Has anyone got there Robonova-1 to jump?
Has anyone got there Robonova-1 to jump?
by Gort
Tue Oct 31, 2006 1:48 am
I have tried too get my Robonova-1 too jump straight up. The best I have done so far is too standup very fast or too fall over a lot. Any ideas or is it impossible? 
by beermat
Tue Oct 31, 2006 2:04 am
Thought about it, but haven't tried it. Not sure the servos / arrangements have enough 'umph' to get you off the ground, nor what risks this puts certain servos at due to the stresses. Doesn't mean you shouldn't try, though 
Take a browse around Robots Dreams at some of the videos of other robots doing jumps for some pointers. My thoughts are - It's not all in the legs (arms can be used to help drive momentum upwards) and timing is probably the key - for instance if you can generate enough momentum upwards, a move to lift the lower legs up a bit to actually get the ground clearance might be required.
Take a browse around Robots Dreams at some of the videos of other robots doing jumps for some pointers. My thoughts are - It's not all in the legs (arms can be used to help drive momentum upwards) and timing is probably the key - for instance if you can generate enough momentum upwards, a move to lift the lower legs up a bit to actually get the ground clearance might be required.
by hivemind
Tue Oct 31, 2006 12:13 pm
Yes, the default RN-1 can jump. Is it impressive or amazing? at all? No. It is able to just barely lift itself from the ground from swinging its arms just right and tilting the feet servo in so that when it reaches the highest point of its standing position it can flick them back and get itself those few mms off the ground...
Although, if you up the voltage a little (and I do not recommend this so it is not my fault if it breaks) then you should be able to get a little extra 'umph' which in turn gives you the height you might be looking for.
All this being said, I have only seen a couple videos of this and so I havent done so myself. So yes, it should work.
Although, if you up the voltage a little (and I do not recommend this so it is not my fault if it breaks) then you should be able to get a little extra 'umph' which in turn gives you the height you might be looking for.
All this being said, I have only seen a couple videos of this and so I havent done so myself. So yes, it should work.
by tempusmaster
Tue Oct 31, 2006 2:52 pm
I would never be one to discourage experimentation, so please don't take this negatively.
The 'jump' or 'rabbit hop' creates some really extreme stresses on the leg servos, especially the ankles. Think of the robot body as basically a 2 kg. sledge hammer pounding down on the tiny gear teeth in the ankle servos.
It's true that quite a few of the ROBO-ONE 10 finalists were able to get their robots to do it. But quite a few of them dropped out before the competition even started because they did a lot of damage to their robots ankle and leg servos. You may notice that Dr. GIY didn't enter Yokozuna Great in ROBO-ONE 10. It turns out that he didn't want to do that kind of potential damage to the robot.
All that being said, go ahead and go for it. You'll never know until you try.
The 'jump' or 'rabbit hop' creates some really extreme stresses on the leg servos, especially the ankles. Think of the robot body as basically a 2 kg. sledge hammer pounding down on the tiny gear teeth in the ankle servos.
It's true that quite a few of the ROBO-ONE 10 finalists were able to get their robots to do it. But quite a few of them dropped out before the competition even started because they did a lot of damage to their robots ankle and leg servos. You may notice that Dr. GIY didn't enter Yokozuna Great in ROBO-ONE 10. It turns out that he didn't want to do that kind of potential damage to the robot.
All that being said, go ahead and go for it. You'll never know until you try.
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Put off jumping?
by Gort
Tue Oct 31, 2006 11:32 pm
I may put off jumping until I can the new Hitec servos for my robonova. With there more torque and steel gears, they may make it easier for the robonova too jump? Hopefully I can have enough money too replace all my leg servo. Dose any one know when they will show up in the US?
by limor
Wed Nov 01, 2006 10:44 am
Maybe trying to execute a variation of an "Ollie" such as a "kick flip" could work to get the illusion of a high jump (the center-of-mass does not really go up by that much).
However, falling down can damage the high torque servo gears and loosen up the screws around the hips where it is irritatingly difficult to get the screw driver in.
One idea is to relax the servos upon impact and then turn them on again after a 0.3 seconds or so. (?)
However, falling down can damage the high torque servo gears and loosen up the screws around the hips where it is irritatingly difficult to get the screw driver in.
One idea is to relax the servos upon impact and then turn them on again after a 0.3 seconds or so. (?)
by CaptKill4Fun
Sat Nov 04, 2006 4:42 am
Hi, I got mine to jump last June 2006 ...
it was a kind of strange combination of servo movements, but I got about 1/4" + up off the table ...
Buck$2Go Jumps Video.
by tempusmaster
Sat Nov 04, 2006 1:52 pm
CaptKill4Fun wrote:I got mine to jump last June 2006 ...
it was a kind of strange combination of servo movements, but I got about 1/4" + up off the table ...
Interesting stuff - I wouldn't have expected it.
As you mentioned, it is kind of strange.
The leg servos don't appear to move much if at all. The only part of the robot that seems to be generating momentum is the arm that's hidden by the body of the robot, so it's hard to tell what's going on, or how to reproduce it.
It would be great to see a video from the front and/or back and the other side showing the arm movements.
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by beermat
Sat Nov 04, 2006 1:53 pm
Interesting indeed - as tempusmaster said, wouldn't have expected that. Looks like you generate the upward momentum mainly from the arms in this case - the right arm spinning out and around and then the left arm coming up part way through? How much is in the leg servos? Do you have code?
It would help visibility of the hop if the video caption wasn't right over the feet!
It would help visibility of the hop if the video caption wasn't right over the feet!
Post the code
by Gort
Sat Nov 04, 2006 6:34 pm
If you can Capt Kill4Fun post the code. Trying to get my robot too jump has loosened allmost all my screws in my legs of my robot. I just hope my servo gears are not damaged too much? The stress on the robot during the jump seems too be very little compared too what I am doing 
by Bullit
Sun Nov 05, 2006 1:53 am
I had seen this video of CaptKill4Fun's back when it was released and thought not bad and didn't think much of it. But here CaptKill4Fun you stated that you RN-1 hopped 1/4" and I thought wow did it really hop 1/4" ? Even most of the RoboOne's I've seen video of haven't hopped 1/4" so I took a closer look at CaptKill4Fun's video. The physics didn't seem quite right so I did some analysis on the video. As it turns out in CaptKill4Fun's video his RN-1 doesn't hop at all. Please see my attached disection of CaptKill4Fun's video.
not hop
CaptKill4Fun, I would say that standing on one toe for a few milliseconds does not count as a hop. So as far as I can tell the crown of hopping RN-1 still remains unverified!
not hop
CaptKill4Fun, I would say that standing on one toe for a few milliseconds does not count as a hop. So as far as I can tell the crown of hopping RN-1 still remains unverified!
