robonova size and max. load capacity

[vicong50]

hi,

is it possible to redesign and scale the robonova up to 1 metre high? Currently the robonova is around 30 cm high. Can it handle the weight if i redesign the brackets and make it to at least 1 meter high?

If i have other heavy components that i want to add, like a webcam and a laptop-computer system (around 2kg), can the 16 servos in the robonova handle the weight?

thanks for answering my questions...

[Gort]

What servos are you going to use? What are you going to make the brackets out of and how thick? I think you would need to answer those two questions first.

[i-Bot]

Scaling the Robonova is probably not a good start for a 1 Metre biped. Making it 3 times the size will also increase the weight by a large amount even before adding the additional load of the laptop. I would guess the total weight would end up at least 15Kilo compared to existing 1.5 Kilo even using light materials.

This would require servos with 30 times the torque. Speed might be reduced to compensate for part of that, but I guess you are still needing 10 times the torque of the existing servos and some additional gearing.

You may want to post your question more generally at the Lynxmotion site. You really need some help from someone already making 1Metre bipeds.

[vicong50]

thanks for replies...

i was thinking of using the original items like the servos and boards, and fabricating my own metal brackets. I will use aluminium 1.5 - 2mm thickness and will anodize to get the colour effect.

what if i remove the laptop and just scale the robonova without adding additional items? would the current servos provided with the robonova work?

[vicong50]

i currently have machines that can cut and bend the aluminum to the shape and design i need...

and i will use back the servos that comes with the robonova...

is it powerful enough?

what is a suitable size i can scale it without needing to change any servos?

thanks for any replies...

[DirtyRoboto]

I am not sure about 1 metre but you can scale RN up to about 2 ft which is what I am looking at doing now i have 2 of them

[My Bear]

I've re manufactured the torso and now have a robonova at 60cm high, i've also placed the robonova inside of a Teddy Bear!

I had to reduce the feet slightly to accommodate the Bear body, sounds like a recipe for disaster but stability is OK and no servo problems to date, although I feel its pushing the envelope a little.

[DirtyRoboto]

yea I remember you had left out some WAIT commands a while back.
How is the project going by the way? have you put together any stories yet.

DR.

[My Bear]

Hi DR

Yes I've written the pilot and have spent forever designing other characters, which unfortunately have to be hand control puppets until funds allow Robotic models as well.

The 'bear' is complete and with the aid of a hand puppet duplicate I can capture most moves/shots.

One command you might be able to help me with is one to make the servos react at 'highspeed'. I use robobasic and can alter the speed but I want the robonova to extend its legs in one super fast move to catapult him off the ground, however, when I type in HIGHSPEED it just highlights in yellow because I'm missing something or could this be the incorrect command anyway? I'm trying to achieve the fastest movement possible which the servos will allow, perhaps a servo move command?

Also cannot achieve as yet unassisted walking, can create a shuffle walk, but the second he tries to lift a foot off the ground, it all goes pear shaped, perhaps I'm trying to achieve the impossible?

I'll post a video once I've filmed a few more moves, It's surreal.

If completely successful I've then got a cat, three crows, a spider, a wasp! and a further bear to give the Robonova treatment to.

Cheers

Darren

[badlands]

In roboBASIC the highspeed command is HIGHSPEED SETON or HIGHSPEED SETOFF.

[DirtyRoboto]

As badlands says

HIGHSPEED SETON
(and also)
SPEED 15
(and another thing to help)
PTP SETOFF

The RN1 will not get lift-off but it can still move fast.

I really want to find out about the 3 crows, spider and wasp. What a cool combo.

[My Bear]

Thanks Badlands and DR, I now have highspeed, cool.

One further question if I may, I tried to make the ROBONOVA do sit ups, however in its modified form the top end is heavy.

So if I hold the legs and program the hip servos to lift the torso from horizontal they struggle to accomplish the move/slow/need light assistance.

The answer could be a simple one, in that they are not powerful enough, however I wondered whether I could alter the torque being applied within the program language?

Sorry, for what are probably simple programming questions.

I must say the Robonova through all of its mods and tests has been completely reliable, even with a fur body covering it!

Cheers guys

Photos and vid shortly.

[DirtyRoboto]

As done by humans, move the arms infront of the body at it lifts. the arms should add extra weight to the duty direction of the servo and so reduce some of the stress.

This needs to be done after the robo has reached 45 deg angle. you might look at adding some weights to the robos hands to help.

[vicong50]

hi thanks for all the replies...

will it work if i install 2 servo motors per joint? example in the picture below...



the above pic is for 1 leg only....

can the robonova work with 2 servos per joint after i increase and scale the size bigger?

how can i program using roboscript for proper alignment?

thanks...

[DirtyRoboto]

so that is 20 servos for 2 legs !!!
Now you have to squeeze the rest of the body into 6 servos