Author Topic: Massacre & Friends  (Read 47328 times)

Harry Hills

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Massacre & Friends
« on: January 28, 2015, 10:08:15 am »
Hi, I'm Harry and I'm an alcoholic.

Been building robots for a while now. Will give a brief run down of some of the more recent, less cringey ones.



150g eggbeater antweight. Beater was made out of nitride hardened p20. Weighs about 70g or so. Never was very good because weight distribution was terrible and construction was pre mill and pretty poor.



This was my beetle, actually called Eggbeater because that got engraved on the beater for some reason. First version was pretty suck. 17mm grade 5 titanium beater powered by a stupid large HK outrunner. Sucked hella power and never drove properly



The second version was the first robot I made on my small hobby milling machine. Made out of some horrible blue plastic because n00b. It sucked still for a few reasons and was mostly overweight.



Third version was a good improvement. Still not particularly special. Can read the build in full here http://bodgeitandhope.blogspot.co.uk/2014/09/beetlesbeetlesbeetles.html

failed at combat too.

https://www.youtube.com/watch?v=sOn9gR_ceBk&list=LLH7A1bjGSe3wc4Q0S0WUYrQ&index=11

Red Wedding is my other beetle. It should make people cry like its namesake. Disc designed by Ellis Ware.





My main feather is an overhead bar spinner called Massacre. It failed pretty hard at its last event. The bar got bent, and the baseplate caved in. But it was a learning curve.
Link to the fight that really messed it up here: NSFW contains robogore and shattered dreams https://www.youtube.com/watch?v=PYx52Z3oe5I  The beater that hit it never quite worked the same though and ate its own bearings every fight after this.
 If you are so inclined you can read its build starting here: http://bodgeitandhope.blogspot.co.uk/2014/02/massacre-build-part-one.html

New version is underway.





Some parts layout and whatnot. This is what I'll probably document this build here when my robot marketplace order and lumps of titanium show up. Can give more spec on anything if anyone is interested.

Cheers all. Harry.

Koolaid64

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Re: Massacre & Friends
« Reply #1 on: January 28, 2015, 10:48:04 am »
If there is a better way to bend a bar I can't think of it. nice looking bots and nice fights.
-Kyle

Harry Hills

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Re: Massacre & Friends
« Reply #2 on: February 03, 2015, 02:49:55 pm »
Had a day off monday so smashed out some gearbox plates for the weapon system. Roughing endmills are awesome. Cut 6082 easy as anything.

Plates are accurate to least .03mm on the outer dimensions(despite not looking it) the hole patterns less so. I suck at hole patterns/precision.

Apologies for rubbishy phone pictures.



The plate I used was kind of ratty. I might end up facing .25mm or so off to bring its shine back.



Shoved in robot for Pretend-O-Bot effect. The thing is made out of 3 plates of 5mm alu nutstripped together to form U channel. I'm probably going to run a dead shaft and bore out the gear and the pulley for some needle roller bearings.

The inrunner gets a custom faceplate for sure and hopefully a custom rear end too. I never liked it hanging in the breeze so will try and fabricate some kind of aluminum/titanium jockstrap for it.

Koolaid64

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Re: Massacre & Friends
« Reply #3 on: February 03, 2015, 10:06:06 pm »
looking very clean. Is that massive bearing just for the sake of low profile or are there alternative reasons?
-Kyle

Harry Hills

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Re: Massacre & Friends
« Reply #4 on: February 04, 2015, 08:15:31 am »
Massive bearing is massive because the bore has to match the OD of the weapon pulley. I'm running both a live and a dead shaft system ontop of eachother in the hope that that makes for strong weapon system. There is a 25mm dead shaft with roller bearings in the centre (center for you guys) that supports from the inside then the large bearing supports the outside.



Also the bearings were kind of cheap. Some places wanted like 90 quid for them but I managed to find some for 13 euro so bought a few as spares.

Also my Robot Marketplace order seems to have shipped now. Yay colsons

BranYoung

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Re: Massacre & Friends
« Reply #5 on: February 04, 2015, 08:42:00 am »
Is that weapon motor connected to a right angle gearbox or is it friction-driven?

Harry Hills

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Re: Massacre & Friends
« Reply #6 on: February 04, 2015, 09:27:57 am »
Right angle gearbox. Belt not modeled because laziness. I hate friction systems.

Lucas Grell

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Re: Massacre & Friends
« Reply #7 on: February 06, 2015, 03:31:02 pm »
That bot looks great, can you post more pictures as it progresses? The only question I have is whether or not you'll have any armor or the like on it, or rather, is that the complete model or just a frame?

Harry Hills

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Re: Massacre & Friends
« Reply #8 on: February 06, 2015, 04:12:19 pm »
Yeah everyone will get sick of the picturespam when I get the ball rolling on this.

Probably not much more armour, there will be a steel wearplate wedge but I'm not sure I'll have the weight left for anything else. And it just looks so gosh darn swaggy with exposed wheels. 

zacodonnell

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Re: Massacre & Friends
« Reply #9 on: February 06, 2015, 05:20:00 pm »
The bearing around the weapon pulley setup is pretty cool. That's a clever way to get more support out of the same height so you can keep the bar low.  Are you planning to change the thickness / shape of the bar to avoid the propeller effect? The tie in with the rest of the frame makes me think that center post warpage is not going to be in the top 10 failure modes for this bot.

-Zac


Lucas Grell

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Re: Massacre & Friends
« Reply #10 on: February 06, 2015, 05:24:55 pm »
I feel like you could get some wheel guards on there if you thinned the sides a bit, how thick are they, anyways?

Harry Hills

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Re: Massacre & Friends
« Reply #11 on: February 06, 2015, 06:24:19 pm »
15mm (roughly .59" for the metrically challenged) Alumec 89

About the bar, I'm not sure what you mean by propeller effect, twisting or distorting maybes? Stiffener and a non rubbish material should prevent that...hopefully.
« Last Edit: February 06, 2015, 06:28:00 pm by Harry Hills »

Koolaid64

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Re: Massacre & Friends
« Reply #12 on: February 06, 2015, 06:27:32 pm »
the spinning death bar is wheel guard enough.

Harry Hills

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Re: Massacre & Friends
« Reply #13 on: February 06, 2015, 06:29:42 pm »
^this.

I'm hoping that so long as I'm spinning the Keep Away Zone is enough to prevent too much damage. I'd be worried if we had an undercutter signed up for the comp.

Lucas Grell

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Re: Massacre & Friends
« Reply #14 on: February 06, 2015, 07:52:51 pm »
I suppose, it'd just be a shame if something tore a wheel off, I've never obeyed the keep away zone myself.
I'm not metrically challenged, I just spent a few hours modeling an outrunner made to metric dimensions with an imperial caliper.
http://i.imgur.com/B9VD2Mp.jpg
Didn't want to post a huge random picture on your thread.
« Last Edit: February 06, 2015, 08:12:15 pm by Lucas Grell »