too much traction. You just gotta be careful how much you put on the ground. In the past weve also used timing belts. They are okay but I'd take the brecoflex tracks of them anyday.

-Pat

[aaronbr28040]

Originally Posted by Greg Perkins

www.brecoflex.com

amazing belts, we have run all the weeks of testing, a regional, an soon to be like 4 offseasons on our first set. They have some amazing traction, we were never pushed at BAE. they are also self tracking to prevent throwing belts.
http://www.chiefdelphi.com/forums/pictures.php?s=&action=single&picid=6139&direction =DESC&sort=date&perrow=4&trows=3&quiet=Verbose

What series and size of belts did you use from brecoflex? also did you have any problems turning on the carpet with the treads?
-Aaron

[Greg Perkins]

we did have a problem turning...however the reason was we had so much of a footprint on the carpet. we easily fixed that by increasing the center idler pulley of our drive. we are now able to turn on a dime and have an amazing amount of torque.

as for the series, ask Pat (team134guy) he should know. i dont know off the top of my head

[Cory]

According to my handy dandy Brecoflex binder, Linatex, Super grip, Correx gum, PVC Blue, Polyurethane, and a few others have the highest CoF's.

I could go through the whole catalog and tell you what your options are, but that'd take way too much time

Go to www.brecoflex.com and order one of their free product catalogs. They'll send you a binder with whatever inserts you choose. They sent me mine in two days, if I remember correctly, and they come with a wealth of information.

[Gene F]

We used Brecoflex as well. We used used two "bogy" wheels on each track toward the center of the bot that were about 1/8 of an inch lower that the others. This greatly improves turning. We also used spring loaded tensioners to keep the tracks tight rather than having one sliding wheel that you lock in place. We've used this system for two years now and never had a belt come off or break.

[Pat Roche]

Originally Posted by Greg Perkins

we did have a problem turning...however the reason was we had so much of a footprint on the carpet. we easily fixed that by increasing the center idler pulley of our drive. we are now able to turn on a dime and have an amazing amount of torque.

as for the series, ask Pat (team134guy) he should know. i dont know off the top of my head

I couldn't find a series number. I believe its a custom belt so this is what we have. We used a PVC base backed 75mm wide w/ I believe a polyurethane timing belt. We got the self aligning tooth assortment w/ two pulleys to match. Def use the pulleys. Theyre designed for this track and will save you some machine..SOME they are heavy so youll have to take some out. I'm not sure on the length....but you can figure out what you need.

You can use this catalog though. The selection is nearly endless, you can mix and match til you find what you like.

BTW we did have trouble turning. My suggestion is put a larger center idler in to help reduce the footprint. We went w/ i believe 4 one hundreths of an inch.

To keep tension we used a piece of threaded rod with the axle. The base was slotted so it could slide. Then just double nutted it. Illustrated below. n=nut O=axle

n
---
|
|
n
n
O
n
n
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---
n







-Pat

[dddriveman]

Originally Posted by Greg Perkins

we did have a problem turning...however the reason was we had so much of a footprint on the carpet. we easily fixed that by increasing the center idler pulley of our drive. we are now able to turn on a dime and have an amazing amount of torque.

as for the series, ask Pat (team134guy) he should know. i dont know off the top of my head

What exactly do you mean when you say you reaised the center pulley to decrease the footprint. IF you would like i can include a CAD drawing of what i have in mind as far as how we want to lay things out.

[Greg Perkins]

yes if you looked at the side of the bot, the middle idler pulley was set about a half an inch below the other two pulley, ccutting the footprint in half but making it turn

[Cory]

Nobody has mentioned cost yet, surprisingly. Just a belt can set you back around $200, if I remember correctly, and the pulleys for the belts will cost you a pretty penny as well. Most teams who use treads end up needed more than one belt obviously, since they tear, wear down, etc.

All this adds up to quite a bit, and can be very prohibitive for some teams.

