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Cutter Family - The War Lord - SA


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Ajax
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Joined: 17 Jun 2004
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Location: Sydney


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Cutter Family - The War Lord - SA

This is a little story, that needs to be told about a little boy (not fiscally, just like’s playing with toys) that, one day, had a chat with his mate and was told about ‘RoboWars’ here in Australia.
He was given the web site and his brain started ticking.
All these thought came rushing at once, design concept’s, look, weapons, etc.
Therefore, the concept for a bot started.
Due to his job a concept design, specification & risk analysis was done.

First , Write a scope of works.
The idea is to build a bot that is fast and cause’s massive amounts of damage.
In other words, everyone is too visible see the damage when it occurs.
The bot is not to be a back scratcher.
The bot has to be unique.

Second , what are the possible weapons used?
Spikes, spinners, rammer, crushers, crimpers, grippers, pounders, thwak’s, wakers, walkers, talkers, axe’s, saw’s, etc, etc
Well you get the idea.

Third , what defensive weapons are there?
Steel, steel, and more steel, spikes. Alternatively, make it so big that nothing could destroy it.

Fourth , what are the main problems?
Weight.

Fifth , what weapons cause what damage and grade damage level?
Spikes,
Minimal damage Tickle under the arms.
Very Low

Spinners
Every thing
High to Extremely high

Rammers,
Think of shoppers at a big stock take, sale at Myers. Just annoying

Etc, Well you get the Idea.

With this information collected and collated, the design concept starts.

Now just imagine.
A large high speed spinning blade around the body, a ball and chain swing from above, turbo charged engine, for the speed, and the hand of god, just to hit anything out of the way that is annoying.

Now that sounds good. BUT problems with design concept,
Weight . There goes the ‘Hand of god.’

Next, Budget.
‘Turbo charged engine,’ gone
‘Ball and chain swing from above,’ gone

Now that leaves a spinning blade around the body.

Thoughts
It is possible to make
May not, cost too much to build
Could stay under weight limit
Not unique

“NOT UNIQUE” , now this is a problem.
Solutions add a second blade spinning in the opposite direction and make the bot have the ability to drive flipped upside down or not.

Problem
Not all materials can be cut by the same blade.
Solutions design to have interchangeable blades

Final bot design concept
The bot is to be fast.
The bot is to drive upside down
Have two blades spinning in opposite directions at high speed.
Have interchangeable blades. Must be quick change.

Next the specifications.
Shape: - Round
Size: -? (Will depend on, weight class)
Chase: - Not required
Armour: - will be determine once design is completed. (Weight factor)
Movement Speed: - Fast (Doesn’t have to be the fastest.)
Blade spinning speed: - 30,000 rpm (realistically maybe 1,000 to 2,000 rpm)
Blade type: - to be researched.

Testing Spec
Cut a lump of 4 x 2 in to wood chips when dropped into path on blades.


Now that the specs are done, what weight class should this bot be designed for? Good question.
There is going to be some research and testing for this bot, so I think it will need to be, say 3kg, for the prototype. Then make one for 12kg, and if I get adventures a 25kg bot.

Naming the bot
This is simple. The baby of the group will cut your toe off, so its name is ‘Toe Cutter’
its big brother will bit your ankle, therefor ‘ Ankle Bitter’
and the mother of the group. Let’s just keep going up the leg, ‘Knee Capper.’
The name of all three together, well that’s easy

Please welcome the ‘Cutter Family’

Design
Now the design can be started.
First, what motors am I going to use? For now the XU1 for drive train, weapon still need to be sourced.
Then wheels, Bunnings red wheels for starters.
Battery SLA for now, sort out other type later.
Controller, The ‘IBC’
Remote control receiver, good question!

The shopping list is getting bigger
2 x XU1 cordless drills
1 x SLA battery (determine size later)
2 x Red Wheels
1 x IBC Controller (order when starting to build)
1 x Remote controller

and there is nothing to hold it all together.

Now as I have some of the parts I can start drawing into CAD (using SolidWorks.)
All parts are drawn and looking good, let’s set the mass parameters, so the CAD package can calculate the total mass.
Problem , Scales, I don’t have any. Add to shopping list 1 x scales.
Bought Scales 3kg max; accuracy to 1g. That will do the job.
Weigh all components and set mass properties for each drawing. Hehe it works.
Lets draw up the base and top plate, then make an assembly drawing and see how it looks.

Boring
Where’s the blade, need the blade, have to have the blade, (stop typing and draw one. Oh that’s a good idea, I might just do it.)

Now that is starting to look a bit better.

http://robowars.org/forum/album_pic.php?pic_id=159

Problem! How do I connect the blade to the body and have it spin.
Due to the size that the blade is spinning around a bush is out of the question (Mainly safety reasons due to design, review at a later date.) Time for some research

Been to a couple of bearing suppliers and found some bearings that will do the job.
A turret bearing for ‘Knee Capper’ should do the job.
Problem! Cost $300 - $400. In addition, the turret bearing is design for low speed. Testing required. Think it will be OK.

Found a bearing for ‘Toe cutter’ THK aren’t you wonderful.
Problem! Cost $2,000. Yow, that hurt. I think ‘REDESIGN’ is in order.
Still looking for ‘Ankle Bitter’ bearing.

Me tink it is time to talk to work colleges.

