Rukia (FW)

Here I go again, rebuilding Rukia for a third time.

For those who don't know about Rukia, she started as a 4 wheel drive rambot concept then I change it to a 4-bar lifter which it looked like the love child of Biohazard & Panic Attack.

Here's what the last build looks like.
[attachment=0:27k0akh8]IMG_1791.JPG[/attachment:27k0akh8]

It's 18 inches long and 16 inches wide.

Problem one, the Linear Actuator is 14 inches long with a 4 inch stroke
too long for my 4-bar lifter and I can't buy a smaller version of it any more and can't find a replacement for it.

Problem two, the shaft's for the 35W motor's I made are crap, the 4mm square bar I put in is not straight and you can guess from there.

Last problem is, the wheel's are not in line, so yea I didn't do a good job there.

So back to the drawing board, I'm still thinking up some designs. I may do a Panic Attack like featherweight or King Buxton, not sure yet.

I'm just making this post just to say Rukia is not dead I still plan to build her.

So I'm been messing about, what to do with Rukia, and at the end I have made a decision to keep the original 4-bar lifter design.

I have found a new Linear Actuator, much more smaller than the one I have. The actuator I'm looking at is the one from Gimson Robotics, but I want a 3 inches stroke they only have 2,4 and higher.

i'm sure you could add some sort of limiter onto a 4 stroke gimson. for example you could probably add stops to the front bars to stop them moving forward the full amount.

I'll think of something.

Update

I did a lot today, cut up the 15mm Nylon 6 even though I ordered 12mm :lame: and cut up the 4mm aluminium plate.
[attachment=1:1ybp6wk2]IMG_1835.JPG[/attachment:1ybp6wk2]
As you can see the size difference between the two, Rukia is now just under 16 inches long , just over 16 inches wide and 9cm tall.
[attachment=0:1ybp6wk2]IMG_1836.JPG[/attachment:1ybp6wk2]
I don't think I need two battery's. One battery should be powerful enough to run more that 3-4 minutes, they are 4600mah Ni-MH battery's.

A much more practical size! The previous version would have dwarfed most featherweights. Looks like you have a well planned, measured approach to building. Looking good!

As for the batteries, you'll easily run one battle, probably two, maybe even three with 4.6ah. Tormenta 1 had five 12v drills (overvolted to 18v) with a total of 5ah batteries. We charged once across Friday, Saturday and Sunday at the champs (7 battles total), and we only actually put 1ah back in. We still have loads of capacity left even now, having run all sorts of tests with the batteries since then.

Point being, 4.6ah will be ample (lol). If you have the weight, though, you may want to run both batteries. Putting them in parallel would mean you'd only have to charge once in a blue moon, but not only that you'd have double the discharge rate available. I don't know what those motors pull at stall, but it's likely to be near 15a or maybe more. Those NiMH packs are rated to around 30a I believe. Slamming drive on from a standing start might blip the demand beyond a single battery's abilities. Having two batteries could potentially improve drive power.

Then again, truth is, a single battery would be perfectly good, I'm just blabbering. :lol:

Keep it up!

Update

I have wired it all up now, pain in the arse to keep the batteries in parallel and do.

All that's left is to put it together and get a new Linear Actuator, because the one I have will interfere with the arm, so I'm getting a Tube Actuator it's 11 inches long but I can make it work.
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Looking good, nice design and well thought out build.

Not much been done, just made the arm and mount it. I have bolt down the battery's and ESC's.

As it is now, it's 7.5kg heavy. And I'm waiting for the shaft to be made, so I can continue building.

I'm just hope I can put on the 4mm mid steel armor with 4mm 6082 aluminium top.

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Arm is looking great! And that's pretty high for a four bar. Can't wait to see it in action!

Rukia is up and running. At this point Rukia is 8.9 KG heavy so that means, no steel armour but worry not, that it will have 6mm aluminium armour with a 4mm steel front.

One thing though is that when I was finish test driving her, the grub screw on the wheels came undone.
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[attachment=0:1r93e3xv]IMG_1869.JPG[/attachment:1r93e3xv]

I need a little bit of help. My fail safe is not activating, It's fine when the robot is not moving but, when moving around, turn off the transmitter it go's into forward gear.

Right now the controls are how I want them, the right stick for moving all directions and the left for the weapon.

The Scorpion XL is set-up like this. The FP/COMM is in the THRO, the LEFT is in the ELEV, the right is in the AILE and last the weapon ESC is in the RUDD.

I have DX5e with a AR600.

Try unplugging the one in the throttle channel, you should only need the left/right ones connected.

Still doing the same thing :lame:

This is weird, I put right, into the THRO, the fail safe work's but leave's the controls in a mess and, you can put the left in the THRO as well and the fail safe will work. But put the right and left in, the ELEV and AILE, and it will go. FAIL SAFE DO NOT WANT!.

Try recalibrating the XL. I've found in the past that if I calibrate it with all the servo leads plugged in, and then take one out later on, it doesn't behave entirely like it should. So make sure all the servo leads that you are wanting to use are plugged into your receiver, then recalibrate the XL. It may or may not solve the problem, just an idea.

