pic: FRC 1771 Drivetrain

[sdcantrell56]

Actually belts stretch much less than chain. In multiple posts by team 125 they talk about there belts not stretching at all after initially tensioning them. they rely on kevlar belt which is very strong stuff. The only positive I see to the chain is that it is easier to change if it breaks. In all other aspects, belt is the superior solution.

[sdcantrell56]

I forgot to post the gear ratios so here goes. The first stage is 12 to 48 reduction, and then the second stage is either a 15 to 60 or 30 to 45 reduction.

[Dancin103]

Other than needing to loose a few pounds, i would say it looks good. Keep up the good work.

[R.C.]

Originally Posted by Brandon Holley

Thanks for the shout out akash.

While I am no expert, I did spend a considerable amount of time this past season working with belts. We used .200" pitch, .375" wide kevlar reinforced timing belts from www.sdp-si.com. We finally had a belt go down after the beantown blitz this year (2 regionals and 2 off-season events).

The thing about a belt is even though ours were kevlar reinforced, they are just plastic teeth. Keeping them tight will help a considerable amount, and I am pretty sure you guys did to have the belt(s) last as long as they have.

http://en.wikipedia.org/wiki/Fatigue_(material) <---- FATIGUE.

Fatigue is basically repeated stress over a relatively long period of time. Even though your belts may not have seen any greatly large shock loads, seeing small loads over an entire FIRST season probably fatigued the material in the belt enough that it finally broke.

Congrats on making it this far into a season before having to change them!

Hope it helps.

Brando

My bad, i was talking about fatigue of the belt. They are just plastic, belts are great if you can use them and chain is just a tad bit easier to maintain and good luck with whatever you go with. BTW, nice cad job.

[sdcantrell56]

Im hoping I can get this drivetrain under 30 lbs. I havent made one yet that could actually function that was that light. Im working on a single speed version in case there is no need for a shifter like this past year.

[Cory]

Originally Posted by Dancin103

Other than needing to loose a few pounds, i would say it looks good. Keep up the good work.

35 pounds is a very admirable weight for a rolling drivebase. Very few teams have made theirs lighter.

[sdcantrell56]

I don't know of any place to purchase 5" plastic wheels from other than colson wheels which are not hey keyed and which do not allow for tread attachment. Also the price of $70 is not per wheel that was the approximate price that itwould cost us to make 12 wheels, enough for 2 robots.

Has anyone actually tried broaching UHMW or any plastic for that matter? I would think it wouldn't be a problem but if that is not the case then I have to change my plan.

I agree and was under the assumption that anything under 35lbs or even 40lbs is a light drivetrain. I now have 2 drivetrains designed under 35lbs, one cantilevered and the other using plates and standoffs.

[Madison]

Originally Posted by Cory

35 pounds is a very admirable weight for a rolling drivebase. Very few teams have made theirs lighter.

Our '08 drivetrain was 35 lbs. with electronics. Making it lighter would require so much additional work that it's probably not worth it, but that doesn't mean we're not trying.

Of course, it's quite a bit easier to hit these low weights when you drop a CIM motor or two.

[=Martin=Taylor=]

Originally Posted by M. Krass

Our '08 drivetrain was 35 lbs. with electronics. Making it lighter would require so much additional work that it's probably not worth it, but that doesn't mean we're not trying.

Of course, it's quite a bit easier to hit these low weights when you drop a CIM motor or two.

...and the pneumatics.

[sdcantrell56]

Exactly. If we dropped a cim per transmission this would automatically be 5.5lbs less. Also the spur gear style transmission is heavier than a dewalt. Additionally this frame has more metal than yours. It is true we could possibly shave ~1-2lbs out of the frame, but the amount of machining might not be worth it if we know well ahead of time that we will make weight. A ~30lb drivetrain is imo very light particularly with a 2 speed transmission and 2 cims.

I am working on an updated version that uses custom hubs in the wheels and that has some more details added and Ill work on getting it up soon.