New FW- doorstop

[maddox10]

Re: New FW- doorstop

That's yet another combination. The windings from a 900, and the axle of the fast-runner.

Oh well, that changes the entire calculation.

37 km/h tops. Perfectly useable. But I won't tape off the fan of the motor.

[Danjr1]

Re: New FW- doorstop

I think the trade off is going to be weaker motors for stronger armour, whereas at the moment it's strong and fast drive for slightly weaker armour

[maddox10]

Re: New FW- doorstop

BonX uses 2 Speed 900 with 10-1 gearratio, Sidewinder speedo, and aboutish 24V in batteries.

Armor is 3.2mm Hardox all over, with internal bracing.

[Danjr1]

Re: New FW- doorstop

The four drill motors would be the gimson 18v versions, ran at 22.2v. From my guesstimates, the four drill motors would generally be slower but have much greater torque through their 36:1 gearbox, but again the replica speed 900s will have the opposite (faster drive, lower torque). Both systems would use two botbitz 85a controllers.

[Danjr1]

Re: New FW- doorstop

Had a new frame made up. 5mm thick sides and 3mm lids. all welded steel. 4wd drive with four 18v drill motors. ran at 22.2v through two botbitz 85a ESCs. Going to change the ratio in the gearboxes to 24:1 to get a little more speed. The wheel arches will glow red in the same way my old bot glowed green. Will probably end up selling the old HDPE speed 900 replica bot at some point.

[shakesc]

Re: New FW- doorstop

Interesting, what weight is the bot currently?

[Danjr1]

Re: New FW- doorstop

12kg without lipo and electronics. Should easily be in weight

[Danjr1]

Re: New FW- doorstop

Should make for an interesting wire up!

[Anttazz]

Re: New FW- doorstop

Would be good if you met my cousin with Cicatrix, the machines are so similar it'd be good to see how they both got on against each other

[Danjr1]

Re: New FW- doorstop

That would be cool. If not, could just have a whiteboard battle.

[Danjr1]

Re: New FW- doorstop

The drive units have failed (totally!). I'm looking at the gimson GR2 units. Other than the expected work to make them fit, will they fit in the same space as an Argos unit with a robochallenge 75mm wheel? It's the length I'm concerned about as my bot is very compact (see the pic earlier in this post).

Cheers
Dan

[Bodge Job]

Re: New FW- doorstop

yes their shorter

[Ellis]

Re: New FW- doorstop

How have the drives failed? We have just bought a bunch of innards to make our drills 24:1...

Did the pins that hold the gears on the second stage (the 6:1 bit as against to the Gimson first stage which is 4:1) fall out/come loose?

If yes, that's a good thing (for me anyway, that's how all of our drills have failed to date), if you stripped the first stage of gears, that worries me, we just spent 65 quid on parts!

[Danjr1]

Re: New FW- doorstop

Yeah, the pins came loose. Put it all back together but didn't work, could hear it grinding when you turned the wheel. Did get a good amount of use out of them though. Will contact gimson robotics on Monday to get hold of all the parts I need.

Got a bit of an issue with the control as well but Mario helped me out with that. I think the thermal protection on the escs was kicking in as all the motors and ESCs were completely sealed. This then lead to the drive dying about 2 mins into the fight then being fine 5 mins later!

[Ellis]

Re: New FW- doorstop

Ah, okay. We should be able to avoid that as we're also going to be running 18v motors, but at 5s. I don't see why they should fail, the setup will be running more or less within factory spec. It can only be better than our current setup where we blow something up in every fight!

And yes, I think the max rating for the tz85s is 24v so you're probably just nudging their limits after a few minutes of battle. I saw some of the footage and it certainly was running fast!

Also Ewan may be able to advise better, but if you intend to run 18v Gimsons on 6s then you're likely to run into this problem again. The pin setup is the same as that in the average drill, so the failures may well happen in the same way unless the load is dropped by upping motor v or lowering the battery v.

Keep us posted.