building a drum spinner

[Max]

Hi, where do people get the pulleys and belts from?

[Laser]

Technobots

[typhoon_driver]

I use rs components for mine. Less than 2 quid for a replacement belt

[typhoon_driver]

O and you can pick up dirt cheap relays on ebay. Do a search for 24v relay and look for one in the 30 to 40 amp range. Seen them for less than 2quid each

[jonny]

You can also get relays for a quid each from a scrapyard

[typhoon_driver]

Getting ones that can handle 24v from a scrappy might be tricky

[Max]

Hi,
I've got most the parts for the robot apart from wire, connectors and relay which are on order from Jaycar electronics but have not arrived yet(even though I've been waiting for 20 days!)
I have bought the 12v sanyo nicad batteries but don't know what I need to charge them? I've got an overlander power rc 6s charger but It looks much smaller than the ones shown on this forum.
Also, I have calculated that I've got around 1.5kg for the drum and have figured out that if I use steel it will only be 1.5mm thick, will this be strong enough or should I make it out of aluminium?
Thanks,

[typhoon_driver]

Lol they're coming from australia so it's not surprising on the time!

You need a charger that can charge nicads/nimh. As long as it can charge a 12V pack it should be fine as long as it can supply around 2A to the battery pack. Could you pop up a pic of your charger?

What diameter drum is that for? What style of teeth are you planning on using? (ring or bar)

[Max]

The drum will be 75mm in diameter but 85mm including teeth, I plan to weld on a number of hooked teeth like the ones on a circular saw but much thicker and with only two teeth in a circle, it is quite hard to explain.

[typhoon_driver]

Take a look at either boner or drumroll. Are the teeth a similar design? (Jamie has a few in his build thread)

I would recommend a drum material thickness of around 3mm. This is the same as both boner and drumroll and the drums have survived hits with some of the worst spinners in the arena.