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Spyro the Dragon - VIC


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Cyber



Joined: 26 Aug 2015
Posts: 59
Location: Melbourne


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Spyro the Dragon - VIC

Pictured below is the initial design for my robot. I envisioned a four-wheeled, tank-steer design which used two 100W electric scooter motors and chain drive.

(click link to view full image)

http://tanglesgaming.com/blog/wp-content/uploads/2016/01/2015-10-27-14.48.49.jpg

The design has since evolved into only having two wheels due to challenges with chain drive setups, difficulty accessing a welder to build the frame and the limit on weight (13.6kg / 30lbs). The design is made up of modular components which can each be easily removed from the robot with just a few bolts:

– The left and right wheel/motor assemblies
– The ‘electronics box’, which contains the motor controller and radio receiver (in future: telemetry controller and transmitter)
– The weapon module

Due to moving away from the four wheel design I have dropped the angled section around the wheels in favour of a square shape to provide additional points to anchor the weapon module to the drive module.


http://tanglesgaming.com/blog/wp-content/uploads/2016/01/2015-12-26-20.58.46.jpg
the square drive module NOTE the sprockets do line up when properly attached Smile


http://tanglesgaming.com/blog/wp-content/uploads/2016/01/2015-12-26-20.59.03.jpg
electronics box connectors


http://tanglesgaming.com/blog/wp-content/uploads/2016/01/2015-12-26-21.40.28.jpg
test fit of modules into frame

Unfortunately the motors can’t be removed without removing both the wheel/motor assembly from the robot and the sprocket from the motor, however I could address this with a minor change to the bracket which is just a short section of plate steel.


http://tanglesgaming.com/blog/wp-content/uploads/2016/01/2015-12-26-20.58.21.jpg
motor mount bracket


http://tanglesgaming.com/blog/wp-content/uploads/2016/01/2015-12-26-20.58.32.jpg
wheel spacer - washers welded together

The axles are retained with R clips making it possible to remove the wheels without disassembling the robot.


http://tanglesgaming.com/blog/wp-content/uploads/2016/01/2015-12-26-20.58.40.jpg
axle retained by r-clip

The above collectively forms the rear half of the robot. The weapon will form the front half and can be unbolted to attach different weapons or armour quickly between rounds. The weapon will carry its own power and fuel source (depending) and links to the receiver to control its activation.

YouTube - "Testing Spyro's drive module"
https://www.youtube.com/watch?v=s6ZmYSbDJ3I

– Spyro is powered by a single 22.2V 6S LiPo battery. It is small but sufficient to run the bot for a full 3 minute round.
– Spyro’s motors are controlled by an IBC
– The motors are 100W 24V DC electric scooter motors from Motion Dynamics and are supplied with sprockets to suit #25 chain
– The wheels are electric scooter wheels and came with the sprockets fitted from eBay, as did the chain and master-links.

Currently weighs in just under 6kg... got another 7 to play with Smile

At this stage Spyro’s primary weapon will be a flamethrower, because everybody loves a good fireball. The theme of the robot (hence its name and choice of weapon) will be “Spyro the Dragon”. It will have a paint job to match!

A telemetry system with accompanying heads-up display is planned and has been successfully tested on the bench with sensors. Demo is here: tanglesgaming.com/esp8266_test This system uses an ESP8266 microcontroller to host a web server over wi-fi, meaning the HUD can be viewed using a laptop, tablet, mobile or other wifi-enabled device with a web browser.

Thanks all for the advice about using chains!

More to come as the build progresses

Post Sat Jan 02, 2016 1:20 am 
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marto
Experienced Roboteer


Joined: 08 Jul 2004
Posts: 5459
Location: Brisbane, QLD


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Looking good. What is the plan for armour?
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Steven Martin
Twisted Constructions
http://www.botbitz.com

Post Sat Jan 02, 2016 5:26 am 
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Cyber



Joined: 26 Aug 2015
Posts: 59
Location: Melbourne


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quote:
Originally posted by marto:
Looking good. What is the plan for armour?


at the moment, depending on how much weight I have left to play with I'm thinking flat steel down the sides and aluminium top and bottom. nothing special for now as I'll probably redesign the frame in the near future Smile

Post Sat Jan 09, 2016 3:17 pm 
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marto
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Joined: 08 Jul 2004
Posts: 5459
Location: Brisbane, QLD


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Is that a new IBC?

Steve
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Steven Martin
Twisted Constructions
http://www.botbitz.com

Post Sat Jan 09, 2016 4:02 pm 
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Cyber



Joined: 26 Aug 2015
Posts: 59
Location: Melbourne


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Its the v2I believe, couple of years old

Post Sat Jan 09, 2016 4:23 pm 
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marto
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Joined: 08 Jul 2004
Posts: 5459
Location: Brisbane, QLD


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How's the build progressing?
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Steven Martin
Twisted Constructions
http://www.botbitz.com

Post Sun Mar 13, 2016 9:00 pm 
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