360 - mini hypnodisc

[Mouldy]

Re: 360 - mini hypnodisc

got a few box's, save me a big pit table! lol

just took the data off the logging system in the esc from the spinup in the video... came up like this;



charged the lipo and did another test...



spins up to 7812rpm in 1 second and pulls less then 60a that's gotta be a record?

[PJ-27]

Re: 360 - mini hypnodisc

That's crazy!

How much does the beater weigh?

[Mouldy]

Re: 360 - mini hypnodisc

2kg ...shame its not more.

[Mouldy]

Re: 360 - mini hypnodisc

material fail;



i think what i got sold as D2.... wasnt D2

this is how it did before it broke;

http://www.youtube.com/watch?v=YKZI1seh3t4

broke hitting ploughbots old steel shell....

http://www.youtube.com/watch?v=dZ7TSSFNajY

think ill make a new one from a plate of hardox... as its got more flex in it... ill sort it after the speed 900 stuff is in though...

[PJ-27]

Re: 360 - mini hypnodisc

Were the arms welded on, or has it just sheared straight through the metal? You'd think it would be up to more than that.

[cliveb]

Re: 360 - mini hypnodisc

I so want to fight it

[RogueTwoRobots]

Re: 360 - mini hypnodisc

Damn, that's crap :shock:
Barely looks like solid steel at the point where's it's broken; looks more like some sort of cheap composite. Hope it didn't rob you of too much cash.

But before that happened it was looking strong. May only weigh 2kg but with the power behind it, that's enough. Best of luck getting a new one sorted.

[Mouldy]

Re: 360 - mini hypnodisc

PJ- Yeah solid material... pretty lame how it sheered like that.

Clive- you'll get your chance to get beaten like everyone else lol

Jamie... yeah seemed ok... ill be speeding it up to 11000RPM instead of 7800rpm i think for version 2.... also think ill make the teeth slightly more serated for a better bite... just doing the cad now

[typhoon_driver]

Re: 360 - mini hypnodisc

looks like a shear that you would expect from a stress concentration on a very hard metal. The metal is probably the grade of tool steel you were after. Had their been a larger radius to the shaft it may not have broken although it's a good demonstration as to why the hardest material isn't always the best.

[Mouldy]

Re: 360 - mini hypnodisc

not a lot of load for 17mm tool steel... also its hard to machine a radius when your turnin a square bar round.

[grant_ploughbot]

Re: 360 - mini hypnodisc

As we were saying it's pretty certain it's not a nice new peice of D2 that dave got sent as it should have been.
It almost looks very work hardened as if its a cheap tool steel thats been cut off the end of a used press tool or something thats done a few hundred thousand cycles lol. D2 is an excellent material - that beater isnt.

[PJ-27]

Re: 360 - mini hypnodisc

Maybe we're looking at this the wrong way, and actually PloughBots steel shell is just super awesome!

[Mouldy]

Re: 360 - mini hypnodisc

Dennis has done his bit on the gearbox's... hopefully ill have them in the next day or two, then i can make new output shafts for the main drive, and get them mounted in the robot... then it wont be as borring as it was at kidderminster.

[Mouldy]

Re: 360 - mini hypnodisc

she lives!

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

[Laser]

Re: 360 - mini hypnodisc

looking really good Dave, whats the gear ratio on the speed 900's?