Team Eventorizon: Build Diary

[MikeNCR]

The US guys harden to RC 50 to 54 and that gives it even more toughness.

To add to that bit, on my old bar spinner Moros I had a 3" x 3/8" x 28" S7 bar spun by a short mag through a 2:1 right angle box. Besides a bit of mushrooming at the tip, I never had a problem with the bar failing.

A few videos:
https://www.youtube.com/watch?v=BO8XSH21tzU
https://www.youtube.com/watch?v=SK1zZOtwIuk
https://www.youtube.com/watch?v=HoHERDQgZwo

[overkill]

Great videos Mike! Are they from Motorama? I am seriously thinking about going next year.

[harry hills]

Love the overhead and same about wanting to go to Motorama!

[MikeNCR]

Yeah, those are from Motorama.

[Eventorizon]

Nick is right. We want to shape the disc after it has been cut so using Hardox is out as you can't machine it.

It also seems that S7 is hard to come by in the UK. We have contacted around 8 different suppliers and only 1 said they could source it if we needed it where as most can get H13. That said we only need it once and we have almost a whole year to get it done.

That is a good point about the hardening. I suspect most companies in the UK will know how to treat H13 and not S7 even if they are very similar.

And Motorama is on my list too. I was eye balling Moros as the coire design of Binky at one point.

[overkill]

There is a Euro equivalent to S7 named W-nr 1.2357. I also found some alternate names that might be used in Europe: ASTM A597, ASTM A681, UNS T41907

[Eventorizon]

Ah yes, that long numbered one. My dad found that the other day but we couldn't find a datasheet on it.

[maddox10]

Hardox can be machined. The 450 I can do in my own workshop. Not friendly for the tools, and HSS cutters are for the garbagecan after the work.

The 650 can be machined with high end machines and cutters, and if that ain't good enough, spark erosion is another option.

And, if the design doesn't fit the materiaal, redesign is fairly cheap.

[Ellis]

You could get the KE back with a hardox disc quite easily. You get say 12mm thick 650 cut to form the main disc, spokes, and teeth, with a bolt pattern around the rim, and then ~5mm steel of any kind, and put a circle of it around the outside on either side, bolted on. The result is a strong, cheapish disc with massive KE and a plenty tough enough tooth. I will likely experiment with that sort of thing, maybe for next year.

[Mouldy]

540's beater was waterjet from 25mm hardox... the edges did taper slightly but still good enough for a robot... im told some waterjet companies have a pivoting jet to compensate for the taper if your bothered.

[maddox10]

Correct, the firm I work with for laser and watercutting has a 2.5D watercutter, meaning they can cut angled sides.

Main point, it's a straight cut.
Main disadvantage, the machine is booked solid, so it's premium £££ to get stuf cut on it.

[Eventorizon]

I have managed to get the Castle Link software working so I have uploaded Conker 3's data for you all to examine.

The different switch ons are as follows

1: Direction Test (Low voltage)
2: Interrupted spin up (No spin up)
3: Test Video
4: Tech-Check
5: Flow & Kaizer
6: Massacre and Drumroll
7: Galactus & Nightfury
8: 720

I have just uploaded the interesting ones (IMO): Current, Temperature and RPM at the output.

The key points though are...

Maximum Current: 254.7A
(The average given is useless because of all the stops and starts, unless it ignores those)

Conker 3 Post GSL 2014 Current Graph 01.jpg

Maxiumum Speed: 11'096 RPM (Oh yeah!)
(It seems to happy sit up in the 10K range when its not hitting anything. You can see where the big hits happened where the RPM dives)

Conker 3 Post GSL 2014 RPM Graph 01.jpg

Maximum ESC Temp: 55.6 Degrees C
(Not overly interesting but just surprising considering that it was sat next to 3 straining batteries in a metal box!

Conker 3 Post GSL 2014 Temperature Graph 01.jpg

[Eventorizon]

Going to have some time on my hands for a while so I thought I would get one of our pneumatic machines up and running.

One part I got my hands on was a dud 1Kg Powder fire extinguisher like this one: http://www.safelincs.co.uk/shopimage...r-warranty.jpg

2013-06-03 15.22.00.jpg

I was planning to use it as a buffer tank on a LP system, 10 Bar Max. The dial on the extinguisher runs from 10Bar to 12Bar in the green and up to 16Bar where it goes red again. I reckon it will be safe to use as a buffer since I will be operating under its normal storage pressure of 12Bar and quite a way under the dangerous 16 bar limit but experienced minds many know better.

This will be powered by a 12Oz Paintball bottle and run to a small 40mm Bore, 75mm Stroke ram.

2013-05-26 20.59.40.jpg

No idea what shape the robot will be yet but since the axe bot is proving difficult to pack how I like I will try something a little easier first without the fiddly gear mechanism.

[Revsmin]

I'm assuming it's a feather by the size 9f the ram, in which case that fire extinguisher is going to be a bit too big, too heavy for use, it would weigh close to 3.5kg. For comparison Flow's bottle weighs just 600g empty and 1.2kg filled. I'd suggest to just use a paintball bottle and regulator setup, much simpler and lighter. If you don't want to get into fiddly gearing, I'd imagine it'll be a LP flipper?

[Eventorizon]

Managed to find all the parts.

2014-05-18 09.57.52.jpg

I got the size wrong is a 1kg powder extinguisher and it weighs 250g as it stands with nothing attached.

I am not sure what kind of flow controller I have, but I do need to change the solenoid as it is 230V AC at the moment.

Also discovered I have 2 brand new and unused GR01's. Not a bad find.

One possible layout...

2014-05-18 10.04.23.jpg