Velociraptor's Fanfic Tournament - Series 6!

[andrewj]

Psyclone (17) vs Seggy The Third

I€™m going to keep the spinner on low power through the majority of the match, so that I can cause some damage but also I wont get shocked out or bounced around a lot. Hopefully with this tactic I can cause some damage and stay safe. If I€™m running behind towards the end of the match I€™ll crank up to full power and do some smashing.
Sorry about the chassis thing. But maybe if there were some rules stating I would need to include a chassis, thing would be clearer. Just an idea€¦ :wink:

(This isn€™t aimed at Richard by the way, I mean generally for all of us. The rules for stats the previous council decided on were very basic and poor IMO)

*End Rant*

WX 6.0 (2) vs The Ultimate Wedge

I don€™t know what the difference in power is between the LEM130€™s and LEM200€™s but I presume it€™s quite a bit. The only thing I can think of doing it so put the scoop on and the skirts on the other sides. The skirts should hopefully prevent The Ultimate Wedge getting under so it cannot ram or flip. I€™ll use the scoop hoping it will give me the heavier front end and therefore a better chance of getting under if it€™s a head to head ram.

Well, looks like my two robots are going to be going out at this stage. A great series so far Mr. S and I hope there will be another series in the future!

[pcbore]

If you felt that way Andy, maybe you could have suggested the chasis thing? Anyway, theres no rule against adding more info than the writer wants, is there.

[andrewj]

Not really, if I thought it was needed I would have included it.

[pcbore]

Considering your shape, you pretty much have to stick everything to the base anyways. You could stick a chasis in, but it would still be attached to the base and not much else, so its a waste of weight really.

[andrewj]

If there was one I guess it would just be support for the shell. Anyway, chassis or not Im gonna lose. :P

[pcbore]

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

[mrdaves]

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]

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]

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]

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.