Cory

[Pat Roche]

Originally Posted by Cory

Nobody has mentioned cost yet, surprisingly. Just a belt can set you back around $200, if I remember correctly, and the pulleys for the belts will cost you a pretty penny as well. Most teams who use treads end up needed more than one belt obviously, since they tear, wear down, etc.

All this adds up to quite a bit, and can be very prohibitive for some teams.

Cory

Yes the brecoflex will cost you. But these belts are built specifically for this application. They are built to last. We are still on our first set of belts. We've gone through practice and testing, demos a competition and within the next month and a half two more. We are comfortably within the belts working limits. They are very durable belts (least the set we are using).
You really gotta look at your application and and cost benefit relation.

-Pat

[Cory]

Originally Posted by T134guy

Yes the brecoflex will cost you. But these belts are built specifically for this application. They are built to last. We are still on our first set of belts. We've gone through practice and testing, demos a competition and within the next month and a half two more. We are comfortably within the belts working limits. They are very durable belts (least the set we are using).
You really gotta look at your application and and cost benefit relation.

-Pat

They may have worked fine for you, but they really aren't built for this application. They're built for material handling, in factories, etc. We often put tons of torque through them, and much more wear than they will ever see in a factory.

I know for a fact that teams like 226 and 61 have torn multiple treads in half until they got some super reinforced version of the belts for like $300 if my memory serves me correctly.

I have heard from multiple teams that they have had to replace their treads at least every competition, especially last year with the cheese grater ramp, which adds up to a lot of money.

Personally, I think the decision to use tracks or not comes down to money, more than anything else.

[Pat Roche]

Originally Posted by Cory

They may have worked fine for you, but they really aren't built for this application. They're built for material handling, in factories, etc. We often put tons of torque through them, and much more wear than they will ever see in a factory.

I know for a fact that teams like 226 and 61 have torn multiple treads in half until they got some super reinforced version of the belts for like $300 if my memory serves me correctly.

I have heard from multiple teams that they have had to replace their treads at least every competition, especially last year with the cheese grater ramp, which adds up to a lot of money.

Personally, I think the decision to use tracks or not comes down to money, more than anything else.

I agree whole heartly in what your saying. One of the biggest things with tracks is that you need to make sure that you have attiquit(spl?) belts. I think the belts we used this year would have probably shredded last year. You have gotta match the right belt to the application. I know I've seen alot of teams use too thin of a belt (specifically brecoflex but im sure there are others) and watched it tear in half. Obviously it wasnt strong enough for the job. We used a 75mm belt. Thats a fairly wide belt that your less likely to tear. There is always the possiblity of tearing. Thats a part of the cost benefit relationship.

SO to my point i agree with you cory.

-Pat

[BillyGoats]

Originally Posted by Cory

They may have worked fine for you, but they really aren't built for this application. They're built for material handling, in factories, etc. We often put tons of torque through them, and much more wear than they will ever see in a factory.

I know for a fact that teams like 226 and 61 have torn multiple treads in half until they got some super reinforced version of the belts for like $300 if my memory serves me correctly.

I have heard from multiple teams that they have had to replace their treads at least every competition, especially last year with the cheese grater ramp, which adds up to a lot of money.

Personally, I think the decision to use tracks or not comes down to money, more than anything else.

Yeah 300 is kinda low closer to 400 i belive for a set. We have still torn those belts but the center stays connected so that its alright that the out side tore. The bad part is we would rather break a track then burn out a moter. Throught just testing automode last year and kept hitting the side the moters where really hot. We did not run with them becuase if we had to fight for the top they would not slip at all and our moters would burn out.

We just use different traction. There are four kinds. Slicks, Red Slicks (Not thick red on the track), Thick Red (Thick red on the track) and Green (The most traction you will ever need). Last year was good for the thick read. Did not mess them up. Once we tore one it sliced the red slick to peaces. This year the thick red was awsome! Great on the surface to climb!

My adivise. Dont go with the Green unless you have the solid center. Go with either the Slick Red ones or the Thick Red ones. Having a pair of just slicks is a good a idea for emergencrys.

Check out our web site at. www.valleytech.k12.ma.us/robotics