RogueTwo Robots

[calumco]

Re: RogueTwo Robots

jamie looking really good

out of interest how heavy is your outer hardox armour?

[RogueTwoRobots]

Re: RogueTwo Robots

Cheers Calum
Not sure on the weight, but I'll find out tomorrow and let you know.

So what you taking to the champs? Drum or crusher I hope?

[calumco]

Re: RogueTwo Robots

cheers, robot with a beater hopefully was going to be having the same kinda hardox armour around the back and sides too so just wondered what yours weighed, i need to get a bit of a move on with getting it made really lol

[RogueTwoRobots]

Re: RogueTwo Robots

Weighed the armour tonight Calum. Currently comes in at 2.62kg, and I've still to add some pointy triangle bits on the back and sides to stop the robot resting there.

Update

Been considering my drum options yesterday and today, and in the end I decided to mix and match the two drums that I have. The bar-tooth drum that I ran at the 2010 champs was pretty well balanced when it was running off the brushless, until I smashed a tooth off of it anyway
So to save having to wrangle with the current drum to try and get it balanced, I figured it'd be easier and more reliable to just settle for the bar teeth.

First things first, I needed the new endcaps (the ones Kenny made) off the current drum, so out came the angle grinder. This was followed by a lot of hammering, bashing and a few choice swear words, but eventually managed to get them free:



Then I needed the old bar-tooth drum. I ditched the aluminium outer tube, sat the titanium endcaps to the side and un-bolted and cleaned up the teeth, along with the salvaged endcaps:



Put it all together and voila:



Still need to weld it but already I can tell it'll a huge step forward to reducing the erratic vibrations of the robot which will make controlling it much easier. This drum weighs roughly the same as the one it's replaced (~2.3kg) so it's not a huge difference, although it will probably be less potent.

So the aim is to get that finished off at the weekend, along with the rest of the armour (5kg worth of welding rods arrived today ). Fingers crossed it'll just need a paint come the end of the weekend.

[typhoon_driver]

Re: RogueTwo Robots

can i get those titanium end caps back? Will need them if i ever rebuild hornet 2

[RogueTwoRobots]

Re: RogueTwo Robots

No probs, will bring 'em to the champs.

[typhoon_driver]

Re: RogueTwo Robots

it's looking less and less likely that i'll be at the champs sadly but i'll get them off you the next time i see you

[typhoon_driver]

Re: RogueTwo Robots

o and you could go for a single tooth config with the bar teeth. Have a quarter of the bar on either side with a half in the center on the opposite side. Dynamically and statically balanced and deadly

[RogueTwoRobots]

Re: RogueTwo Robots

Oooh, that's a possibility *ponders*
I'll have to think it through, as the hardox bars make up a fair bit of the weight of the drum and with a (--__--) configuration, I'd effectively be taking one of the bars off. Will check the weight of them next time I'm in the workshop and have a think.

And I've got tonnes of jiffy bags kicking about and remember your address, so I'll just stick those endcaps in a bag and mail them to you.

[typhoon_driver]

Re: RogueTwo Robots

Good point although it's always better to have an effective energy delivery system with a lower kinetic energy than a higher kinetic energy but poorer delivery system.

[RogueTwoRobots]

Re: RogueTwo Robots

Update

In the end I just decided to stick with the two teeth rather than splitting them up. Welded the bars in place, but despite trying to get them welded on 180° apart, the drum still seemed to be heavy on one side and attempts to balance it out with angle grinding didn't work too well. So tried the swiss-cheese approach and it now seems to run quite smoothly (still a little bit of vibration but not enough to affect the control)
And yes, I know my welding's pish:



Also welded on some pointy bits (6mm steel) to stop the robot from resting on its side or its back if it gets flipped or does a gyro-dance. The welding was a little better here:



Going to move on to testing now, see if that flags up any weaknesses, and then pull everything apart to check every connector, screw, joint etc. It'll then get re-assembled in preparation for the champs and given a coat of paint. After that, it'll be completely done

And if you work in a confined space, don't spend hours angle grinding bits of metal. Took me three hours tonight to remove the layer of metal dust that had attached itself to everything!

[PJ-27]

Re: RogueTwo Robots

Shame your 3 tooth drum didn't work out, it looked very neat and deadly.

[jonny]

Re: RogueTwo Robots

make the drum longer and go back to a 4 tooth backbite drum

[calumco]

Re: RogueTwo Robots

haha jamie you'll soon learn to aim your grinding sparks into a designated corner of your shed rather than just any direction :P

looking through this wants me to get my spinner on the go (Y)

[RogueTwoRobots]

Re: RogueTwo Robots

Haha, I do generally aim the sparks into the one bare corner of the workshop, but because it's only an 8' x 6' shed, the metal dust created just settles everywhere. Most of the grinding's done now and the weather's getting better so no need to mess up my precious shed again

After the champs I plan on cutting/grinding the teeth off that drum, getting another tooth made and going back to a 4-tooth drum. A wider drum would need a new chassis though, and having just spent ages getting this one done, that's something I'm not prepared to do yet. The current drum length will be fine anyway, I can just stick the two middle teeth together to make one thick tooth in the middle and two on the ends.