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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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You're right. Also the fact that their drums had lightening holes beside the teeth could also be one of the reasons. However, I didn't remember any of the drums crack right beside the holes but I could be wrong.

Post Sun Oct 29, 2017 8:40 pm 
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MoonSet416



Joined: 25 Sep 2016
Posts: 436
Location: Sydney


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got bored revising for exams;
drew a drum according to my sketch on paper; (about 15 cm radius and 32 wide)
the drum turned out to be like 13kg;
gave up;

Post Wed Nov 01, 2017 10:44 pm 
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MoonSet416



Joined: 25 Sep 2016
Posts: 436
Location: Sydney


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After a few hours of experimenting this design has been the only one that can be about the same weight as the weapon on Abomination and have only 5% less MOI, but I do worry a lot about the structrual strength of this weapon.

Post Wed Nov 01, 2017 11:34 pm 
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Nick
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Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW


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I don't believe anyone has gotten a design like that to work at high RPM - the screwed together connections just don't have the strength. The vertical parts are aluminium to keep the weight down? Its also going to have even more aerodynamic problems than my beater.
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Post Wed Nov 01, 2017 11:40 pm 
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MoonSet416



Joined: 25 Sep 2016
Posts: 436
Location: Sydney


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i agree... guess ill just scrap this one.
will probably try a classic egg beater next...

Post Wed Nov 01, 2017 11:48 pm 
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MoonSet416



Joined: 25 Sep 2016
Posts: 436
Location: Sydney


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I think I need some ballpark numbers on this one... how thick is Mr. Mangle's egg beater and how thick is each horizontal bar? For some reason the weight is getting out of hand quickly...

Also the design is getting closer and closer to an overweight Shiny...

Post Thu Nov 02, 2017 12:28 am 
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maddox



Joined: 21 Dec 2006
Posts: 786
Location: Belgium


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If I recall correctly, 30mm Hardox 500 for the monoblock beater waterjetted in Belgium.

Post Thu Nov 02, 2017 1:20 am 
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Nick
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Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW


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The cross section is 30 x 19mm and the weight is a fraction over 3Kg
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Post Thu Nov 02, 2017 6:44 am 
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MoonSet416



Joined: 25 Sep 2016
Posts: 436
Location: Sydney


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Thx for the info. Just drew one with a similar cross section.

Which turns out to be around 5.5kg. Maybe my initial design was too wide...

Post Thu Nov 02, 2017 8:31 am 
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MoonSet416



Joined: 25 Sep 2016
Posts: 436
Location: Sydney


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Changed the layout of my sketch and made the bot more compact, the width of the eggbeater is now around 22cm.

This allows me to have a larger diameter (18cm) and a somewhat acceptable MOI finally. (just a bit lower than the hollow drum for Contraption) Also beefed the bars up over the ballpark numbers just a bit for safety since this one has way more mass (5.1kg) to stop when it hits something.

Post Thu Nov 02, 2017 12:54 pm 
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maddox



Joined: 21 Dec 2006
Posts: 786
Location: Belgium


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You want bigger radiï on the corners everywere.

Post Thu Nov 02, 2017 3:30 pm 
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MoonSet416



Joined: 25 Sep 2016
Posts: 436
Location: Sydney


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Hmmm... What radius does the egg beater on Mr Mangle have? First time designing such a bot and I don't know a thing lol

Post Thu Nov 02, 2017 7:43 pm 
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Nick
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Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW


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I used a 5mm radius and the beater hasn't broken yet
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Post Thu Nov 02, 2017 8:21 pm 
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pilleya



Joined: 31 Mar 2016
Posts: 91
Location: Sydney


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Try and make the axle/shaft as large as possible. It looks like it is smaller than the beater thickness at the moment, 30mm bearings are common so that won't be a problem.

Post Thu Nov 02, 2017 8:38 pm 
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Nick
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Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW


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I am only using 20mm bearings to reduce weight & size and the shafts are still like new.
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UK 2016 Gladiator champion

Post Thu Nov 02, 2017 8:39 pm 
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