Chief Delphi

Chief Delphi (http://www.chiefdelphi.com/forums/index.php)
-   Extra Discussion (http://www.chiefdelphi.com/forums/forumdisplay.php?f=68)
-   -   pic: Robo Riot 3418 practice robot (http://www.chiefdelphi.com/forums/showthread.php?t=140398)

lark95 18-12-2015 23:41

pic: Robo Riot 3418 practice robot
 

billbo911 18-12-2015 23:44

pic: Robo Riot 3418 practice robot
 
It looks like you just need a belly pan and it is good to go!

Specs please.
Transmission used and ratio.
Drive formula (if not standard Kiwi).
Gyro?
Weight?

This looks like a well conceived design, I'm sure it you have learned a lot just by building it.

bkahl 18-12-2015 23:45

Re: pic: Robo Riot 3418 practice robot
 
Quote:

Originally Posted by billbo911 (Post 1513552)
It looks like you just need a belly pan and it is good to go!

Looks to me like there's a Lexan bellypan.

billbo911 19-12-2015 00:39

Re: pic: Robo Riot 3418 practice robot
 
Quote:

Originally Posted by bkahl (Post 1513553)
Looks to me like there's a Lexan bellypan.

Now that I look at an expanded image, I believe you are correct. Either that or they have discovered the secrets of levitation!

GeeTwo 19-12-2015 03:17

Re: pic: Robo Riot 3418 practice robot
 
Quote:

Originally Posted by billbo911 (Post 1513552)
It looks like you just need a belly pan and it is good to go!

Other than as a control board, is a belly pan really needed on an essentially triangular robot?

lark95 19-12-2015 19:21

Re: pic: Robo Riot 3418 practice robot
 
We used the Andymark bane bot gearboxes for CIMs, 16:1 gear ratio. The frame with gearboxes and motors weighs 24 pound even. The mane frame is 1/8th wall 1 by 2 aluminum. We used 3/16 aluminum/steel rivets. Each side is 24.5 inches long.

lark95 19-12-2015 19:23

Re: pic: Robo Riot 3418 practice robot
 
Quote:

Originally Posted by GeeTwo (Post 1513569)
Other than as a control board, is a belly pan really needed on an essentially triangular robot?

No, the belly pan is not needed for strength at all. We just use it to mount all of the electronics to. Everything is directly threaded to the lexan making it very easy to remove components.

We used 1/4 inch lexan with 4 10/32 screws on each side threaded directly to the frame rails. I am thinking that the side with the battery might be be quite strong enough but we will see after some demos.

Ari423 19-12-2015 20:34

Re: pic: Robo Riot 3418 practice robot
 
Does putting the battery on one side make the robot drive crooked? We had problems last year on mecanum with uneven wheel loading. I imagine it would be similar if not worse on a kiwi drive.

lark95 19-12-2015 21:16

Re: pic: Robo Riot 3418 practice robot
 
Quote:

Originally Posted by Ari423 (Post 1513650)
Does putting the battery on one side make the robot drive crooked? We had problems last year on mecanum with uneven wheel loading. I imagine it would be similar if not worse on a kiwi drive.

I havent really noticed anything weird. I have notice that it does not strafe very well no matter what.

Ari423 19-12-2015 21:44

Re: pic: Robo Riot 3418 practice robot
 
Quote:

Originally Posted by lark95 (Post 1513660)
I havent really noticed anything weird. I have notice that it does not strafe very well no matter what.

I wonder if you saet the battery over the center of the robot and tried driving if it would strafe better. When we added ballast to the opposite side of our robot last year to shift the CoM to the center it corrected all of our strafing problems.

lark95 19-12-2015 22:38

Re: pic: Robo Riot 3418 practice robot
 
Quote:

Originally Posted by Ari423 (Post 1513662)
I wonder if you saet the battery over the center of the robot and tried driving if it would strafe better. When we added ballast to the opposite side of our robot last year to shift the CoM to the center it corrected all of our strafing problems.

That certainly is possible. However at this point it would be to much trouble.
Also the only service we have driven it on is a concrete floor. I am not really sure how it will handle on carpet.

GeeTwo 20-12-2015 08:46

Re: pic: Robo Riot 3418 practice robot
 
Quote:

Originally Posted by lark95 (Post 1513660)
I havent really noticed anything weird. I have notice that it does not strafe very well no matter what.

Assuming that you consider the battery to be at the back (or front) of the robot, that makes sense. Most of the weight is on the two "side" wheels, which point mostly forward/back, so you can get good forces in the forward/reverse direction. When trying to go sideways, half of the force should normally be coming from the "nose" wheel, but as it is carrying little weight, it cannot generate as much force.

As these wheels will have a higher CoF on carpet, I would expect better performance, including when strafing.

Ari423 20-12-2015 09:06

Re: pic: Robo Riot 3418 practice robot
 
Also since it looks like when that picture was taken the radio hadn't been fully mounted, you should try to move it away from that motor. Motors can cause electrostatic interference that messes with the WiFi signal. The further away your radio is from motors, large power wires, or spinning brushes (read static-y stuff) the better signal you'll get.

lark95 20-12-2015 19:13

Re: pic: Robo Riot 3418 practice robot
 
Quote:

Originally Posted by Ari423 (Post 1513680)
Also since it looks like when that picture was taken the radio hadn't been fully mounted, you should try to move it away from that motor. Motors can cause electrostatic interference that messes with the WiFi signal. The further away your radio is from motors, large power wires, or spinning brushes (read static-y stuff) the better signal you'll get.

We will definitely do that at some point. In future preseasons we are going to be adding something on top,maybe something like a ball shooter of some sort. Then we will be able to mount the radio farther up at out of all the noise from the electronics.


All times are GMT -5. The time now is 15:30.

Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi