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pic: 148 Follower Wheel Assembly
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Re: pic: 148 Follower Wheel Assembly
Totally unnecessarily awesome... :cool:
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Re: pic: 148 Follower Wheel Assembly
How is this going to measure ground speed if it can't touch the ground?
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Re: pic: 148 Follower Wheel Assembly
It can.
The GDC has ruled that similar devices do not count as "traction devices" in the Q and A. |
Re: pic: 148 Follower Wheel Assembly
It was asked in the Q&A and they said that if it does not provide traction than it can touch the ground. The actual rule says that the rover wheels are the only thing that can provide traction, not the only thing that can touch the ground.
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Re: pic: 148 Follower Wheel Assembly
Here is a relevant Q&A on the subject
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Re: pic: 148 Follower Wheel Assembly
We were planning to do the same thing, but with all vex components, including the new encoders. Hadn't gotten to it yet.
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Re: pic: 148 Follower Wheel Assembly
Fabulous use of VEX parts in a very elegant package. I think we'll be seeing a lot of similar assemblies this year.
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Re: pic: 148 Follower Wheel Assembly
Humm - how much bigger than the green gear is that omni wheel? The reason I ask is because on the carpet, the wheel may sink in enough to allow the gear to grab some carpet fibers.
Also, is it just pivoting off the robot frame from that empty set of holes, and thus using gravity to keep it in contact with the floor? |
Re: pic: 148 Follower Wheel Assembly
If you are just using gravity to maintain contact with the ground have you tested to see if it slips at all when driving on the regolith?
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Re: pic: 148 Follower Wheel Assembly
Beautiful assembly!
Have you tested whether it will stay on the ground under its own weight? If not, may I suggest gas springs! |
Re: pic: 148 Follower Wheel Assembly
Correct me if I'm wrong, but are those delrin sideplates? They look very nice. Good luck with this. =)
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Re: pic: 148 Follower Wheel Assembly
I like the fact that black gear is an ABS rapid prototype. Want to clue the world into the right pitch for interfacing with a vex gear?
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Re: pic: 148 Follower Wheel Assembly
Soo.... will Vexlabs be selling these?
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But it would be one anal inspector to call you for that :) |
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Edit: Yup, they're 24 DP. |
Re: pic: 148 Follower Wheel Assembly
wow JVN this looks VERYYYY familiar....ours looks almost identical...
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Re: pic: 148 Follower Wheel Assembly
Very nice! But why such a big green gear? I'd have used a smaller gear and a similar green gear on the encoder. I am curious.
Also, I think we'll be stealing the idea! (kinda sorta) Thank you! Don |
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The side plates are laser cut ABS, 1/8" thick (cut on our small 12x24" laser, not the big one that does the sheet-metal.) The coupler is 3D printed ABS on our Dimension SST. I feel pretty darn spoiled. Probably could have gone with a smaller package, but we've got plenty of room in the drivetrain to mount it. Like Raul said, if the 60t gear catches some carpet we may change it. I'm not real concerned. *Shrug* This was done quickly and the design group moved onto other things. -John |
Re: pic: 148 Follower Wheel Assembly
Why not use the larger omni wheel? It would get the wheel away from the gear more. Also the larger omni probably has a less likely chance of slipping...
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Re: pic: 148 Follower Wheel Assembly
Looks strikingly similar to something we're making...
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Re: pic: 148 Follower Wheel Assembly
With a few modifications you could use the US Digital encoders that come in the kit.
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Re: pic: 148 Follower Wheel Assembly
Wow, maybe this was NOT worthy of showing off. Sounds like almost every team in FIRST has something "identical" or better back in their shop. Color me corrected.
-John PS - Of course I was joking about starting my own company and selling these. |
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It's a family business. Right now we have no products, we just intend to steal good ideas from Chief Delphi posts and set up shop. Right now we are producing a cool wheel follower assembly that it appears you have copied... :) (our lawers will be contacting you for the patent infringement) |
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Re: pic: 148 Follower Wheel Assembly
John,
Are you running any sort of bushing on the vex shaft? Or, are you just letting it ride on the 1/8" hole in the ABS? (I'm having a hard time finding a flanged bushing for an 1/8" shaft) Very pretty, thanks! Bengineer FRC1350 |
Re: pic: 148 Follower Wheel Assembly
I bet they are just letting it ride in the hole. In the VEX system the bearings are just delrin with round holes so this plate essentially is the same thing.
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Re: pic: 148 Follower Wheel Assembly
I like it! Let us know what the accuracy of this turns out to be. A measuring wheel is something i always wanted to try. I'm assuming the remaining two holes are a pivot for this thing hang off of.
Just a word of warning about those greyhill encoders, they are very fragile and if subjected to remotely harsh conditions have a tendency to "go crunchy". Have a spare on hand. |
Re: pic: 148 Follower Wheel Assembly
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-John |
Re: pic: 148 Follower Wheel Assembly
Every time I see a teaser/picture from 148 I feel like a tiny kitten who is lost in wonderment and amazement of the string spinning from the fan. I spend about 30 minutes pawing at the screen saying "I can haz?"
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Re: pic: 148 Follower Wheel Assembly
wow,, thats awesome
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