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Flamin Heck - Chunkulator - NSW
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Experienced Roboteer

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

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I saw another gas lighting trick years ago: with the bot stationary, leave the gas on for maybe 10 sec before igniting it. If everything works just right you get an expanding flame front that travels quite a distance over the floor Cool.
Australian 2015 Featherweight champion
UK 2016 Gladiator champion

Last edited by Nick on Tue Feb 07, 2017 11:23 pm; edited 1 time in total

Post Sun Feb 05, 2017 9:28 pm 
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Experienced Roboteer

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

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Drive vid looks great!
Miles Blow - Julie Pitts

-Pickasso- Vivid Sportsman champion 2015

Post Tue Feb 07, 2017 10:38 pm 
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Joined: 27 Jul 2016
Posts: 219

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Managed to get my custom gas/ignition micro programmed up this evening as follows:

1. If gas is off and radio says turn on, switch on ignition immediately, pulse gas on for a short time (say 100ms) then turn gas off for a short time (say 100ms) for gas concentration to reduce to ignition point at sparker. Turn gas on again for main burn.

2. If radio says turn off, turn everything off.

3. If radio goes away (no PWM pulse for say 100ms), failsafe by switching gas off. Leave ignition on for about 1s to maximise the chance that any expelled gas has been burnt (you don't want a rogue robot sitting in an area full of unburnt propane). However, you don't want to approach the robot with the igniter running either - it's a taser and will give you a decent jolt.

I'm trying point 1 because I found that at full gas pressure the point at which the gas/air mix was right for ignition was way out in front of the robot. This meant I had to reduce gas pressure by turning down the gas tap to get it to ignite. However, what I want is to temporarily reduce gas pressure by pulsing the gas solenoid to achieve ignition and then burn at full pressure. It makes a pretty sick flame at full pressure!

Just got the firmware working, so over the next day or so I'll put the blowtorch back in the robot and give it a try.

Post Wed Feb 08, 2017 10:16 pm 
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