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Micro Magnum, Team Magnum, NSW
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MoonSet416



Joined: 25 Sep 2016
Posts: 436
Location: Sydney


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Thanks Glen. That's a lot of help to me.

That motor sure sounds very amazing (and super efficient), any specs/dimensions of this motor? (At the event this motor did look just a bit bigger than the NTM, but it might have been this one being shiny.) The HK page doesn't even seem to have specs for this motor.

Hmm... I'm pretty sure that the NTM motor is overvolted to 6s as opposed to this one being rated at 6s, this might be causing the issue for those bots.

So I guess... My SimonK journey starts hereXD.

Post Thu Aug 24, 2017 9:11 pm 
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MoonSet416



Joined: 25 Sep 2016
Posts: 436
Location: Sydney


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Update:

Designed a cage for the brushless drive motors.


(WIP)New disc, better MOI to weight ratio, wider, deeper bite.

Post Fri Aug 25, 2017 12:25 am 
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Valen
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Joined: 07 Jul 2004
Posts: 4436
Location: Sydney


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3 spokes are probably going to be better, if you get hit by a vertical spinner it could twist that along the axis of the spokes I think.
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Post Fri Aug 25, 2017 10:06 am 
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MoonSet416



Joined: 25 Sep 2016
Posts: 436
Location: Sydney


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Yeah you're right.

Just CADed up a three spoke version. Surprisingly it's more MOI efficient than the two spoke.

Post Fri Aug 25, 2017 12:12 pm 
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Nick
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Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW


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I agree with Jake; the 3 spoke version will be much tougher and the extra KE never hurts.
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Post Fri Aug 25, 2017 5:05 pm 
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MoonSet416



Joined: 25 Sep 2016
Posts: 436
Location: Sydney


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Yeah more KE is almost always better.

Post Sat Aug 26, 2017 7:15 pm 
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MoonSet416



Joined: 25 Sep 2016
Posts: 436
Location: Sydney


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Update:

Been addicted to PUBG this week so not much done.

Basically confirmed that a 2820 stator size is probably equal to 3542 motor size, so I adapted the motor cage to the size of the Rotorstar motor.

Ran into some problems with the length of the motor... The drive motors are a bit longer than I expected, so the space in between the motors (that's where I plan to have the escs sit) might be a bit tight. I reduced the cap plate thickness to give just a bit more space, but that barely worked. I expect to see very bent battery leads and motor wires.

Had an idea to develop a tri-wedge attachment/module for Contraption to get under other wedges. The fixed wedge will only have its middle part touching the ground, and the sides will be occupied with two hinged wedges.

Also, I realized that my next event has a 15kg max weight, which leaves me with about 1.4kg free weight after the mod1 upgrade. Besides sticking HDPE onto Contraption like ERA onto T72s, what other things do you guys think I could do with the robot?

Post Wed Aug 30, 2017 4:10 pm 
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Ondray



Joined: 06 Jul 2015
Posts: 142
Location: Newcastle


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These probably weigh 1.4kg:

http://www.ebay.com.au/itm/12V-Loud-Twin-Dual-Tone-Snail-Air-Horns-Set-Siren-For-Car-Boat-Motorcycle-Van-/301985858044?epid=1155376706&hash=item464fc281fc:g:Tq8AAOSwiGJZeX18

Post Wed Aug 30, 2017 6:52 pm 
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MoonSet416



Joined: 25 Sep 2016
Posts: 436
Location: Sydney


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10/10 will buy lol

Post Wed Aug 30, 2017 7:02 pm 
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MoonSet416



Joined: 25 Sep 2016
Posts: 436
Location: Sydney


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OK an idea came up, and I caded up some early drawings of this hollow drum/dual disk hybrid... On paper it's 10% heavier, but has almost 50% more MOI, which is kinda crazy. However, I'm worried about its structural strength now... What do you guys think?

Post Fri Sep 01, 2017 12:06 am 
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maddox



Joined: 21 Dec 2006
Posts: 786
Location: Belgium


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Poor bolts, that is what I think of it.

You'll need some way to lessen de shockloads on those.

Post Fri Sep 01, 2017 2:24 am 
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Nick
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Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW


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I agree with Mario, those bolt heads are going to get damaged or sheared off very quickly
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Post Fri Sep 01, 2017 8:20 am 
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Knightrous
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Joined: 15 Jun 2004
Posts: 8511
Location: NSW


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Instead of bolts, I would use press fit pins and then stitch weld the segments together
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Post Fri Sep 01, 2017 9:12 am 
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MoonSet416



Joined: 25 Sep 2016
Posts: 436
Location: Sydney


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Yeah that is what I was worrying about. The M6 bolts on the outer ring would not be enough, but I don't have the spare weight to have the ring thick enough to accept M8s.

I will try to look into having a smaller diameter but thicker ring... That will decrease MOI, but at the same time I get more bite.

About welding... Unfortunately I don't have the equipment for that, and I would also like to have the ability to replace parts should they get damaged.

Post Fri Sep 01, 2017 10:53 am 
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Nick
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Joined: 16 Jun 2004
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Location: Sydney, NSW


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That sort of construction is a lot like Equinox's drum, which did very well at Robochallenge. If you made the central drum from mild steel and left off the teeth, you could use countersunk screws through the disks into tapped holes in the drum.

Equinox uses aluminium for the central drum section and it took relatively little damage. with a short drum section is steel, there should be even less damage.
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Post Fri Sep 01, 2017 12:18 pm 
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