Team Eventorizon: Build Diary

[Eventorizon]

Quick question, I have just got my hands on a 1.2m square, 1.2mm thick sheet of Ti10 from uni biut Ti10 is coming up blank in all my google searches. There is a load of stuff stamped across it repeatedly but Its not with me atm but I will find out what it says!
So can someone tell me what Ti 10 is?

EDIT: Got my answer its grade 5 titanium, but an obscure aero grade.

[Eventorizon]

What do people think... on Conker 3 should I drop the 4WD in order to optimise the weapon or keep it cos that's the style of the machine? Conker 1 & 2 had all the weight in the wrong place. If I drop the 4WD then I could take the drisk up to 4 or even 4.5kg but then I might as well be building a drum bot like 720. As cool as C3 looks at the moment its still not optimised for combat unlike Binky or NST or 720. Thoughts?

[plargen]

would you be able to save weight by dropping 2 motors and use pulleys to drive the other 2 wheels then you could make it more compact

[Ellis]

You can have both worlds. I'd say certainly drop the 4 motors. It's not necessary unless your primary purpose is to push. Cobalt was the perfect example of 2 motors and 2 wheels outdoing the competition, though, and that was down to good design. If the wheels are "in the middle" of the machine, à la Cobalt, I imagine you can also sort of fake the steadiness of 4WD through ESCs with breaking and/or a gyro. I can see that being worth pursuing if you still want to be ahead of most competition in terms of drive.

[RogueTwoRobots]

Sorry to rip a hole in your example Ellis, but Cobalt was 4WD

EDIT: Just to add to the discussion, 2WD gives a touch more manoeuverability, which can be highly advantageous for spinners. Unless you want to have a solid back-up should the spinning weapon fail, 4WD is usually unnecessary.

[Eventorizon]

C3 has 2 of the most powerful Banebots motors for drive and gets 4WD by running belts to the front (I should put a picture up)... hang on...

c3___3_3_5__featherweight_fighting_robot__by_eventorizon_ajsb-d5z0izd.pdf

What will change is the motor in the pic is a HK50 but its going down to a HK 40, and the top panel is 1.2mm Ti 5 not polycarb as in the pic.

Drive is 2x P60 4:1 Gearboxes with RS775 18V motors running of a 6S 2.65 AH lipo, weapon is a 3.5kg drum off a HK 4035 800kv running on 10S through a Scorpion commander 50V

[Ellis]

Sorry to rip a hole in your example Ellis, but Cobalt was 4WD

EDIT: Just to add to the discussion, 2WD gives a touch more manoeuverability, which can be highly advantageous for spinners. Unless you want to have a solid back-up should the spinning weapon fail, 4WD is usually unnecessary.

?!

Wasn't Cobalt at last year's champs 2WD?

My life is a lie! I thought it ran orange banebots wheels in the very middle of the robot for '12. I swear I saw that setup in a build thread somewhere. Or was that Diablo, then?

Oh well, forget me, lol.

Also, Alex, do you mean the 4:1 gearboxes? 4:1 drive is unlikely to work, is it? Must have a ridiculous theoretical top speed. I'd think their 16:1 is about perfect.

[Max]

Shame your not going for a polycarbonate top, it looks cool being able to see inside!
I don't get why you have the wedge on the front, surely it would be easier to hit people and you could get a better engagement without it so you just drove straight into them? Obviously you would have to move the disk slightly further foward.
From the bit of video footage of drumroll an binky (they both had wedges didn't they?) at the GSL, the wedges looked more like a hindrance?

[RogueTwoRobots]

Yeah, Diablo was 2WD with the wheels in the centre, although I don't think it was set up like that until after the champs when Dave bought it.

Drumroll ran with a wedge at this year's champs, yes. For the most part, I found it to be very beneficial and helped to feed the robots up into the drum. All worked well until I fought Galactus and he got a head-on smash on the wedge and bent it up into the drum, jamming it.

I won't be remaking the wedge though, mainly because I'll be fabricating a new drum with a slightly larger diameter to take the teeth closer to the floor (something I couldn't do with the current drum without butchering the chassis). However I still like the wedge and might re-adopt it for a whiteboard spinner machine.

[Eventorizon]

Alex, do you mean the 4:1 gearboxes? 4:1 drive is unlikely to work, is it? Must have a ridiculous theoretical top speed. I'd think their 16:1 is about perfect.

I think it maxs out at about 16mph in theory... cant remember exactly and I have lost the speed calculator I made in this debarcle with my laptop.

Shame your not going for a polycarbonate top, it looks cool being able to see inside!
I don't get why you have the wedge on the front, surely it would be easier to hit people and you could get a better engagement without it

Quite right. Thats why I am asking. I would need to have it on against say NST and LS4 but I would probably remove it for any ither fight and add more armour or mess with some other aspect

[grant_ploughbot]

Anything geared over 10mph for a feather is going to be too quick to control. I would go for a higher ratio if you can and your motors are illy to thank you for it!

[Eventorizon]

Anything geared over 10mph for a feather is going to be too quick to control. I would go for a higher ratio if you can and your motors are illy to thank you for it!

Ok Grant, I will change it down to 16:1 then, should be more than fast enough then and have more torque!

[grant_ploughbot]

Excellent, I'm just looking at gearing my Astro motors down to around 16:1 on my new robot. I used to run at 15:1 but that was still very quick, and I might need some magnets in it will help with the torque to keep current draw low

[PJ-27]

Assuming you're using 100mm wheels and the drill motor spins at 18,000 rpm 4:1 gives a top speed of 52.7 mph!

http://www.technobotsonline.com/robo...alculator.html

16:1 gives 13.2mph, plus you have loses, wheel spin etc... so 16:1 seems a sane setup.

[Ellis]

That was what I was thinking! Fairly sure he'll be using 73mm, but even so, it couldn't have been short of ridiculous on 4:1. 16:1 with the 775 motors will make for a solid drivetrain.