I found a shaft that may work well for the Mascot. I've included it in the following images. I'll bring the partial assembly to this month's meeting.
Mascot Parts list to date:
Motors with gearheads___________________________Mike Lynch
Shaft, bearings, wheel locks ______________________Keith Rowell
Motor controller boards __________________________Ringo
Mascot Parts wish list:
wheels
frame material
power
controller
sensors
5 comments:
Hi Mike,
The AHRC does own several pieces of hardware that you all may want to use on the mascot project. Solutions Cubed did donate parts to the club a good while ago and they are still here at NetPlanner. Anyone you folks designate is welcome to pick them up whenever you need. I just pulled out the box of parts from the storage room here at NetPlanner and here is a list of what the club owns:
2 of ER_12V200_WHL1 Wheel/Motor "Easy Roller" Kits
1 Motor Mind B
1 Motor Mind C Carrier Board
1 ICON H-Bridge
1 ICON H-Bridge Interface Module
1 Motor Mind C
1 Micro PID Position Controller
These items are in the original packages having never been opened. Keep in mind that the club also owns a Friendly Robotics lawn mower if that can be integrated into the project in any way.
I look forward to participating in more robotic projects with you all at some point in the future.
All the best,
Clint Bridges
I was wondering, are any of the parts set in stone? IE if down the road its decided that the functionality needs to be slightly different (IE you want to be able to do dead recokning so you need to add encoders, etc) can the parts you have now be changed or replaced?
Another question RE drive train/power control, did not solutions cubed donate some product to the club? Would this project not be a good use for such donated items? Or were they prizes for use elsewhere?
Has anyone tried to get anything from any of the club sponsors for this project?
Mike
PS: I 'might' be able to donte a controller to the project if I think it would be fully utilized. Otherwise I could probably just donate my time to wire
one up. AVR's are really easy to prototype with :)
Thanks Clint and Mike.
On your question about the design being in stone Mike, that's a definite no. All we have done so far is put some ideas on "paper" (electronic CAD paper). The physical parts are necessary only to get from concept to physical layout. But the design should evolve to the whims of the members. Don't let the images you see here restrict your imagination. Be free! Be free!
I'll just reflect the comments I get here in the drawings as best I can. I will give preference to those parts "in hand" for the sake of pragmatism, but any idea is game here in virtual land.
And as for the parts "in hand" Clint, thanks for the note. I'll contact you to pick those up, dimension them, and get them into the CAD files. With that many motor controllers, I can see dramatic articulations in our future.
One more thing on the changes question. I would expect that a club owned bot would continue to evolve as long as the club still existed and members had intrest, returning over and over like a bad penny.
The hole through the gearbox is 0.438". To avoid reaming out the gearbox hole, we could make a bushing/spacer to make the larger wheel bearing fit a smaller shaft. A larger shaft would be a good thing for carrying more weight, less "flexy". I'd go with the larger 13" wheel if I were buying(larger diameter = smother rolling, and it's cheaper) but where are we going to get a large caster? Is anyone ambitious enough to attempt balancing? We should probably see what shows up in the contribution box for wheels. By the way, how wide are those pneumatic wheels?
I like this wheel,
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=29520&item=4336029986&rd=1
I know the diameter is big, as you mentioned Dale, torque and speed should be calculated first. Rough estimates were established by powering the motors from a battery and trying to stop the hub with my hands, which I couldn't. The gearing is very low. Big wheels might be good.
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