Asked
— Edited
i found these grippers,where you can actully grip something whithout,
burning the servo when stalling.they work on 5 volt up to 12 volt.
grippers
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The only way to protect a servo from being damaged is to not force it to move further than physical limitations. This is because that's how a servo works, but using all its force to move into the desired position. Find out how a servo works here: http://www.ez-robot.com/Tutorials/Lesson/48?courseId=6
Dampening/cushioning the gripper with foam is a partial solution to aid gripping. The most reliable solution is to adjust your gripper position based on the object that it is gripping, as specified in the tutorial learn section.
Take your human hand, for example. You do not attempt to close it with all your ability every time you hold an object. If you did, you would be the hulk and squish everything.
So the same common sense logic must be applied to Robotics. You cannot program a gripper servo to move to its furthest close position every time it attempts to hold something.
thanks for the link and warning.
That being said, as DJ pointed out, that advertisement is simply a lie.
Alan
I know there are all sorts of pressure sensors available separately, so I'm betting it's been found that simple resistance to the servo motor is inadequate, but I'd be interested to know why. Is it that you have to apply a large force before obtaining the resistance, thereby only knowing after the effect that you've squished the object already?
Lego gear with clutch
I actually have scripts that do just that for my Roli claws (although I don't currently have feedback, the script just executes as long as I have a key or joystick button depressed. Putting some kind of pressure feedback is the next step). Works pretty well, although if I recall I am stepping 2 or 3 steps when closing and 5 when opening.
If I remember I can post the scripts when I get home, or just look for Myroli-MKii project on the cloud. The claw controls are in the script manager.
Alan
Link
Aaron
Review of this board and servo feedback system
For some reason the EZ Robot YouTube attachment tool isn't working for this video so here's the link to a vid showing this board:
https://youtu.be/2gXBWEkjcMs?list=PLQdu_G7xyFIQwE8RSTNcM2FJCxGKkiW9n
Here is a video DJ made a few years ago (pre revolution) doing just that.
https://youtu.be/s5xezqGwIHI
Alan
My idea stems from the recent book, "the robot you always wanted" by John B.
in his design(where my CY comes from) he uses the EZB grippers, Pololu IR sensers and a limit switch for each hand. Even an additional webcam to visually see the objects being placed or picked up, all arm servos and sensors connected to a Meastro 24 usb servo driver. He even designed his own interface thats very V3 like with bluetooth and uses his Robotbasic for sw. Seems to work pretty well too.