I WANT A BOT TO PLAY WITH NOW.
As this looks as though it is going to be more of an engineering challenge, I think it is time for plan B

Now what is plan B.
A trip to Bunnings for inspiration is required.

I have inspiration, a couple of them.
Problem! Can Petrel motors be run yet?
No prob, start a baby design that doesn’t need it, and it will become part of the ‘Pristidae Family’
Now that has you thinking doesn’t it.

Time for a new story about the ‘Pristidae Family’

I will update as advancement are made to the ‘Cutter family.’
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Post Mon Jul 19, 2004 11:33 pm 
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Spockie-Tech
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Joined: 31 May 2004
Posts: 3160
Location: Melbourne, Australia


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someone's had too much coffee Ajax.. Shocked and I thought my posts were big and rambling on occasion.. Laughing

good to see you're getting the ball rolling in the sleepy state though.. when do we see the color of your steel ? Twisted Evil

Post Mon Jul 19, 2004 11:36 pm 
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Ajax
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Joined: 17 Jun 2004
Posts: 298
Location: Sydney


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I was bored at work so I put some notes together for my bot designs
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Post Mon Jul 19, 2004 11:51 pm 
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Totaly_Recycled
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Sounding good Aj .. when can we test it out ....
ive started desghning one of my own or .... two as one was a clamp but looks like there might be too many of them poping up so might be a kinetic tpye flipper but sourcing the parts for $0 will take a few months of dump scrounging i think ..

Post Tue Jul 20, 2004 11:29 pm 
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Ajax
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Joined: 17 Jun 2004
Posts: 298
Location: Sydney


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This one is going to take some time to sort out the problems that I have.

It is becoming clear that for me to make this, with out blowing the budget for the next ten years, I have to be a little creative. Actualy a lot creative. Some of the parts may have to wait untill I get access to a lath and Mill, so I can do it my self. (Bloody work, All the tools I need but not allowed to touch. Crying or Very sad )

So I am spending most of my time on my other designs, as I will be able to complete them quicker.

I want a bot to play with.
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Post Wed Jul 21, 2004 12:06 am 
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Knightrous
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Joined: 15 Jun 2004
Posts: 8511
Location: NSW


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Ever heard of 2 drill motors, red wheels, a battery, IBC and shoving it inside a steel box with an aerial poking out the top? A simple robot that you can actually build in a few days.

Being able to design a 1000 and 1 designs is good Ajax, but hey, even I can do that Very Happy I'd like to see you make a quick trip to Gary's for the week and come home with a complete robot then wait for you ultimate designs to emerge off paper Wink
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Post Wed Jul 21, 2004 6:08 pm 
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Ajax
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Joined: 17 Jun 2004
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Location: Sydney


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quote:
Ever heard of 2 drill motors, red wheels, a battery, IBC and shoving it inside a steel box with an aerial poking out the top? A simple robot that you can actually build in a few days.


Thats call 'The Wall.' A simple design that I plan on having the body made in the naxt couple of weeks.
I also hope to have some of the parts for 'Bug Eyes' made at the same time and I am making some of the bits for 'Little Brute' at work. (A hacksaw and a file is all I need for that.)


quote:
Being able to design a 1000 and 1 designs is good Ajax, but hey, even I can do that I'd like to see you make a quick trip to Gary's for the week and come home with a complete robot then wait for you ultimate designs to emerge off paper


First of all I live in Adelaide.

Everything that I draw can and will be made. The 'Cutter Design,' I am having some technical problems with. the easiest solution is throw money at it, but I am not going to have a design that is going to cost me thousands to make.

And I have a big problem. I do not have a gararge, and due to company policy I am not allowed to use any of the companies equipment. (and they have a full tool room. Crying or Very sad ) So every thing I design I have to get made for me, and that costs, ther fore I am making sure that my designs are not hard to make. They may look complext, but there not..

And by the way. Part of my job is to design production equeipment or design modifications to the production equipment. So I do plenty of cad drawings.
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Post Wed Jul 21, 2004 9:03 pm 
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mytqik



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I assume that you are reffering to a slew type bearing to support the spining blades. You are right about being expensive, & yes they are designed for slow grinding rotation, not high speed impact.

Have you thought about placing 5 small bearings equally spaced around the inside of the blade? You could then use a nylon or UHMW plastic retaining guides top & bottom to stop the blade flying off Sad

How where you thinking of driving the blade? the only economically responsible option i can think of would be a friction drive off a drill motor.

Post Wed Jul 21, 2004 10:20 pm 
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Ajax
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Joined: 17 Jun 2004
Posts: 298
Location: Sydney


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Yep the Slew bearing is one I have looked at. There are a couple of others I am looking into as well, But I think they will be exspensive as well.

I am working on a design right now, with bearings placed around the body as you stated. But this introduces other problems, So I am drawing several options to see what the weight will work out to be.

Weight is the biggest killer for this design concept.

I have my old man looking for some ring gears for me at the moment. If he can't find any cheap no one can Laughing
Friction drive is on the drawing board as well.

At the moment I have about 5 to 10 different options for each part of the design. I am just putting them together ion different configurations to see what will work the best with out going over weight.

For the Lightweight bot I was thinking of getting some old turret bearings from a junk yard.
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Post Wed Jul 21, 2004 11:07 pm 
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