Chief Delphi - To Strafe or not to Strafe

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Chief Delphi (http://www.chiefdelphi.com/forums/index.php)

- General Forum (http://www.chiefdelphi.com/forums/forumdisplay.php?f=16)

- - To Strafe or not to Strafe (http://www.chiefdelphi.com/forums/showthread.php?t=132384)

lark95

10-01-2015 22:42

Re: To Strafe or not to Strafe

Quote:

Originally Posted by MrJohnston (Post 1425250)

We are looking at some possibilities with omni wheels... The increased ability to turn (over a tank system) is appealing.

Last year we used an 8 wheel tank drive with 4 traction wheels in the center and 4 omni wheels on the outside. It worked very well and was one of the smoothest drive trains i have ever driven, it was just incredible:D .

JorgeReyes

11-01-2015 01:07

Re: To Strafe or not to Strafe

Quote:

Originally Posted by lark95 (Post 1426002)

Are you going to use this again this year and if so, what size wheels? We might do something like this

lark95

11-01-2015 13:58

Re: To Strafe or not to Strafe

Quote:

Originally Posted by JorgeReyes (Post 1426068)

Are you going to use this again this year and if so, what size wheels? We might do something like this

We are doing a 6 inch mucnum drive this year. But monday night i can post some pics of last years chassis if i get a chance.

We used 4 inch wheels.

JorgeReyes

11-01-2015 14:07

Re: To Strafe or not to Strafe

I don't think that 4 in wheels will clear the scoring platform. I'm guessing your planning on driving around them then?

lark95

11-01-2015 14:23

Re: To Strafe or not to Strafe

Quote:

Originally Posted by JorgeReyes (Post 1426268)

I don't think that 4 in wheels will clear the scoring platform. I'm guessing your planning on driving around them then?

That was last years chassis. This year we are using 6 inch mecnum.

Lewis Nerone

11-01-2015 18:40

Re: To Strafe or not to Strafe

Quote:

Originally Posted by JorgeReyes (Post 1426268)

I don't think that 4 in wheels will clear the scoring platform. I'm guessing your planning on driving around them then?

Correct, no 4" wheel will be able to clear the scoring platform. A 6" wheel is going to be your best option.

Thad House

11-01-2015 18:53

Re: To Strafe or not to Strafe

Quote:

Originally Posted by Lewis Nerone (Post 1426401)

Correct, no 4" wheel will be able to clear the scoring platform. A 6" wheel is going to be your best option.

This is not right. 4" wheels will absolutely be able to clear the platform. But it will require a little bit of creativity to do so.

smclean1969

11-01-2015 20:09

Re: To Strafe or not to Strafe

We used mecanum wheels in Ultimate Ascent. They were great on the mobility aspect but had some significant drawbacks. Here are the drawbacks: they slip when they initially start up. This makes autonomous very challenging because it's imprecise during the initial movement. It has very poor pushing power so it's not good for defense or beating a defensive robot.

So, for this year, there's no defense so that part of the game wouldn't be applicable.

We used omni wheels on Logomotion, our first year. They made the robot highly mobile which was great for our ability to rank 7 / 65 teams that year--that's our beast seed ever so I can attest they can work very well. The downside is limited friction so again, they're not very effective for defense or beating a defensive robot. So, that's not applicable in this year's game.

Ether

11-01-2015 21:37

Re: To Strafe or not to Strafe

Quote:

Originally Posted by smclean1969 (Post 1426447)

Here are the drawbacks: they slip when they initially start up. This makes autonomous very challenging because it's imprecise during the initial movement.

Is your team familiar with command rate-limiting?

RonnieS

12-01-2015 08:48

Re: To Strafe or not to Strafe

Quote:

Originally Posted by Lewis Nerone (Post 1426401)

Correct, no 4" wheel will be able to clear the scoring platform. A 6" wheel is going to be your best option.

I guess we didn't read this...we are going over just fine with them ;)

lark95

12-01-2015 10:59

Re: To Strafe or not to Strafe

Quote:

Originally Posted by Ronnie314 (Post 1426639)

I guess we didn't read this...we are going over just fine with them ;)

Were is the hub of the wheel in relation to the bottom of your chassis?

Whippet

12-01-2015 11:34

Re: To Strafe or not to Strafe

Quote:

Originally Posted by Lewis Nerone (Post 1426401)

Correct, no 4" wheel will be able to clear the scoring platform.

Did you mean no 4" mecanum?

RonnieS

12-01-2015 13:37

Re: To Strafe or not to Strafe

Quote:

Originally Posted by lark95 (Post 1426702)

Were is the hub of the wheel in relation to the bottom of your chassis?

I guess would could say that one set of our wheels is centered on our chassis, there is no drop. That is as much as I will say until Reveal night :rolleyes:

lark95

12-01-2015 23:15

Re: To Strafe or not to Strafe

5 Attachment(s)

Quote:

Originally Posted by JorgeReyes (Post 1426068)

Are you going to use this again this year and if so, what size wheels? We might do something like this

Here are the promised pics of our old drive train. It uses for inch wheels 4sim drive and chain for the drive transfer. Overall it is a great driving chassis, one of the best i have ever driven.

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