360 - mini hypnodisc

[Gabe01]

Re: 360 - mini hypnodisc

I can't wait to see it drive, just to check out how the drum effects it. I must say that it's beautiful in its simplistic form. Will you be leaving the wheels unprotected? Could you give us some dimensions

[PJ-27]

Re: 360 - mini hypnodisc

280a!!!

What battery are you using? How do you fuse for that!?

[Mouldy]

Re: 360 - mini hypnodisc

Wheels will be protected, will have a Hardox ring around it when finnished.

Pj- I have a 100a auto fuse inline with the lipo, to blow that it'd prob take around 250a for 4 seconds at a guess... My lipo is a 5000mah thunder power 45/90c 5s... Meaning it can handle 225a continuous current draw, and upto 450a burst

Once I've sorted out the belt tension and changed the frequency the motor runs at in the software I should be able to get the spin up current below the 250a mark at a guess. Sounds a lot, but that's me hammering the throttle for a fast spin up.... Could possibly get it below 200a if I wanted.

[Mouldy]

Re: 360 - mini hypnodisc

Thats better;



spins up to 12,912 RPM and draws 216amp.... was taking it a bit easier on the throttle... but i think the spin up is good enough now.

Think its the fastest spinning weapon on a featherweight in the UK so far now .. if anyone knows the weight/OD/RPM Of touro feather in the US id like to know... as thats the kinda effect i was aiming for.

[PJ-27]

Re: 360 - mini hypnodisc

Only 12,912 rpm?!.......

What weight and OD are you running?

[Mouldy]

Re: 360 - mini hypnodisc

the drums 3kg, 95OD x 220mm wide

[PJ-27]

Re: 360 - mini hypnodisc

That's going to pack a serious punch!

[razerdave]

Re: 360 - mini hypnodisc

That's going to pack a serious punch!

If it can engage anything...

I mean no disrespect to Dave at all by that remark (he can build darn better machines than me ) but those teeth look far too small to make any meaningful engagement on another robot. I could well be wrong, but it just appears that way.

[PJ-27]

Re: 360 - mini hypnodisc

Oh yeh, at that RPM there will be lots of grinding (I don't think size of teeth matters much at this sort of speed) and that much kinetic force it'll be a pain to drive, but when it does engage!

[RogueTwoRobots]

Re: 360 - mini hypnodisc

I dunno, I reckon the depth of those teeth will be fine. We'd naturally assume that the bigger the teeth, the better the engagement. But to compare, Drumroll II has quite big teeth and Galactus/Touro Feather have quite shallow teeth (like Dave's machine). I can get some good hits with mine, but Galactus was getting fantastic hits too, and if you check out some of the Touro vids, their opponents are getting serious airtime!
The top-end rpm might be a bit high but it's easy enough to drop that down if necessary. Either way, it's gonna hit hard.

[typhoon_driver]

Re: 360 - mini hypnodisc

It doesn't need large teeth with such a high rpm as even at full forward speed you are only going to get a mm tops engagement (can't be bothered doing the sum atm)

[Mouldy]

Re: 360 - mini hypnodisc

theres a reason for the small teeth Dave-

If you look at most drum robots with similar drums, the teeth tend to rip out of the keyways....my teeth go twice as deep into the drum as they protrude... giving it strength.

Also, if you look at the tips on a disc robot like 360... the teeth are 30mm on that... but only the last 5mm of that actually have any damage to them.

I reckon it'll be ok... might spin it up and drive it into diablo to see what happens when i get chance.

[MikeNCR]

Re: 360 - mini hypnodisc

It should be plenty. You're spinning the drum at 215.2 revolutions per second, which means with two teeth, the potential for an impact every 1/430.4 or 0.0023 seconds. Even at a combined approach speed of 10m/s, you're getting 2.3cm of bite in absolutely optimal conditions.

[Mouldy]

Re: 360 - mini hypnodisc

Yeah drivings gonna be hard.... not even 1/4 throttle;

http://www.youtube.com/watch?v=E3AO3Arbo6s

[SamO]

Re: 360 - mini hypnodisc

That seems um... safe! :shock:
Like to see it at full speed