The former part works - but the latter not as it did not help you complete/perform a specific task for your robot - but is rather just your robot. Can’t wait to see the part(s) you submit!
Short answer:
Yes. It works, but it isn’t the BEST option.
Long answer:
This year, I prototyped a vertical extension of our horizontal roller intake after bag and tag. I made some 1/2" hex bore spiral bevel gears that transmitted power at a 1:1 ratio at a 90° angle. While the system did work, we ended up not using it due to size, placement, and vulnerability. To get the strength capabilites you need to use for just about anything, even a low torque intake, the gear tooth has to be pretty large. Also, I had to design the gears myself, just because there aren’t many resources online that I could find for printed gears. Downloading the files for a gear won’t give you the correct tolerances for printing. Had I already not spent some time last semester on how to design spiral bevel gears, I would have had no idea how to do it. Also, I had access to parts printed out of Ultem plastic, which is much stronger than ABS or PLA. In the end, it worked, but not as well as I would have hoped considering the time I put in it.
I would just use the bevel gear from WCP if you can, but I would also love to see somebody refine some designs for printed bevel gears.
If anyone wants to apply their 3D Printed Parts the deadline is this Thursday, April 21st. Remember to also email a picture, render, or the .stp file to [email protected].
We’ve had great submissions so far, and can’t wait to see more!
So I know I cant submit anything because this isn’t for a team, but I just had too share this. this is a printed pattern for making a casting out of cast iron. it is 14" diameter +1% to account for shrinkage, sorry for off topic. https://scontent-ord1-1.xx.fbcdn.net/hphotos-xfp1/v/t1.0-9/10394819_998061536940742_1603997095335851559_n.jpg?oh=179d6586619115c1b937e42dab1cb260&oe=57BC0450
Don’t worry - that’s awesome! Do you use it often?
You can get plastic bevel gears from MCM for fairly cheap: McMaster-Carr
We’ve used em for prototyping before, but never on a final robot.
-Brando
Contest is extended until the 30th - the last day of April. Get applying now!
Hi Everyone,
Here is the submission from Team 1965, the Firebirds from St. Joseph Prep. HS in Brighton MA.
Over the last few years we have been doing a lot of experimenting with 3D printing. We use PTC Creo and a combination of MakerBot Replicators and older Replicator 2s to build our parts. During this period we have developed enough confidence with this process that we developed a full suspension and tank drive system for the game this year. I have included a few pictures below and after the dust settles I will post the CAD files for all of the parts and assemblies.
The track design was an improved version of what I had posted before. The suspension system was design by a few of our students based on some recommendations from mentors to look at how the 1920’s Christie suspension and WW2 sherman tank suspensions worked. It was modified between Northeastern District events to include the extra wheel set on the front bogie to prevent the track from collapsing when going over the rock-wall.
I will get more information posted when I have a moment but feel free to post comments and questions.
Special thanks to the Ligebots in Newton MA that saw our robot at BU and encouraged us to submit this. Pictures are below.
Colm.
