hey guys,
I nagged on this forum a lot and figured i may as well post a pic of the final product…
The competition was today and this robot blew away the competition, that is until the chassis failed critically… stupid acrylic…
anyway id love to know what you guys think of it.
http://i218.photobucket.com/albums/cc186/ruedorb/design1033.jpg
I bet it blew away the competition! 
The other robots must have found it hard to compete against an invisible robot, I can’t seem to see it! 
wierd, i can see it fine.
Me too. Cool little guy.
I know there are a lot of people who really like acrylic (mainly because it is cheap I suppose), but I personally would never build a robot using it. Delrin is a far superior plastic to use - it machines nicer, it has a much higher melting point (which helps with the machining), and it is enormously less brittle than acrylic.
I found a local supplier in Brampton (near Toronto) who sells sheets of Delrin, cut to whatever size you want. I typically buy a couple large pieces (2’ x 2’) in both 1/4" and 1/8" thickness.
But I like your robot - its a nice use of a nice tread kit… Do you have any video?
it was cheap, not my first choice. but it was all i could find. I could have shopped around more though.
The acrylic was pretty nice to work with and held up fine, but i plan to use 1/8th inch steel for two reasons:
-the robot was not heavy enough and i can make it beefier.
-the torque from the screwdriver motors is what snapped the base so it has
to be very strong!
There is a short clip of it battling the robot that won the competition on youtube, so you can get an idea how it should have done…
here it is:
I would advise you to look at using aluminum instead of steel. Go with 1/4" aluminum if you need lots of heft, and 1/8" or even 1/16" for your tread support pieces.
Aluminum is much easier to work with than steel…
yea, i love aluminum, cuts like butter. but i cant use 1/4" no room.
Steel is a pain but i have access to a full machine shop so getting it done is no problem there.
cheers,
Don’t forget polycarbonate. It cuts easier than acrylic but is not brittle. Nice bot by the way. I wanted to build a tracked vehicle for sumo. You beat me to it. 
Keep up the good work! 8)
Nice pic.
Personally I would use aluminum also. It won’t rust, easy to work with, strong and light weight.
If I had to use steel, I would use stainless steel. I just hate rust.
great job on the winning design!
What the HELL! McGill!
You come from Montreal!
I live Sherbrooke! There are some pretty nice sumo robot here in MTL!
The guys from ETS, Denis Seguin and me:P
Do you know about robomontreal.com
We have a forum and we talk about all sort of robots.
ciao
Jerome
Now I see it! Very cool. 8)
hey you found me^. i added some pics of the build to the link above including a test run on a water bed. if your sumo cant run on a water bed what good is it anyway???
How’d you get the drill motors to attach to the tracks? Did you put a 6mm shaft into the drill head and attach a univeral hub to connect it to the sprockets? 
yep, i made a jig to drill press out the 6 mm hubs to 10mm then slipped it onto the screwdriver crankshaft. then the hub bolts to the sprockets.
ahh, so you modified the hub to fit the shaft. cool! 8)
exacly
Awesome tracked sumo! Great job, really. I think a lot of people had the same idea, but ideas don’t mean crap… working robots do. Kudos!
I also have been using Delrin. I cut the panels for my rover from Delrin sheets and it turned out great.
those drill motor are now at 13,99$ at canadian tire!
I bought two put will bring them back. I will have a hard time making wheels for them.
I but them side by side and it need to fit in 20cm
ciao
Jerome
