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HSD Group - NSW
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marto
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Joined: 08 Jul 2004
Posts: 5459
Location: Brisbane, QLD


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Progress is progress.

We all dream big when we started out but its a lot harder then it looks. But better to aim high even if it takes you a while to get there.

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

Post Mon Jun 13, 2011 2:33 pm 
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frogbiscuit



Joined: 26 Aug 2010
Posts: 82
Location: Wollongong


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Finally got all the major parts together to get an overall idea of the finished product.
Arg, 17.5kg.
Looks like i gotta start over, or else find some lightweight action.

Post Sat Jul 30, 2011 3:41 pm 
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Jaemus
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Joined: 01 Apr 2009
Posts: 2674
Location: NSW


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My favourite technique is to drill lots of holes in things until they are lighter!

usually results in them also being weaker but you have to break some eggs to make an omelette you see Razz
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<Patrician|Away> what does your robot do, sam
<bovril> it collects data about the surrounding environment, then discards it and drives into walls

Post Sun Jul 31, 2011 9:38 am 
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Nick
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Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW


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What most experienced builders do is come up with the design and then start a very detailed spreadsheet of parts and their weights - its the only way any of my robots stay remotely near to the weight limits and many times a design gets scrapped or radically changed.

The weight list needs to account for every nut and screw, cabling etc, but you can get most of that info from the supplier web sites.

Post Sun Jul 31, 2011 11:49 am 
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Glen
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Joined: 16 Jun 2004
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Location: Where you least expect


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Yeah 17 half kg is beyond reduction i fear unless you've designed it from 20mm steel plate or something. Time for a rethink Smile

Got any pics or designs of what it currently is?
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Post Sun Jul 31, 2011 11:53 am 
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Nick
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Joined: 16 Jun 2004
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Location: Sydney, NSW


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Perhaps its time to look at omniwheels again; that would save heaps of weight and achieve the same result. If you want a second opinion on anything just post the info here.

Post Sun Jul 31, 2011 12:04 pm 
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frogbiscuit



Joined: 26 Aug 2010
Posts: 82
Location: Wollongong


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Still overweight.
Found that you can only go so far gouging chunks with a holesaw, I saved 250g and nowhere near the 4kg needed. The weight has to be established at a more fundamental level. Guess I'll have to re-think the chassis and/or drivetrain.

Weapon is now fully functional, a joy to watch. After some evolution its more of a captive trebuchet. A single linear actuator retracts to cock it and then extends to trigger.

Post Sun Aug 21, 2011 10:49 am 
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dyrodium
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Joined: 24 Aug 2004
Posts: 6476
Location: Sydney


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Sounds cool, would love pic/vid. Perhaps intially you can simply make a simple standard weapon platform to test the effectiveness? Smile
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Post Sun Aug 21, 2011 11:50 am 
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frogbiscuit



Joined: 26 Aug 2010
Posts: 82
Location: Wollongong


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http://s1116.photobucket.com/albums/k566/frogbiscuit001/?action=view&current=trebuchetstatictest1.mp4

Post Sat Sep 17, 2011 3:51 pm 
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Nick
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Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW


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That looks like some top-end machining work! My only advice would be to make it reload faster - the other bots will be wearing you down while the weapon resets and unless it is totally devastating, the opponents will beat you before you get to damage them. 10 out of 10 for originality.

Post Sat Sep 17, 2011 4:06 pm 
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Jaemus
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Joined: 01 Apr 2009
Posts: 2674
Location: NSW


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interesting stuff! might be able to speed it up with more volts if the actuator can take it, and some fine tuning of the trigger / release mechanism. Alternatively hydraulics or pneumatics may be faster

are you planning to deploy it as an axe/hammer overhead weapon like the video suggests or as a flipper?
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<Patrician|Away> what does your robot do, sam
<bovril> it collects data about the surrounding environment, then discards it and drives into walls

Post Sat Sep 17, 2011 4:29 pm 
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miles&Jules
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Joined: 19 May 2010
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Location: ipswich QLD


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Hey looks cool!!! is it spring loaded? ...and a motor resets the spring?...vid was having trouble playing back on my computer.
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Post Sat Sep 17, 2011 6:02 pm 
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frogbiscuit



Joined: 26 Aug 2010
Posts: 82
Location: Wollongong


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Nick:
There's a drillmotor and M8 threaded rod for a leadscrew. A real ball bearing screw would be better. So is it not plausible to duck-and dodge while the weapon locks & loads?

Jaemus:
I was thinking of a spike-studded steel ball on a short chain.

M&J:
A single linac loads and fires the weapon. It took some mechanical contriving to do that.

Footnote:
Haven't done anything in the last month, just chase up a vodeo camera. Don't you hate it when real life impinges on you robot life?

Post Sat Sep 17, 2011 10:17 pm 
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frogbiscuit



Joined: 26 Aug 2010
Posts: 82
Location: Wollongong


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Raised voltage to 12V motor from 10 to 14V
Also, greased screw.

That hand-drilled coupling really sounds eccentric now. Wish I had a lathe.



http://s1116.photobucket.com/albums/k566/frogbiscuit001/?action=view&current=trebuchetstatictest2.mp4

Post Mon Sep 19, 2011 11:04 am 
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Jaemus
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Joined: 01 Apr 2009
Posts: 2674
Location: NSW


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That's considerably better. I'd consider going to 18V if you can though!

So is there some way to automate the reloading / firing process? It seems to me that you are doing the following (correct if im wrong)

1) bar is down
2) see this and position radio stick to retract bar
3) see the bar is fully retracted, then reverse stick to advance to point just prior to release
4) based on knowing how long this takes, stop before release occurs
5) move stick again to release (some lag here)

i would suggest that using microswitches and relays or a microcontroller, automate this such that you can have it retract and then cock itself again automatically, and then perhaps light a bright LED to make it very obvious it's ready to be fired

because there's no way you're going to be able to work out what its up to exactly during a match, which will result in a punishingly lengthy misfire and reset process if you overshoot it's cocked position and fire it unwillingly
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<Patrician|Away> what does your robot do, sam
<bovril> it collects data about the surrounding environment, then discards it and drives into walls

Post Mon Sep 19, 2011 11:23 am 
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