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Micro Magnum, Team Magnum, NSW
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Glen
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Joined: 16 Jun 2004
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What tools have you got access too? spinners are a bit tricky to do without a lathe or welder at least.
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Post Sun Mar 26, 2017 6:44 pm 
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MoonSet416



Joined: 25 Sep 2016
Posts: 436
Location: Sydney


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To be honest, next to nothing.

However, I might be seeking help from my university in hope that they can lend me some tools, or maybe I can just let Taobao be my friend and order the parts (as weird as it sounds it actually sorta works, I have a friend in the States who built a lightweight with parts from Taobao).

Post Sun Mar 26, 2017 6:53 pm 
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Nick
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Joined: 16 Jun 2004
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Location: Sydney, NSW


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Most or all of the body panels can be laser cut - only the pocketing presents real difficulties. You may not get far with tools from a university; they are way too afraid of personal injury claims so unless you are good friends with the right staff its unlikely to happen. If you can somehow work the bot construction and tool use into your course work, that might boost your chances.

On the design: the side armour panels need more support in the middle. It looks like something can just be squeezed between the wheels and the motors to help prevent the sides from being pushed in.

It will work better if you reduce the main wheel diameter and increase the size of the inverted wheels a bit. Really small inverted wheels don't have much grip on the arena floor.
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Post Sun Mar 26, 2017 7:36 pm 
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MoonSet416



Joined: 25 Sep 2016
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Location: Sydney


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Correct me if I'm wrong, I thought the pockets can be milled. (not really sure if milling machines are that common though)

Yes, the side armor needs reinforcement, thanks for pointing that out.

Abou the wheels... I find it difficult to reduce the diameter on my main wheels because I have quite a few things below my motors (ESCs and a few structural members). Will having a softer inverted wheel help?

Post Sun Mar 26, 2017 8:11 pm 
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Nick
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I just meant the pocketing would be an issue as you don't have a mill - everything can be outsourced for a price though.

If there is a reason for the wheels to be large, that's fair enough. Would it be possible to double-up the inverted wheels for more floor contact? Would it be possible to put the ESC above the motor - it would probably be easier to service in that position.
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Post Sun Mar 26, 2017 8:40 pm 
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MoonSet416



Joined: 25 Sep 2016
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Location: Sydney


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You made a great point. I can just invert the section with the motor in it and things will work out. Thank you Nick.

Post Sun Mar 26, 2017 10:03 pm 
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MoonSet416



Joined: 25 Sep 2016
Posts: 436
Location: Sydney


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Latest version:

http://imgur.com/FuQ8SJ0
http://imgur.com/MytMV5R

Feel free to comment!

Post Mon Mar 27, 2017 6:47 pm 
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MoonSet416



Joined: 25 Sep 2016
Posts: 436
Location: Sydney


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BTW I have a question... In the current design, a lot of the screws (probably M4) to fix the top and bottom plates will go through the 5mm pockets on the aluminum panels. (the first 5mm into the panel the screw will still be in 1.5cm panel, then it enters the 5mm wide pocket area) I wonder if that could cause some cracks.

Post Mon Mar 27, 2017 6:50 pm 
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Nick
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Location: Sydney, NSW


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Its possible but probably not a huge problem. The panels would likely crack from the edge along the threaded hole; by the time to crack propagated to the pocket area, its already game over for the panel. If you are worried, you could drill a cross hole through the base of the threaded hole to stop the propagation.
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Post Mon Mar 27, 2017 7:21 pm 
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MoonSet416



Joined: 25 Sep 2016
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Location: Sydney


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OK I see... Thanks for the information.

Post Mon Mar 27, 2017 9:48 pm 
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MoonSet416



Joined: 25 Sep 2016
Posts: 436
Location: Sydney


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Here are some early drawings of the spinner...

http://imgur.com/56nW5Wd
http://imgur.com/pqRSuGe
http://imgur.com/aeDtaz9

Basically will be the "dual disc spinner" type. (the aluminum tube in between is more like a placeholder... since it's the only way to connect the two discs I can think of right now)

Feel free to comment!

Post Mon Mar 27, 2017 9:59 pm 
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Nick
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Location: Sydney, NSW


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The central tube is usually a smaller diameter than that. While it will increase the kinetic energy, the tube is easy to damage and having all those screw holes out on the rim is asking for trouble (and sheared off screw heads!).

If you made the tube the same diameter as the pulleys, the same set of screws can hold everything together. the smaller tube won't contribute much KE but any saved weight can be put into the rims of the disks. Apart from the tube, everything looks good and the bot design is really coming together.
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Post Mon Mar 27, 2017 11:55 pm 
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kkeerroo
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Joined: 17 Jun 2004
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Location: Brisbane


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If only one of the discs hits an opponent then all the energy from the other disc will be transmitted through the connecting tube. It would need to be strong enough to take the torque of stopping a disc every time you hit an opponent with the other disc. This may happen several times per fight over several fights. A larger diameter tube would be better for this in my opinion.
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Post Tue Mar 28, 2017 6:45 am 
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Nick
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Location: Sydney, NSW


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That's a good point; the dual disks I have seen use very substantial bolts to connect the disks and the tube.
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Post Tue Mar 28, 2017 7:49 am 
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MoonSet416



Joined: 25 Sep 2016
Posts: 436
Location: Sydney


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Thank you guys those were some good points.

I think the tube will be smaller than what it is now, but probably not as small as the pulley to keep it safe and still have enough strength...

Post Tue Mar 28, 2017 7:25 pm 
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