The only other thing I could suggest is that if there is some sort of failsafe setting built in to your tx/rx then it could be wrestling with the XL failsafes, but having not used a DX5e or AR600 I don't know if that's the case.

Hey, just wanted to quickly know how you're holding all the plastic together?

Looking very nice btw!

Quote:

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Originally Posted by Mokichi

Hey, just wanted to quickly know how you're holding all the plastic together?

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I'm using M4 countersunk screws. Before you screw them into the plastic, drill a 2mm hole so that the screws will just go in easily and have some direction.

Spektrum Rxs output a false signal on startup, which will throw out your calibration if it calibrates at the same time.
I had this problem with Saberteeth.

Solution? I think I turned the auto calibration off, and just relied on my trims and Rx settings to failsafe.

Well I got my fail safe to work, but the controls are off.

To go forward, I have to point the stick to north east , same go's for the other directions.

Your mixer isn't working

Update

At last I got off my lazy arse and did some work. I have cut, drilled and screwed on the armour plates just need to do the arm now.

I have also go a new ESC same make and model and guess what, It's still doing the same thing... great :x
[attachment=0:3au8o698]IMG_1976.JPG[/attachment:3au8o698]
She looks like a mix of S7 Hydra and Mortis. Still need to put on some paint.

She will be ready for the Flintshire event.

She's done.
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Yeah I know the arm is not in line but hey, It's only my second robot and I'm not that good at maths. :lol:

She weights 12.8KG, and is able lift a FW easily.

See you all at Wales.

It's looking brilliant Lewis, look forward to seeing it compete in Wales.
How long does it take for the lifter to complete its travel?

With no load, It fully travels at 7 sec. I was going to put a 14V linear actuator from Gimson Robotics but they sold out, now they only have a 18V version and I don't know If that will work well.

I just hope I can get my ESC working when I get there.

Looks brilliant! Look forward to videos. :)

If Tormenta were running we could have been best buddies. :lol:

The failsafing problem on Rukia got fixed. Lewis was using a AR600 which doesn't failsafe on all channels. We borrowed an AR500 from Craig (Saint) and it worked fine.

brilliant design and physics applied :O Really amazing. I am building my first combat robot (2nd actually--first wasnt good enough).
I also wanted to put a weapon like your's - A four bar flipper like in biohazard.. but mine is very very weak.. its underpowered...can you help me ?
please see my post 'untitled robot'

I thought I'll talk about Rukia's performance at the event, all I can say is it was ok. The biggest problem was the 35w bosch motors and the grub screws that came undone. And the lifter was too slow.

The question is, were to go from here? Part of me wants to strip down all the electrical components and replace them, but I need to find small yet powerful motors and have a custom gearbox made, so they can be mounted side ways.

The other option is to build a new, CO2 powered 4 bar version. But this requires some studying.
[attachment=0:24dbg378]IMG_1997.JPG[/attachment:24dbg378]
Look battle scars!

I like to thank Dave for helping me out once again, and to thank Craig for letting me borrow his spare AR500.

maybe you could use something like this to change the angle of the drive and then use a drill unit to run it

http://www.ebay.co.uk/itm/Toolzone-Prof ... 20c79e55ed

http://www.ebay.co.uk/itm/OFFSET-SCREWD ... 3f1de50837

or you could use an angle drill unit like this

http://www.kingtools.co.uk/product.php/ ... //sn/49397

that's if there's enough space

Well the motors I have are 120mm long with gearbox. So it's a tight fit.

The products you have showed me, maybe too big.

the gyro can go anywhere in the robot and there only about 30mm square

Gyro? Rukia's got 4 wheels, a gyro is not needed. Mr.Pink is the one who need a gyro with his uncontrolled drifting. :lol:

Quote:

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Originally Posted by JammyONE

Gyro? Rukia's got 4 wheels, a gyro is not needed. Mr.Pink is the one who need a gyro with his uncontrolled drifting. :lol:

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lol sorry to many bits going on at once :roll:

Update

I thought I'll tell you all on what's going on. First, adapting new drive motors and weapon motor on Rukia. I'm drawing up the drive motors at this time and should be better than the 35w's. The weapon motor has been replace. And the speed of it, is much quicker. (about 1-2 seconds with no load)

Second, I'm gathering parts for my 4-bar flipper, known as, The War Machine Rukia. So far the parts I have are. A 50mm bore 50mm stroke Pneumatic and 20oz paintball bottle even though I ordered a 16oz.

I'm still looking for a suitable valve and something on the thread end of the Pneumatic, to connect the Pneumatic, to the weapon arm's shaft.

For the drive, I have taking an interest on the Graupner Speed 700BB Turbo 12V, I have no idea what there like.

All this Pneumatic set up looks overwhelming but still going to give it a shot.

Hey everybody, I'm back with a new robot. This is the replacement of Rukia, or a new model named 'The War Machine Rukia'.

I know I was going to build a 4-bar flipper, but I'm too lazy to learn about Pneumatic set up.

Attachment 3716

It has a 8mm Polycarbonate base with a 14x14 steel box section frame.

The weapon is a lifting arm, hopefully I can self right now.

The rest, 2x Speed 900's, 3x BotBitz 85AMP ESC's, 14.4v lipo battery and the armour, well I don't know yet.

How are you gearing the speed 900s down?