Team Eventorizon: Build Diary

[typhoon_driver]

no need for a press. Take out the grub screws at the back of the motor and a swift tap with a hammer will knock it out.

I would go for a keyway on the shaft if possible rather than a grub. I've had many issues in the past with grubs coming loose.

[Eventorizon]

You need a press to put the shaft back in as it is a press fit. There are some 10mm silver steel bars in the back of a cupboard which would be good to switch to.

I was going to get one of the technicians to put a flat on the shaft which would be a little better.

[typhoon_driver]

Hammer works for both removal and installation. Alternatively a 4 inch bench vice generally has all the length you will need to install and remove shafts.

[RogueTwoRobots]

Agreed. I swapped the shaft of my brushless from 5mm to 8mm using just a hammer and a vice. Cutting the circlip groove was done by putting the shaft in the pillar drill chuck and holding a hacksaw against it while it was spinning. It's worked fine ever since (about the only part of the machine that hasn't broken down).

[Eventorizon]

Maybe it is worth the effort then. Its got a 6mm shaft already but going to 8 or even 10 might be a good move if I can get the pulley over it.
Conker 3's HK-4035-800kv comes with an 8mm shaft as standard so no mods needed there.

[Eventorizon]

Had this little idea a few days back.
Replaceable Weapon Pulley Mockup.jpg
This would be a custom pulley attached to the weapon shaft (The hole is square for a reason)
If I wanted to change the ratio I could slide the pulley off the motor shaft, undo the 2 bolts holding this on, swap it for another then slide the other pulley back onto the motor shaft with the belt over it. Saves me totally dismantling the robot.
I don't think I will use it but its a interesting idea.

[Ellis]

Convenient way to swap pulleys but you'd have to change the belt too wouldn't you? In which case you'd have to dismantle it some anyway. Unless you have an adjustable tensioner.

[Eventorizon]

I wouldn't need to change the belt cos I also change the pulley on the motor as well. So I would go from say 12T to 14T then maybe down to 10T. All the slack is taken out on the large pulley

[Eventorizon]

Thanks to the Laser cutter at my university my massive mess up with the wheels has been resolved.
2013-05-24 12.43.34.jpg
It takes about 5 mins per wheel but I was able to re-cut each hole. I set them up to sit in a piece of 9mm MDF board with a series of 73mm holes in. I put each wheel in a hole then cut a 19mm hexagon into each wheel. The cut was 0.3mm larger than the input so it came out at 19.06mm per hole which is a very tight fit on the 19.5mm hex shaft
2013-05-24 13.44.35.jpg
Afterwards I am left with some perfectly straight wheels and these random little bits of plastic.
2013-05-24 14.16.06.jpg

[Eventorizon]

A note to anyone buying from Banebots...

The parts I ordered were:
-4x RS775 Motors
-4x 16:1 7nn Gearbox's
-8x 73mm Wheels
-8x 1/2 inch Hubs, 1 Wide

Cost £303 which is no problem.

The import tax on that (Which I got the letter for this morning) is £61.65. That's an additional 20%.

I know there isn't anything we can do about it but I just thought I would let people know.

[typhoon_driver]

That's standard for all imports over a certain value. Welcome to the uk

[shakesc]

yep, hate to think the tax man might go without.....

[Gaseraki]

Sometimes you get lucky when importing things. When ever I get upset about how things are so much cheaper in the states I realise that Brazil is far worse then us when I visit.
55% additional Tax

[Eventorizon]

Well the parts are finally here and I can say one thing... We are never going to run out of wheels!
2013-06-05 10.52.49.jpg
I also didn't quite appreciate just how big a motor I was using for my drive!
2013-06-05 10.55.00.jpg 2013-06-05 10.56.29.jpg
Conker 3 is going to SHIFT!

[Gaseraki]

Pfft you think your motors are big? I laugh at your puny "big motors"
Jokes aside, Looking really nice so far. Why So many wheels? Spares?