Pulverizer Build Diary

[typhoon_driver]

Re: Pulverizer Build Diary

first thing is first, ask yourself how fast you want the robot to spin. From that work out what rpm you will need from a motor at a given wheel size. My big worry with the melty brain was that to get a decent speed I basically needed either a 1:1 or a 2:1 ratio after doing the sums. That meant a motor with a lot of torque. You also need to look at what you plan on powering the batteries with. Ideally lipo at 10s or similar.

With regards to the one wheel/two wheel arguement, well you could use a more powerful motor. You would have more difficulty in balancing the chassis overall for a balanced spin.

You also have to look at the size of mosfet you are planning on using for the on/off circuit. I'm going to assume you are using the open source material that I used for my play around.

The ampflow motors are good but I would recommend looking to see if you can go to one of the more powerful versions.

[Mega Masher]

Re: Pulverizer Build Diary

Thanks for the response. I might go for the motor in the following link. I will go for a max RPM of 1000. Is hardox too heavy to use for base, sides and top armour? http://www.robotmarketplace.com/products/0-E30-400.html

[typhoon_driver]

Re: Pulverizer Build Diary

Hardox is perfect for the job

[Mega Masher]

Re: Pulverizer Build Diary

Are you still building Hornet 3?
(By the way the picture attached is of hornet 3 not my robot, though it may look similar in the future.)

[archie2000]

Re: Pulverizer Build Diary

if you want, the equation for speed is.
RPM x wheel size (inches) x pi (3.142[ISH]) that's inches per minuite.
those motors look a lot better.

[typhoon_driver]

Re: Pulverizer Build Diary

Those are just the cheap speed 900s from ebay. The ampflow motors would be far better.

It's still as you see there, really just a piece of hardox atm. Once I have my workshop up and running in my basement I may spend time working on it. It will purely be a whiteboard and demo machine made for a bit of fun. I do still have the basic test chassis that i threw together to test the programming on the orangutan chip as well.

The location of the wheels in the machine is also an interesting point as it affects the spin up and max speed of the machine

[Mega Masher]

Re: Pulverizer Build Diary

I would appreciate some recommendations for some perhaps cheaper motors, as they would be quite costly to repair/buy spare. I have considered going brushless but not sure as to which ones to go for (brushless is just a possibility as i don't happen to have much to spend on motors). Also, just out of intrest, which way should the robot spin?

[typhoon_driver]

Re: Pulverizer Build Diary

Brushless motors don't like to be started and stopped like you can with brushed motors. Plus the electronics would be a whole lot more complex.

In terms of cheap motors that would be useful. Look at scooter motors. Another option would be a bosch 400 (they are rated for 12v) run on 24v although they do weigh around 3.8kg

Doesn't matter about the direction.

[Mega Masher]

Re: Pulverizer Build Diary

Would the wheel be connected through a gearbox or straight to the motor shaft?

[Mega Masher]

Re: Pulverizer Build Diary

What thickness of hardox, how big and what would i cut i with?

[typhoon_driver]

Re: Pulverizer Build Diary

Depends entirely on your design. When it comes to cutting either angle grinder or plasma cutter are your best bet.

[maddox10]

Re: Pulverizer Build Diary

Hardox is annoying to cut with conventional tools.
For outer curvves you can use an angle grinder. But inner curves, and especialy small ones, you'll need plasma or waterjet cutting.

[archie2000]

Re: Pulverizer Build Diary

sorry to hijack this thread a little.
I have seen people get very nice results via laser cutting.
how much would it be for a kind of featherweight size made of 2.5mm steel?
or is there no way of knowing the price.
and does it depend on the sides and sizes of the pieces.
thanks

[Marien]

Re: Pulverizer Build Diary

This still is PulverizeR.

What Maddox probably means, and what I would like to ask you:
Could you please think of a different name because there already is an active robot with the name Pulverizer. It has been aroud since 2000 and has been Robot Wars champion in the second Dutch series.

[typhoon_driver]

Re: Pulverizer Build Diary

Archie your best bet with laser or plasma cutting would be to contact companies direct. Do a search via google for companies specialising in this service.

I realized I missed a question about gearing, you should always look to gear a motor down as far as feasibly possible to reduce the stress on it and your electrical components. You need to work out what rpm you require based on your wheel size, radius of the wheel from the center of rotation and what rpm you desire from the robot. Sit down and try and work it out.