Robo Challenge - Predator

cheers PJ

We will be using our eyes and control finger instead of limit switches :)

there will be physical stops on either end too.

Been working on the arm mechanism this last week. All the bit have arrived including my nice little ball screw :)

I really wanted to work the arms off a drill motor as they are nice and easy to replace and can be put under good strain with out burning out when used at the normal voltage. Only snag was its too big to fit in the robot so I set about making the gearbox smaller.

Machined out gearbox is as short as I could make it. finger crossed it fits!

Machining out the drive gear for the motor side

Hey presto! finished motor mount/gearbox with modified shaft and arms drive gear.

The motor is as short as I can make it however looking at the drawings its about 10mm too high to fit in. The shoulder mount supports and the tail servo will now be cut out and modified to fit the arm mech :( bit of a set back but should be ok once its done. I just hope the drill motor is enough to self right otherwise the toys may come out the pram.

Gearbox looks sweet James, What ratio did you go for in the end? Isnt it worth putting an astroflight on there?

Ye i was tempted but with how expensive they are and easily it is to burn them out under high prolonged stress I thought it better to get with something cheap. Its the gear out of a drill gearbox so the same ratio as before.

Wouldn't a couple of big servos cut it?

Sorry to say it James, but when you put this into full combat, if it breaks, you're going to cry so hard. :P

you could use 5th scale metal gear servos?
looks great :)