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Question about building a spinning weapon


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Miss Pigeon



Joined: 11 Jan 2017
Posts: 5
Location: Victoria


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Question about building a spinning weapon

I'm planning on building a horizontal spinner for robowars this year, and I'm looking for advice on what to make the weapon out of. I've looked for sources of S7 tool steel, Interalloy seems to be the only place in Australia that sells it. Are there any alternatives to S7 that are more available or cheaper? I've also considered titanium with steel teeth which would probably be better for weight but I haven't found a good supplier. Where do other builders get their materials from and what materials do you use?

Here are a couple of concepts I've drawn up:

http://imgur.com/BmSvv8g
http://imgur.com/KBIwARi

Post Thu Jan 12, 2017 11:36 am 
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Glen
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Joined: 16 Jun 2004
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Helloo, Most here use hardox / bisalloy 500 because it comes prehardened and many places stock it (precision oxycut, australian waterjet cutting, action laser etc).

S7 can be had but hard to find someone that can heat treat it well for you. And it is questionable not that much stronger than the hardox for the effort anyway Smile

Robot looks good!
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Post Thu Jan 12, 2017 11:39 am 
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Miss Pigeon



Joined: 11 Jan 2017
Posts: 5
Location: Victoria


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Any advice on what thickness to use? I've been designing with 25mm in mind because that's the smallest thickness of S7 that Interalloy sells. How thick should I go with the Hardox/Bisaloy?

Post Thu Jan 12, 2017 11:43 am 
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Daniel
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Joined: 30 Aug 2005
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That depends on how heavy you want the weapon to be and what diameter as well. Try to aim for a 3kg weapon with about a 300mm diameter for a disc. And then see what thicknesses match.
A rough guess to begin with would be 20mm.

Post Thu Jan 12, 2017 12:10 pm 
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Miss Pigeon



Joined: 11 Jan 2017
Posts: 5
Location: Victoria


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Would this motor on a 6s lipo be powerful enough for a 3Kg weapon?
https://hobbyking.com/en_us/kd-53-20-brushless-outrunner-195kv.html


Cheers, this has been super helpful Very Happy
I'll make sure to post some updates when we start building.

Post Thu Jan 12, 2017 12:19 pm 
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Glen
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Depends depends, 25mm is quite huge. I bent 12mm blades but the 16 has been okay, nothing is certain in the arena i guess Smile

That motor should be fine too!
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Post Thu Jan 12, 2017 1:13 pm 
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Nick
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Having used S7 in horizontal spinners - just don't do it! There are no local heat treating businesses that understand how to process S7 and it will be so brittle that it will shatter after the first big impact - been there done that Smile. Like Glen mentioned, Bisalloy or Hardox are nearly as hard and much easier to work with in Australia.

That Keda motor is maybe a bit under powered; remember that the 1,500W rating is the maximum power that the motor can produce for a few seconds, not the continuous power, which will be about half that.
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Post Thu Jan 12, 2017 5:58 pm 
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