pic: 3847 VEXpro Chassis

[AllenGregoryIV]

[cdm-description=photo]38368[/cdm-description]

[wilsonmw04]

I saw the video of you rolling over righside-up disks. Did you try them upside-down?

[AllenGregoryIV]

I saw the video of you rolling over righside-up disks. Did you try them upside-down?

We did, it works alright. They get sort of stuck sometimes but we just have to back up for a second and it comes right out. Nothing major.

There also wasn't a lot of weight on this robot and we could tell from driving it. We need to get a good/safe way to add weight and than we can do more robust drive tests.

[CalTran]

Looks great. Is the VEX chassis about the same as the kit bot? Any significant difference?

[z_beeblebrox]

Looks great. Is the VEX chassis about the same as the kit bot? Any significant difference?

It's sheet metal instead of extrusion.

Take a look at it here:

http://www.vexrobotics.com/vexpro/chassis-and-framing/2013-drive-in-a-day.html

[MrForbes]

We should be getting our vexpro chassis parts in the mail in a few days. Thinking about the driving over Frisbees problem....it seems it would be relatively easy to put some type of "skirt" at each end of each chassis side, to push Frisbees aside rather than drive over them. Perhaps just a short piece of Lexan or something.

[CalTran]

It's sheet metal instead of extrusion.

Take a look at it here:

http://www.vexrobotics.com/vexpro/chassis-and-framing/2013-drive-in-a-day.html
I know they're fabricated differently. I meant like in terms of use. Ease of construction, strength, attaching extra pieces, etc. etc. etc.

We should be getting our vexpro chassis parts in the mail in a few days. Thinking about the driving over Frisbees problem....it seems it would be relatively easy to put some type of "skirt" at each end of each chassis side, to push Frisbees aside rather than drive over them. Perhaps just a short piece of Lexan or something.
From what we've experimented with the kitbot (6wd long configuration) you can just drive over a frisbee and the drivetrain'll spit it right back out.

[Akash Rastogi]

How much chain wrap do you have on the wheel between the front set and the gearbox? Looks very minimal, but I can't quite tell.

[AllenGregoryIV]

How much chain wrap do you have on the wheel between the front set and the gearbox? Looks very minimal, but I can't quite tell.

It's not as much as we would like and we may try to work on it.

More pictures in this blog post. (http://3847.blogspot.com/2013/01/day-14-two-weeks-down-four-to-go.html)

[sanddrag]

Excuse my ignorance, but what wheels are those?

[z_beeblebrox]

Excuse my ignorance, but what wheels are those?

http://www.vexrobotics.com/vexpro/wheels-and-hubs/217-2903.html

[Chris is me]

(can't delete a post on an image...)

[AllenGregoryIV]

Looks great. Is the VEX chassis about the same as the kit bot? Any significant difference?

The top of the chassis is above the top of the wheels so you can mount things above the wheel wells. There are more holes (1/2" spaced instead of 1" spaced).

[hyperion3360]

What are those wheels? You're the second team we see with these and we can't find them on AndyMark

[AllenGregoryIV]

What are those wheels? You're the second team we see with these and we can't find them on AndyMark

They're VEXpro Versawheels, look up a few posts for the link.

[lynca]

We built a 6-wheel drive VEXpro chassis shown in our mid-season video (http://www.youtube.com/watch?v=9ASksz4GzKU) (non-youtube version (http://2013.discobots.org/node/19) )

6:1 single speed vex gearbox , 24:12 sprockets , 4" versa wheels, 6 motors.

We were impressed with the acceleration but also a bit worried about the sensitivity (driving straight takes some practice). We are thinking about adding exponential control to make small joystick changes less noticeable and low speeds .

I'm curious to know what ratios other teams are using ?

[MrForbes]

We went for 5.33:1, but haven't got it moving yet.

And we are planning to add exponential control.