2012 FRA UK Featherweight Championships by RoboChallenge

[Leonardomayo]

Re: 2012 FRA UK Featherweight Championships by RoboChallenge

anyone reading lower than 8.3kg ??

8kg exactly according to my scales. Oh the joys of wooden robots.

[RogueTwoRobots]

Re: 2012 FRA UK Featherweight Championships by RoboChallenge

Custom made 5mm steel wedge and two machined HDPE wheels

Okay, not many of us will have them lying around in our spares box :P

But looking at the last picture of Doorstop that you posted, could you not just put some tyre tread round your wheels and some more HDPE at the front (on the vertical bulkhead, rather than in the shape of a wedge) to absorb the majority of impacts?

[mattsdragons]

Re: 2012 FRA UK Featherweight Championships by RoboChallenge

Im sure you could get doorstop working, maybe not quite in the way you intended but should be fine

[graeme]

Re: 2012 FRA UK Featherweight Championships by RoboChallenge

Yes its a 26KW solenoid, in theory it wont be as good as the co2 system but havent tested it yet
with the flipper arm on and dont know how long it will last.

[PJ-27]

Re: 2012 FRA UK Featherweight Championships by RoboChallenge

A while back I was looking into Solenoid alternatives to CO2 but ran into problems with stroke length being too short and the fact that the solenoid loses power as the arm extends further.
What sort of Nm rating has it got? I found I needed something like 2000Nm to contend with a FP flipper system.

[RogueTwoRobots]

Re: 2012 FRA UK Featherweight Championships by RoboChallenge

ran into problems with stroke length being too short

Story of your life?

[Revsmin]

Re: 2012 FRA UK Featherweight Championships by RoboChallenge

I know this is short notice, but the new 12v NiMH charger I bought will only charge up to 2.8v.
I was wondering if anyone (probably best if competing on saturday) could lend me a 12v NiMH charger with a tamiya connector for the day? It would be really helpful, much appreciated.

[razerdave]

Re: 2012 FRA UK Featherweight Championships by RoboChallenge

I'll bring my pro peak for you to use. Which type of tamiya connector are you using, male or female?

[Revsmin]

Re: 2012 FRA UK Featherweight Championships by RoboChallenge

Male on the battery. Thanks Dave!

[graeme]

Re: 2012 FRA UK Featherweight Championships by RoboChallenge

Just tested the flipper, it self rights ok, might flip another robot out if its right at the edge of the arena
The stroke is only 38mm and the force should start at 180kg rising to 300kg at the end of the stroke with this design assuming that the lipos can supply it with 500a, may need to test different lipos at some point and increase the wire size and bigger connectors(they were warm after 15 flips).

[teamshock]

Re: 2012 FRA UK Featherweight Championships by RoboChallenge

Just been to the greengrocers to use their scales to weigh Inertia as they are the most accurate ones we can find here is the result





Not bad since this is with our heaviest Ni-Mh pack fitted

[RogueTwoRobots]

Re: 2012 FRA UK Featherweight Championships by RoboChallenge

Very nice Will, can't get much closer than that!
Car's packed, we'll be leaving shortly (once I've had some lunch). Good luck to anyone who is still building, and of course good luck to everyone competing. See you all there!

Viva la drums!

[mattsdragons]

Re: 2012 FRA UK Featherweight Championships by RoboChallenge

14.2kg right now, but it was 14.4 when I first weighed it so its going down

[PJ-27]

Re: 2012 FRA UK Featherweight Championships by RoboChallenge

Having some RC issues, hoping someone can advise.

Our £2 V-Tail mixer (the ones that just say v-tail mixer on them) ruins our fail safing. The ESC that has the BEC just refuses to failsafe with the mixer in line. Using Electronize 15a.

Any ideas?

Alternatively we tried the Mixing built into our DX5E, which aside from the half throws is set up so that up and down on the stick is left and right, and left and right is forward and back.

Any one know how to swap this?

[razerdave]

Re: 2012 FRA UK Featherweight Championships by RoboChallenge

Swap the channels or swap 1 motors polarity. If up and down on the stick goes side to side in the robot, one motor is going forward on command, the other is not. Swap that motors wires over.

As for the failsafe, can't offer any insight on that one .