www.robowars.org

RoboWars Australia Forum Index -> Off-Topic

Using starter motor with chain system for cutter (weapon)


Post new topic   Reply to topic
  Author    Thread
anshulmahale1



Joined: 20 Jan 2014
Posts: 6


 Reply with quote  
Using starter motor with chain system for cutter (weapon)

i have fitted a pivot to car starter motor and chain to it and fitted to a drum cutter , for my robot. but my starter motor which is in good condition works for just a few seconds and as the wire heats it stops and then after cooling down of wire it again starts. any solution for this. i have tried a wire of 10sqmm gauge copper.

Post Wed Jan 22, 2014 2:54 am 
 View user's profile Send private message Send e-mail
Nick
Experienced Roboteer


Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW


 Reply with quote  

Starter motors are a bad choice to power weapons; they are only meant to run for short periods and will overheat quickly, as you are seeing. The motor may have a thermal cut-out inside it that is stopping the motor before it overheats too much.

If you can tell us a bit more about the weapon (weight, diameter, RPM, etc.) then we can probably suggest the best type of motor for you.

Post Wed Jan 22, 2014 9:07 am 
 View user's profile Send private message
Valen
Experienced Roboteer


Joined: 07 Jul 2004
Posts: 4436
Location: Sydney


 Reply with quote  

sounds more like an internal polyfuse or something than a hot wire.
Normally hot wires just get hotter.
_________________
Mechanical engineers build weapons, civil engineers build targets

Post Wed Jan 22, 2014 12:03 pm 
 View user's profile Send private message Visit poster's website AIM Address Yahoo Messenger MSN Messenger ICQ Number
anshulmahale1



Joined: 20 Jan 2014
Posts: 6


 Reply with quote  
Using starter motor with chain system for cutter (weapon)

i have already fixed the motor nd it gives a very good out put. and it doesnt have any thermal control. its a simple brush motor. prob is that the wire is not supporting. incase any body can suggest anything about wires incase u suggest any other motor than, its a 500 g, drum cutter

Post Thu Jan 23, 2014 1:25 am 
 View user's profile Send private message Send e-mail
Jaemus
Experienced Roboteer


Joined: 01 Apr 2009
Posts: 2674
Location: NSW


 Reply with quote  

Thicker wire?
_________________
<Patrician|Away> what does your robot do, sam
<bovril> it collects data about the surrounding environment, then discards it and drives into walls

Post Thu Jan 23, 2014 12:48 pm 
 View user's profile Send private message Send e-mail MSN Messenger
Nick
Experienced Roboteer


Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW


 Reply with quote  

10sq mm is around 8 to 10 gauge wire - if that is heating up too much then even if thicker wire helps, the current draw is so high that huge batteries will be needed to power the motor for a whole match. Do you really mean the drum weights 500 grams? that is tiny to be powered by a starter motor!

Just having the wiring get hot will not stop the motor running - something else must also be overheating and going open-circuit. What type of battery are you using?

Post Thu Jan 23, 2014 3:40 pm 
 View user's profile Send private message
anshulmahale1



Joined: 20 Jan 2014
Posts: 6


 Reply with quote  

i m using a car battery. and according to a electrician the motor is perfectly fine

Post Fri Jan 24, 2014 1:01 am 
 View user's profile Send private message Send e-mail
miles&Jules
Experienced Roboteer


Joined: 19 May 2010
Posts: 3973
Location: ipswich QLD


 Reply with quote  

The other problem is starter motors are usually to heavy for feathers…what size bot are you building?
_________________
Miles Blow - Julie Pitts
www.mulesfilm.com.au
www.wombokforest.com.au

-Pickasso- Vivid Sportsman champion 2015

Post Fri Jan 24, 2014 1:16 am 
 View user's profile Send private message Send e-mail Visit poster's website
Nick
Experienced Roboteer


Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW


 Reply with quote  

With a car battery's weight, it definitely isn't a feather!

I really can't think of a reason why the motor is stopping. Does it slow down before it stops, or does it just stop suddenly?

Post Fri Jan 24, 2014 8:36 am 
 View user's profile Send private message
anshulmahale1



Joined: 20 Jan 2014
Posts: 6


 Reply with quote  

my bot dimensions are 50 X 50 X 30 and batteries arent on the bot, its a wired bot as we have wired bot competitions in india

Post Sun Jan 26, 2014 1:04 am 
 View user's profile Send private message Send e-mail
  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.