Torque required for hammer to self right?

**maddox10** · 19th December 2012, 10:09

2 Gimson GR01's

**Ellis** · 19th December 2012, 10:10

Originally Posted by mattsdragons

Very nice machine, what motor are you using behind the axe?

Previous page, man.

Edit: Mario beat me to it!

**mattsdragons** · 19th December 2012, 10:45

That's nice, didnt look at the other page, just the video

**ady** · 19th December 2012, 17:26

Very nice, have u any plans to stop it getting stuck on its side?

**shakesc** · 19th December 2012, 18:24

Havent tested yet as I did a complete strip down to do some welding
Its not too obvious but the side panels are not vertical
I'm banking on that plus the axe changing the centre of gravity will force the bot upside which I can self right from.
If that doesnt work then some spikes on the side (I liked the look of the kebab skewers that someone else posted) look fun and would make it more unsteady

**shakesc** · 19th December 2012, 18:37

Still pondering a scooter motor. Those buggers are heavy though (MY1016 are 2Kg) - I know the Aussies use them

MY6812 are quoted as 0.42 Nm @ 24V
MY1016 are quoted as 0.61 Nm @ 24V / 2932 rpm [max efficiency]
These would really need a 2 stage reduction

Gimson's are 1.41Nm at peak

My main problem is packaging. The battery is higher up than I want it to be. [it fits but feels too vulnerable]
Might move the motors up to allow the battery to be packaged in the guts of the machine and moving the electronics (TZ85A's) to one side.
I can save weight by moving from pillow bearings (convenient but heavy) to simple bushing. For now its a runner (well, once its all bolted back together

)

**ewan** · 20th December 2012, 00:45

Much more than 1.41Nm 'at peak', I think you're quoting the maximum efficiency torque.

**PJ-27** · 20th December 2012, 07:22

Don't forget you need to get the li-po out for charging and in the stress of the pit having it buried deep in the robot is the last thing you want.

**Daniel** · 23rd December 2012, 00:25

A couple of videos just to prove to can get a scooter motor powered axe into a 5mm steel chassis and get it under 13.6kg

Not the best camera angle and you should ignore the fact that the drill gearboxes fell out of the robot