Team Eventorizon: Build Diary

[RogueTwoRobots]

I'm slightly disturbed that The Riddler's been at a couple of your wheels...

[grant_ploughbot]

I'm guessing those are the ones that melted too much from the Laser? What sort of power did you need to cut through that plastic hub?

[Eventorizon]

Why So many wheels? Spares?

Two order mess ups on my part

I'm slightly disturbed that The Riddler's been at a couple of your wheels...

Those 2 wheels are not perfectly modified. One is at a slight angle but still centred and the other is about 1mm loose.

I'm guessing those are the ones that melted too much from the Laser? What sort of power did you need to cut through that plastic hub?

I did 6 perfectly, 2 were slightly off. The uni has a 120W Laser cutter but as the material would simply melt back together if we did it in one pass I put so it would cut at 5x the speed and thus a 5th of the depth. Re just repeated the cycle until we cut all the way through. We have to turn them over as well which is tricky as the focus of the laser goes out the deeper we cut.

I am going to be modifying the rest tomorrow. So if anyone wants any unmodified ones they better say now.

[Eventorizon]

Armour Question.

Binky has the same 2mm Grade 2 Titanium that Conker 2 had. After what happened in Conker's fight against LS4 I am concerned that Binky's armour is just a massive accident waiting to happen.

We got hold of some 1.2mm Grade 5 Titanium, enough to redo the armour maybe 3 times. But I don't think its enough. Is simply doubling up the armour a good idea or should we source some thicker Ti To go round the bottom edge (Say 3mm G5)

We were planning to add a rim to the edge of the Ti base to bolt the armour to like LH3 to stiffen the whole machine up after LF3 broke our welds by tossing us through the air!

[typhoon_driver]

Thicker is always better and single piece over layered. Put some 8mm HDPE on the outside of the ti and it will absorb a lot of the impacts.

[Eventorizon]

Finally had a little time to assemble my Banebots motors.
2013-06-28 13.35.31.jpg
Oddly I came across 2 problems.
In one motor the plastic fan is not perpedicular to the shaft so it feeps rubbing on the magnets but I am sure that will wear in with time. (I have tried moving it with a screw driver and it hasn't made a difference.)
The other issues is that one of the gearbox's was supplied with the wrong MOD gear for the gearbox's I am using, so I will have to get on to BB and discuss that.

[Eventorizon]

Hardox for the Weapon and armour arrived while I was away. 4mm Hardox 500 for the armour and 20mm Hardox 500 for the weapon. Still on the list is a sheet of 3mm Titanium (Grade 5 or above), 20mm Aluminium for the bulkheads and weapon mount (2014, 7075 or Alumec) and then various diameters of Titanium bar for supports and shafts.

[Eventorizon]

Made some progress today now that I have an income.

Ordered all my RS parts today totalling around £130. Thats all the belts, pulleys and bearings for the drive and weapon.

Also bought a sheet of 0.140 inch (3.556mm) Grade 5 Titanium off ebay. Annoying its coming from Israel so that will be £76 including import tax.

This goes alongside the Hardox, the ESC's drive motors, wheels, hubs, batteries, and receiver.

All that is missing is the Aluminium for the Bulkheads, the Weapon motor and the weapon ESC!

And I am now onto version 3.14.2. 200mm wide weapon, 25% more force than 720 (In theory) and 13kg in CAD.

[Andy]

All sounds brilliant goodluck with the build

[Eventorizon]

Got quite a few interesting bits of news...

Firstly David W is selling us Hells Angel which will give us a chance to have our first look at pneumatics. Spinners are all well and good but in the end they are just a big motor and a lump of metal so it will be fun to get on with something a little trickier.

The current plan is to re purpose the chassis, reconfigure the internal layout to make it smaller (David has said this is possible) and then build a nice new chassis with some better armour. This machine wont be for competitions but give us something that is interesting for audiences to watch at live events and heavyweight meets.

Secondly we have taken a stock check of everything we have... and it is a lot. We have enough electronics to build 2 whole machines so we will be building a second whiteboard machine, either pneumatic or with a linear actuator, so that we can both rumble at the heavyweight events.

Thirdly, as beetles are definitely on the up I have concepted not only a few beetle machines but a beetle arena...

Beetle Arena 01.jpg Beetle Bar Spinner.jpg

[Conker 2 & 3 are in there for scale along with the beetle concept]

The arena is around 400kg when built and is 2m x 2m x 1m with 10mm Polycarbonate on every side and a 4mm thick steel floor. Finally there is a 200mm tall 4mm thick kickboard round the edge and a door at either side of the arena. The arena would actually serve as both a Beetle arena but also as a featherweight testing and demonstration area. In the same way you can demo/test a single heavyweight in the RoboChallange arena you could demo/test a single feather in the Beetle arena. There are currently no rules about this and I feel that it is something that aught to be talked about and decided upon.

As for the beetle machine we are going with the 1.5kg limit to match Iron Conkers so this machine has a 3mm Grade 5 Ti base, 1.2mm Grade 5 armour and is fitted with a 100g bar. Doesn't sound much but inside are 3 3S 1000mAh lipos. Two in series, giving 22.2V, power a HK-2520-1360Kv brushless motor which directly drives the bar. So, in theory, the bar will do 30'000 RPM. I doubt that we would ever go anywhere near that, mainly because of engagement, but its nice to know its possible.