[Ri3D] BOOM DONE. We're not done...

[mbshark]

Will there be a vid on the youtube channel or twitter or something on robotin3days.com when you guys put up a cad? Right now each team's blog is just bios of you guys like its been for forever and the only place where you see new stuff is youtube and twitter. Also the only CAD for Ri3D that I found was team Andymark and it was on a CD post - Are there any more currently available?

[MrRiedemanJACC]

How did you handle the Max RPM difference between the CIM and Minicim? Did you do anything or are they close enough to be interchangeable?

[coalhot]

Originally Posted by MrRiedemanJACC

How did you handle the Max RPM difference between the CIM and Minicim? Did you do anything or are they close enough to be interchangeable?

There's a post (by either JVN or Paul Copioli) talking about the minicims being a drop in replacement for the CIM, even with the free RPM difference. Don't feel like dragging through a whole bunch of threads to find it, but it's there.

It's actually a very useful piece of info that not many people knew when the minicims were released last year. However, it is mentioned on the VEX site

[geomapguy]

Originally Posted by coalhot

It's actually a very useful piece of info that not many people knew when the minicims were released last year. However, it is mentioned on the VEX site

From VexPro Website

The Mini CIM has 2/3 the power of a CIM motor, in a similar form-factor and with the same mounting. Similar output speeds allow Mini CIM motors to be combined in mechanisms with full-size CIM motors using the same gearing. Use this motor interchangeably with CIMs in your designs, then swap them in and out to put your power where you need it most.

[Ether]

Originally Posted by MrRiedemanJACC

How did you handle the Max RPM difference between the CIM and Minicim? Did you do anything or are they close enough to be interchangeable?

This thread may give some insight into the physics and math of combining motors:

http://www.chiefdelphi.com/forums/sh...d.php?t=123424

[Ben_R]

I am amazed at what everyone at Boom Done achieved over the three day period. The result is an epic robot!

Dr Joe, I have one question about the bull horns. What is the red material that is wrapped around the PVC of the horns? My first guess is some sort of high friction strip material.....

[Joe Johnson]

Originally Posted by Ben_R

I am amazed at what everyone at Boom Done achieved over the three day period. The result is an epic robot!

Dr Joe, I have one question about the bull horns. What is the red material that is wrapped around the PVC of the horns? My first guess is some sort of high friction strip material.....

Rubber wrap answered here. Here is info about the gearmotors. Here is info about the sticks.

ALSO, go vote for Team BOOM DONE. we are currently behind in the voting, which, while I like the other Ri3D robots, I feel pretty strongly that BOOM DONE. should be winning this vote.

Dr. Joe
_

[idahorobot]

Regarding the "Toro Sticks", how do you think they will hold up to being hit? Is there some flex or would they snap?

[billbo911]

I'm completely in awe of this "3 day robot", Amazing!!

We are planning on doing a similar process with a range finder + display, though it will be with our own twist of course.
We too plan on using a couple of onboard co-processors to do this work. Arduino for display and PCDuino for vision. This will eliminate the need for any additional WiFi bandwidth.

I would love to see the Arduino code you are using and any specs you might have on the US sensor you used.

What, if any, protocol are you using to communicate between the Arduino and the cRio?

[Joe Johnson]

Originally Posted by billbo911

I'm completely in awe of this "3 day robot", Amazing!!

We are planning on doing a similar process with a range finder + display, though it will be with our own twist of course.
We too plan on using a couple of onboard co-processors to do this work. Arduino for display and PCDuino for vision. This will eliminate the need for any additional WiFi bandwidth.

I would love to see the Arduino code you are using and any specs you might have on the US sensor you used.

What, if any, protocol are you using to communicate between the Arduino and the cRio?

Working on publishing this. Stay tuned.

Joe J.

[msaunders]

Very Nice.
What is the reduction used for the macanum's?

[geomapguy]

What's the tooth count on the top drive sprocket??

[Joe Johnson]

Originally Posted by geomapguy

What's the tooth count on the top drive sprocket??

Ratio is not fully optimized imho, but this is what we have now on each wheel:
CIM + Mini-CIM
CIMpleBox: 12:56
#35 Chain: 12:24
6" Vexpro Mecanum

Some notes:
The JVN spreadsheet (Very useful) puts the top at 12 to 15 ft per second (going forward, not crabbing).

In practice, I think we are a bit slower than I'd like to be if we are going to be a fast nimble robot rather than a pushing robot. So, I would am probably going to push for a lower ratio (more speed) by going to a 16T sprocket rather than the 12T.

Also, the mecanum wheels were not my favorite choice. And I think I was right. They are scaring me. A number of the small wheels on the 6" mecanum wheels are pretty wobbly already and they don't seem to roll well. Have others had issues with the Vexpro mecanums? do tell...


Dr. Joe.

[Calvin Hartley]

Originally Posted by Joe Johnson

lso, the mecanum wheels were not my favorite choice. And I think I was right. They are scaring me. A number of the small wheels on the 6" mecanum wheels are pretty wobbly already and they don't seem to roll well. Have others had issues with the Vexpro mecanums? do tell...

We used them for part of our season last year. We really liked them, and they held up to use well. However, part way through the summer during demos and whatnot, the rollers started to break off. They worked great for us through the season, but many rollers broke within a short time once they did start breaking.

Hope this helps, I know it's not very specific nor detailed information...

[Joe Johnson]

Originally Posted by Calvin Hartley

We used them for part of our season last year. We really liked them, and they held up to use well. However, part way through the summer during demos and whatnot, the rollers started to break off. They worked great for us through the season, but many rollers broke within a short time once they did start breaking.

Hope this helps, I know it's not very specific nor detailed information...

Is this other folk's experience as well? I it doesn't seem to me that we are abusing them so I am kind of freaked out.

Dr. Joe.