building a drum spinner

[Max]

ill have a 1vs1 battle with you after one of the shows if we can?

[harry hills]

what?

[mattsdragons]

I'm as confused as you harry

[Max]

Ok, just to clarify
By private fight I meant battle between robots not as part of a competions but private. I quoted matt to say it was not an actual event but a private fight afterwoods
Happy?
Good, now can we get back to answering my questions?
Just to get back on topic, could I make my own controller for the drum with a servo and micro switches?

[typhoon_driver]

use a battle switch and one of these

http://cgi.ebay.co.uk/Automotive-Relay- ... 1e6344df4e

or one of these

http://www.jaycarelectronics.co.uk/prod ... BCATID=754

The second relay is more expensive however it is far more reliable as it is a solid state relay (no moving parts). The lack of moving parts means that there is no chance of the relay fusing when it switches over (the spark that comes when you connect wires). I would not recommend a servo because it isn't an iron clad failsafe when radio contact is lost.

Boner, when it used speed 900s, used the solid state relay and a battle switch (battle switch to interface with radio gear and switch on the larger relay which directly controlled the motor)

[Max]

i am conserned that those second hand batteries will be knackered so want to buy a new set. i came across these:
http://www.batterymasters.co.uk/Product ... _1916.aspx
would they be able to do both the drill motors for the drive and the speed 900s for the drum? I was not sure if they would be able to deliver the amount of current needed.
Thanks
Max

[jonny]

i'd say shove in a lipo

[typhoon_driver]

If a speed 900 is too expensive then lipos will be well out.

Those batteries will not be suitable. They are designed for standby applications where the current draw is minimal so they won't be able to supply the current. The second hand ones that Ed is selling are a good deal. Knowing Ed he will have only used the best chargers to charge and maintain them.

[Max]

i will buy the 2nd hand nicds and i will buy speed 900s for the drum,
where can i get a v-belt pulley for the speed 900 and what type do i need?i will buy the battle swithch from robochalenge and the other relay as well.

[Max]

Hi
could i use this as my second relay (in conjuntion with a robochalenge battleswitch) to control a speed 900 motor to power the spinning drum:
http://www.halfords.com/webapp/wcs/stor ... e=shopping
the 100A relay of jaycar looked way to expensive for a relay
and again, what gear ratio do i need between the speed 900 and the drum?
thanks