CH3 payload?

Lynxmotion Legged Robots
1

Hello -

Anybody know the max payload for the CH3-R with the standard HS-475 servos? What about with the 645 servo upgrade?

I’m starting to design a turret, and I don’t want to overload the puppy…

Thanks -
A_J

2

The CH3-R is not the strongest due to the long (stylish) tibia. The BH3-R is actually the strongest. The CH3-R doesn’t support much more weight than the bot equipped as in the tutorials including batteries. There is no magic formula when figuring the payload. I mean more weight causes more current draw and certainly shortens the run time. But we have never added additional weight till the robot is no longer capable of standing up, so it’s really a difficult thing to quantify. However doing this as long as I have you can get a “feel” for what is possible. I would conservatively say an additional 12 to 16 ounces wouldn’t cause too much trouble. With the 645 servos an additional 32 to 36 oz. should be ok. Sorry I missed this post.

3

I have an EEE PC that i would love to house on my hexapod as a brain. It weights almost 1 kg. Would any of the hexapods be able to lift that? I’m thinking a lot about the weight distribution as well. Most of the weight is distributed at the back of the lap-top where the batteries are. Does that make it harder.

4

With the 645 servos an additional 32 to 36 oz. should be ok.

5

Thanks for the reply - I think I should be ok with the standard servos, since so far I’m designing it with a styrene frame and lexan shell, so it’d just be the weight of that plus your pan and tilt brackets, two servos, and some light electronics (LEDs and sensors). If that goes ok, I’ll go from there, and if not I’ve got a good excuse for upgrading the servos :slight_smile: - but I’ll post if I find some quantitative measure of payload…

6

And you might consider rigging an extension harness for the laptop battery to be able to mount it somewhere else, like centered in the lower frame - for example, I’m running the 2800mAh battery which is considerably bigger and heavier than the standard 1600mAh, so I relocated both boards topside, and made a battery tray to hold the battery underneath and centered. Not that lowering the center of gravity would have a huge effect with the hexapod design, but if I’m adding a turret on top it couldn’t hurt. Plus it looks a lot cleaner IMO, and gives easy access to both boards.