Bit of advice on my drumbot please

[calumco]

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Last picture showing the weight, need to make a new motor bracket atm so the motor won't be looking wonkey much longer, was going to go for lipos but for the space i had avaliable nimhs were easier to work with. may go for a slightly lighter weapon as the drums 3.7 kg atm aswell wana hopefully aim for a 3kg weapon

[typhoon_driver]

Sell the nimh and get lipo. Find space to fit them in. You would notice a huge difference if you were to do a direct comparison in spin up time.

[RogueTwoRobots]

It's a drum, it's ridiculously compact and it's blue - what's not to like?

[PJ-27]

Your not Scottish as well are you Calum?!

[RogueTwoRobots]

Being Scottish is awesome, so it's no wonder everyone wants a piece of the action

[calumco]

I would gary but the cost of buying more batteries and chargers etc isnt something i can afford atm so if anything i'd upgrade that later on. decided i wanted to put what money i have into a new weapon for the time being.

and yeah lol i couldnt decide what colour to go for and i thought i'll go blue to match the other drumbots lol

[death robotics]

[quote=calumco]LOL jamie haha

gary i could kiss you..... quote]

Proof that FRA members know each other a little too well

[widow_twanky]

Can i just ask why people use belts for the drive on the drum?

I get the gear reduction and shock absorbtion issue. I'm asking because i have some sprockets and chain which would probably suit and just wanted to know the pros and cons of each

Andy

[RogueTwoRobots]

Both are perfectly usable forms of transmission for drums. I think I chose belts over chains initially because I wanted a bit of slip (although not sure how much a timing belt actually slips during a hit) and if you have flanges on the pulleys, the belt is less likely to come off, whereas a chain could be prone to jumping off or snapping during a large impact. Having said that, I've never worked with chains and sprockets on spinning weapons, but I'm sure I've seen DragonStrike's chain on the arena floor more often than on the motor/disc (and it usually seems to make its way there after a large impact)

And for the obvious; pulleys are lighter than sprockets and easier to machine, which is handy if your facilities are limited. You can get larger reductions in gearing for a certain diameter than you can with sprockets although they usually are the more expensive option, albeit only by a few quid.

They're the main reasons that come to mind and why I chose belts, but if you've got - and want to use - chains, it shouldn't be too much of an issue.

[PJ-27]

NST snapped a chain at the last UK Champs and I think that was the only bot to use chain driven weaponary.

Chains are a nice option because they're readily available and you can make them to the size you want, plus everything Jamie said....