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Bot will be a horizontal ring spinner with 2wd (4wd weight permitting)

Pick up the shell tomorrow... 2 of them actually.

First is 400mm x 85mm x 6mm (Spinner shell) weight should be 6kg
Second is 400mm x 85mm x 5mm weight 5kg

Both are pressed every 3-5mm as Im told its not possible to roll any type of ring out of hardox 450 beyond 3.2mm unless the ring is 1200mm+
lol..

Unless you have a LOT of money to throw around I would probably not recommend this method to anybody... its been quite expensive and time consuming... The hardox is pretty cheap, its the labour to get it into a ring that was expensive.. Though the job is quite good, they mentioned its not a job they will do again.. It actually caused a blowout on the hydraulic hose they had on the press..




Should have it all together by the 23rd.. May be using Glens IBC for the moment (as he has kindly offered to loan it)

Have pretty much everything figured out, just got to put it all together!

Glen you fanny bandit Im going to KILL you!!!

You can see the base here... thinking about it i didnt really take into account the thickness of the plate... I may have to actually make a frame...

the total height is 85mm, but with the base plate installed its back down to 79mm... will have to maybe countersink things..

Who has a mill?

Today I got the wheels.. Bought a few spare actually... You never know right?

The blue ones are similar to the coulsons but a bit more grippier on steel.
The black omni wheels are the rubber ones, the grey omnis are the poly ones...

The black ones have a hell of a lot of grip, the blue are pretty good too.. So now I need to have a think about the wheel config..

I could go omnidirectional... Ive got 4 of those motor/gearbox combos... all I'd need then is a omni mixer..

Beginning to doubt this is going to be ready by the 23rd..

Decisions decisions...

Looking nucking futs dude!
You just got a ring rolled from what I use for my weapon blades...!
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YEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAH

Nice job, it must have taken them hours to do that in a hydraulic press! Is it going to be a full-on ring spinner or a shell? It looks more like a shell spinner in the photos...

Have you picked out a motor to drive the shell yet? A 5 or 6 kg shell will need a fairly serious amount of power, plus if you are doing a ring spinner, there will be more friction to overcome.
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UK 2016 Gladiator champion

hey nick, thats one of the problems I currently have...

I don't have a lot of height and you are right, powering it is the current problem... I was looking at 2x fan motors as according to angus there are shorter versions of them. Its a bit of a worry, I've been thinking of a mag motor and a gearbox too. Any suggestions?

Its going to be a ring spinner (just the outer ring spinning) and you are right about the time it took to make lol..

Brush-Less? Is it going to be friction driven?
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Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
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No.. I'd prefer brushed...

With a hight of 79mm, a Magmotor would *just* fit, but I can't see a gearbox and a friction drive wheel fitting. There is an ultra-thin fan motor that would definitely fit, except it is quite wide and you would need to put on a rather large drive wheel - what is the diameter of the shell?
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Australian 2015 Featherweight champion
UK 2016 Gladiator champion

390mm..

But i looked at that ultra thin motor but it doesnt have anywhere near enough power..

I was thinking of 2 or 3 of them, but they probably wouldn't fit in a 390mm diameter. Your best bet is probably a brushless motor or two, Mounting them like Glen has to protect them from shock and using higher speed motors with heaps of gear reduction to prevent the start-up problems that some bots have had recently.

The problem with using a brushed motor is that you are limited to pancake designs with the limited hight of the ring - I don't think you will find anything useful. The other possibility is to weld a flange inside the top of the ring and use a horizontally mounted motor and a friction drive wheel against the flange. A pair of Dewalt 18V drill motors might be a good choice for that layout.
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Australian 2015 Featherweight champion
UK 2016 Gladiator champion

Well thats another option... it doesnt take much to mount the motors horizontally, but while the dewalts have the power they arent big on the speed. I may actually have to look at a mag motor or something?

Maybe you could look into a mini ev or two with friction drive. The mini ev's are a cheap way of doing it and still pack a fair bit of punch.
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lol, Im listening

A mini EV? Ive seen the Ev warrior but whats a mini ev?


thanks!

http://www.robotmarketplace.com/products/0-MMEV.html

Cheap, and they work. You could blow up 60 of them and still be half the price of a magmotor
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The Mini EVs are cheap, but the RMP mentions that stocks are limited and they are not being replaced. They are also much lower power than a DeWalt, or a fan motor for that matter.

I'm not sure I understand the comment about Dewalts not being big on speed - they have a no-load speed of 22K, while the Mags have a 6K rpm. If you mount the motors horizontally and use a flange a the driven surface, you can have a small diameter drive wheel and achieve a huge reduction ratio IE a 20mm friction wheel would be about 20:380 or 1:19 reduction ( I picked 380mm as the middle of the flange, it might be different). The motors will never reach their no load speed but might do around 18K, so a 20mm drive wheel would reduce the ring speed to under 1,000 rpm. going on that, I think 30mm drive wheels on a pair of Dewalts would be a great starting point. You could go a bit bigger on the drive wheel for more speed, but that also means more stress on the motors and ring mounts.

If you used a mag motor, the biggest drive wheel you can use is around 70mm giving a reduction of around 1:5.4. you would get about 5K rpm from the Mag, giving a ring speed under 1K rpm. You won't get more speed than that without a larger drive wheel or a smaller diameter ring.
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Australian 2015 Featherweight champion
UK 2016 Gladiator champion