Velociraptor's Fanfic Tournament - Series 6!

[pcbore]

Velociraptors Fanfic Tournament - Series 6!

In a cone spinner, the chasis cant really support the shell without interfering with the weapon. Least I dont think so.

[mrdaves]

Velociraptors Fanfic Tournament - Series 6!

True, looking at some of the pictures of Typhoon in URR today, it looks like everything is bolted onto a metal base plate, with the centre shaft going up to spin the shell. This could be the case with Psyclone, but when you have the self-righting method to off-set everything.

[parassyte]

Velociraptors Fanfic Tournament - Series 6!

Bad Aaron! No Aaron points your you.

quote:

What motor are you using Nick, because unless its something with a good 50:1 gearing behind it, you wont be lifting anything over. Look the leverage points you have, its all negative leverage and your going to be killing the motor to get it to lift a 10kg brick with your low gearing shown in the render.

Okay. Now that youve gotten me out of the tourny,

1)It doesnt lift an entire 100kg robot at any time, not even when self-righting. Youll note that when self-righting, the point of leverage makes the job much easier, since the robots entire hull will have a center of gravity behind the fulcrum and lifting bar. So its really just repositioning most of the mass, not lifting.

2) Negative leverage... Its equally easy to lift to the horizantal as it is to lift the 12-ish degrees above the horizantal anyway, if we were picking the whole opponent up with the arm. WE ARENT.

That robot will revolve on its own axis, on the side not under the arm. It will start at the horizantal, not below. So no ill effects. Also note that many robots like No Tolerance and Battlerat work just fine, when their electric, similarly-powered lifters are below the horizantal on the tip.

Not to mention that most nearly every pneumatic flipper would be hampered by this interpretation of physics.

3) The distance of the flipper: Its not as far as it looks. The robot is relatively small.

4) The gearing is 5:1. Obviously itll waste a lot of power still, but itll work. I dont care. I can easily halve its ratio if youre going to be a ninny about it.

I dont have numerical answers to your assertion, but I am absolutely sure the lifter would work. I would never put a mechanically unsound weapon in my design. Plenty of electric lifters with similar setups have worked, so all-in-all I think youre just being a nitpick that I shouldve used a pneumatic system instead of electric. Yes, I know. I was going to, but got lazy. Sorry.

[knightrous]

Velociraptors Fanfic Tournament - Series 6!

I was unable to find my internal information for BattleRat or No Tolerence. But I still firmly believe they would have a large amount of gearing. Im not saying that just because I build robots, that my word is like laws, but, On our heavyweight robot Vertex, we have a selfrighting arm that lies across the robot to flip it over. We originally tested two torqey motors on 24v with a total reduction of 189:1 and during selrighting, the robot would still struggle to flip over and was continously breaking hardened steel gears.

Next we tried a winch motor with a custom worm reduction to make a linear actuator. The reduction around around 250:1-300:1. This failed and we ended up cooking a good motor.

The selfrighting arm is around 450mm-500mm long and we are still yet to come up with a way to get it to work with out breaking something.

Maybe you should really do some maths on the setup you have, because Im sure if you ask a few builders on any of the robotics forums, youll get a very similar answer as what Im telling you. 5:1 reduction on an S28-300 in a heavyweight with a 500mm plus lifting arm, will not work for lifting 50kg+.

You can blame me for your loss if it makes you feel better. No skin of my nose though.

[parassyte]

Velociraptors Fanfic Tournament - Series 6!

I was joking about the blame-game. That never had anything to do with the loss. Clever how you turned it around on me like that though.

But dont mind if I ask what the specifications of the motors youre using are. And when self righting, does your robot support almost all of its mass on the arm, far from the axle? If its a big symmetrical box with a lot of mass opposite the lifting end, youd be dealing with a much larger load than Im dealing with.

Im not interested in how to fix your situation. Obviously, Im not good advice on that at all, and Id probably lose you $3000 more on motors before you got any of my ideas working. (Clutch?) Im just curious how mechanically similar your situation is to mine.

I think the gearing is the only issue you have any point with, and I agree. I would fix the gears in a heartbeat. Its really easy to incorporate into the design. 250:1 is going a mite overboard, but if VGer were ever competing again, I would run it five times slower than currently at least. It wastes too much power in the current setup.

[velociraptor]

Velociraptors Fanfic Tournament - Series 6!

Just to show everybody that now the email notification is back online, I got my activation key and my normal profile is back on!

A big thank you to MHF, Dave and AJ for letting me use the THDC profile over the past month.

My exams are now over, so hopefully I can start the semifinals soon.

[matty_haka]

Velociraptors Fanfic Tournament - Series 6!

*Does wooty dance*

WB Rich

[steven_mcg]

Velociraptors Fanfic Tournament - Series 6!

Welcome back online, Mr Southworth . Now we can finally get my 6th title loss out the way

[matty_haka]

Velociraptors Fanfic Tournament - Series 6!

I wish to place a bet on all the guilt trips resulting in Mr McGs first win

[Guest]

Velociraptors Fanfic Tournament - Series 6!

WELCOME BACK RICHARD

[andrewj]

Velociraptors Fanfic Tournament - Series 6!

Welcome Back Richards account! I cant wait for the semis.

[mrdaves]

Velociraptors Fanfic Tournament - Series 6!

Hello hello hello and welcome to QI *tape stops*

Soz, wrong tape

*Inserts new tape*

Welcome back Richard on your account.

Now the wait is on till March 10.

[velociraptor]

Velociraptors Fanfic Tournament - Series 6!

Whats happening on March 10, Dave?

[Guest]

Velociraptors Fanfic Tournament - Series 6!

Do you know how your exams went, Rich? In any case, good luck.

I got into Science/Commerce at the University of Western Australia (need a final score in the top 8.5% of the state to get in, so Im bloody happy ). Do you know what you were aiming to do after high school, or are you as undecided as I was?

Im doing Science/Commerce because its exactly what I did at school- if I chose them then, Ill choose them again now. Im interested in becoming a Rocket Scientist () so my course will set me up for that well.

Anyway, good luck!

[velociraptor]

Velociraptors Fanfic Tournament - Series 6!

I think my exams went OK, Tom, but Ill need to wait until March to find out my results. Ill also be going into university after college, to study Zoology.

Good luck with your course, Tom!