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Unread 01-11-2018, 10:00 AM
Marston Marston is offline
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What size drive train is your team making?

Hi all! I was wondering which style of drive train is your team planning on doing or have done. Is your team going to fit the maximum size restraints? Which way will you orient your drive train? Will you be doing long bot, wide bot, square bot, or something different?

Thanks!
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Unread 01-11-2018, 10:53 AM
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Re: What size drive train is your team making?

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Originally Posted by Marston View Post
Hi all! I was wondering which style of drive train is your team planning on doing or have done. Is your team going to fit the maximum size restraints? Which way will you orient your drive train? Will you be doing long bot, wide bot, square bot, or something different?

Thanks!
3397 is looking into creating a small robot (smaller than the size restraints) using a mecanum drive, medium height. Not finalized though
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Unread 01-11-2018, 11:30 AM
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Re: What size drive train is your team making?

A longer wheelbase is a stabilizing factor for tall robots (arm or elevator). A small footprint will be useful for getting two or three robots to climb on the dinky little RUNG, or for being able to drive onto the unpredictable ramps that others will definitely be deploying. So, it's really a tradeoff; do you want increased stability, or decreased footprint?
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Unread 01-11-2018, 11:33 AM
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Re: What size drive train is your team making?

I'd also recommend avoiding the boundaries of your size constraints. At the very least, please design your robot to be 1" smaller than the max in every dimension. You will not regret it!
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Unread 01-11-2018, 11:50 AM
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Re: What size drive train is your team making?

We're going tall to put cubes in the scale, and be able to climb from the rung. 99% sure we're building the kit chassis in long configuration (32.3") x 27.5" wide.
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Unread 01-11-2018, 01:56 PM
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Re: What size drive train is your team making?

Were going with 27.5 wide by 32.5 long. Were not quite yet sure how tall wed be but its probably going to be close to the limit.
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Unread 01-11-2018, 02:16 PM
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Re: What size drive train is your team making?

I think we are doing 33 wide and 28 long. We need the width because of how we are pulling the power cubes into our robot. Keeping our weight at the bottom of our robot will be crucial to avoid tipping over since we are planning on doing the climb and scale.
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Unread 01-11-2018, 02:42 PM
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I think we are doing 33 wide and 28 long. We need the width because of how we are pulling the power cubes into our robot. Keeping our weight at the bottom of our robot will be crucial to avoid tipping over since we are planning on doing the climb and scale.
Don't do wide. We did last year and it was awful. The cubes are 13 inches wide. You can go much narrower. The field is not very good for wide robots. There are fairly narrow points between the ramp and switch, and also the null zone.
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Unread 01-11-2018, 02:50 PM
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Re: What size drive train is your team making?

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Originally Posted by ngreen View Post
Don't do wide. We did last year and it was awful. The cubes are 13 inches wide. You can go much narrower. The field is not very good for wide robots. There are fairly narrow points between the ramp and switch, and also the null zone.
The NULL Territory is a safe zone and a little more than twice the width of our robot, so I'm not sure the team will see that as an issue.

The area between the switch and ramp would be more of our problem, depending on our strategy.

Thanks for the heads up. I'll mention the issue to my team tonight.
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Unread 01-12-2018, 01:07 AM
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Re: What size drive train is your team making?

Hey, we are making a 21.75 by 32.75. we do not know our height yet, still have not decided. Also, a 6 cim west coast.
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Unread 01-12-2018, 01:08 AM
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Re: What size drive train is your team making?

Hey, we are making a 21.75in. by 32.75in. we do not know our height yet, still have not decided. Also, a 6 cim west coast.
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Unread 01-12-2018, 09:52 PM
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Re: What size drive train is your team making?

We had originally decided long strategically, but during the initial design review, all of the design subteams revealed their wish that wide would be better to implement our functional requirements. So that was kind of nice and painless. We always do tank drive. 4" wheels were agreed upon for a better approach angle.

Unfortunately now we're split on 4 traction vs 4 traction + 2 omni.

Any opinions on maneuverability?
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Unread 01-12-2018, 09:54 PM
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Re: What size drive train is your team making?

Kit bot in the long orientation. 6-wheel drop center, west coast. Estimated 32x27 or so, but I might still shave another inch off the width.

Originally toyed with the idea of making either a very narrow or generally small bot, but after doing some tests with two 2x4 boards bolted to example square frames stability for reaching the scale or climbing bar is going to be paramount.
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Unread 01-13-2018, 09:29 PM
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Re: What size drive train is your team making?

Quote:
Originally Posted by ngreen View Post
Don't do wide. We did last year and it was awful. The cubes are 13 inches wide. You can go much narrower. The field is not very good for wide robots. There are fairly narrow points between the ramp and switch, and also the null zone.
If you want to bring cubes into the frame perimeter through a gap in the bumpers, 25" is the minimum chassis width - which has the cubes scraping both bumpers on the way in. A wide chassis is also good for stability with a high CoG in a turn. That said, there's certainly validity in having a small fast robot along the same lines as some of the tiny off season STEAMworks bots that can only score via the switch and exchange and is easy for another robot to lift through a ramp or buddy climb and can zip through those tight spaces.
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Unread 01-13-2018, 09:47 PM
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Re: What size drive train is your team making?

We eventually settled on a size bigger than I had hoped for, but which suits our team's goals for this game: 29.5" long, 26" wide. Good luck, everyone!
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