www.robowars.org

RoboWars Australia Forum Index -> Technical Chat

Question about building a spinning weapon


Post new topic   Reply to topic
  Author    Thread
Miss Pigeon



Joined: 11 Jan 2017
Posts: 5
Location: Victoria


 Reply with quote  
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 
 View user's profile Send private message
Glen
Experienced Roboteer


Joined: 16 Jun 2004
Posts: 9465
Location: Where you least expect


 Reply with quote  

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!
_________________
www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz

Post Thu Jan 12, 2017 11:39 am 
 View user's profile Send private message Send e-mail Visit poster's website MSN Messenger
Miss Pigeon



Joined: 11 Jan 2017
Posts: 5
Location: Victoria


 Reply with quote  

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 
 View user's profile Send private message
Daniel
Experienced Roboteer


Joined: 30 Aug 2005
Posts: 2729
Location: Gold Coast


 Reply with quote  

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 
 View user's profile Send private message Send e-mail
Miss Pigeon



Joined: 11 Jan 2017
Posts: 5
Location: Victoria


 Reply with quote  

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 
 View user's profile Send private message
Glen
Experienced Roboteer


Joined: 16 Jun 2004
Posts: 9465
Location: Where you least expect


 Reply with quote  

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!
_________________
www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz

Post Thu Jan 12, 2017 1:13 pm 
 View user's profile Send private message Send e-mail Visit poster's website MSN Messenger
Nick
Experienced Roboteer


Joined: 16 Jun 2004
Posts: 11729
Location: Sydney, NSW


 Reply with quote  

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.
_________________
Australian 2015 Featherweight champion
UK 2016 Gladiator champion

Post Thu Jan 12, 2017 5:58 pm 
 View user's profile Send private message
  Display posts from previous:      

Forum Jump:
Jump to:  

Post new topic   Reply to topic
Page 1 of 1


Forum Rules:
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

 

Last Thread | Next Thread  >
Powered by phpBB: © 2001 phpBB Group
millenniumFalcon Template By Vereor.