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« Last post by jwatte on March 03, 2014, 06:48:56 PM »
Electro-adhesion does not work on raw brick.
And, in general, the answer to your question is likely "no."
I suggest putting steel plate in/behind the wall, and using strong electromagnets in the feet :-)
« Last post by waltr on March 03, 2014, 06:39:50 PM »
The $50 Bot is a great place to start for getting practical experience. That project can be expanded on in many ways once you get the basics down.
It uses the same family processor that the Ardiuno uses so these would complement each other nicely. Coding is done in C so you have a good start on this part.
« Last post by bdeuell on March 03, 2014, 05:31:29 PM »
for servo 2 the distance used to calculate torque would be cos(45deg)*15cm=10.6 kg*cm because you are limiting the range of motion. I suspect acceleration is of little concern (if I am interpreting your use correctly) you will be fallowing the sun with the arm. As Jwatte mentioned you do not want to operate the servo continuously at stall so you will need to use a larger servo to prevent damage due to overheating.
Servo 1 can be smaller than servo 2 but it is difficult to specify an exact torque without knowing the details of the design as much of the load may come from friction on this axis.
« Last post by vipulan12 on March 03, 2014, 04:00:03 PM »
Hi everyone, is their a component or material (that i could buy)that uses electro-adhesion to stick two surfaces together
so that i could build a robot that could walk on walls (look at attachment)
« Last post by rrr on March 03, 2014, 01:54:13 PM »
Hi all and thanks for this great website + forum
I finished my Bsc in mechanical engineering in the field of control&robotics and now I'm going for my masters in robust control. The thing is that I know( hope that a lot ) about control&robotics but only from the theoretical side. for instance, I was in a group that participated in the DARPA challenge (unfortunately we did not win
) but what we did there is control ideas- no real stuff. I decided I have to get some real experience of robots so maybe I will be able to build a small robot to test the thesis I'm working on. I wanted to ask, where should I start? should I build the 50$ robot? maybe to start with arduino? I know to program well in matlab and a bit in C
Thanks for your advice
« Last post by kevinthesun on March 03, 2014, 01:53:30 PM »
Thank you for your help!
« Last post by alehandro on March 03, 2014, 12:39:53 PM »
Thank you for replying. Here's a sketch, if it's to sloppy tell me to do a better one..
I will have a sun panel instead of a gripper and some other stuff too and that's why the weight of the arm and load will be 1kg.. It will go only 45degrees left and 45degrees right and the center of the L2 arm 15cm will be facing up. Which should the torque of the elbow servo be?
« Last post by SuperMiguel on March 03, 2014, 11:32:51 AM »
LifeCam Cinema Webcam - 720p HD (With Mount) (http://www.trossenrobotics.com/p/Microsoft-LifeCam-Cinema-Webcam-HD-robot-camera.aspx
) mounted it but never used it... Selling it for $50 shipped
Robotis CM700 $70 (including usb programmer)
Robotis RC-100 $25
Robotis USB2DYNAMIXEL $30
Also selling a HCR platform (http://www.dfrobot.com/index.php?route=product/product&path=37_111&product_id=361
) with motors, encoders, sensors, battery, ill probably add a kinect, all for $400 shipped, us only
Also i have many Xbees (around
that im willing to sale.
US only, Paypal Only...
« Last post by jwatte on March 03, 2014, 11:32:10 AM »
I think "silent" will be the biggest problem.
You could wind a number of coils around the perimeter, and use a number of permanent magnets attached under the disc (assuming it's not magnetic itself) and sequence them to make a synchronous brushless motor out of the whole thing. That'd be kind-of neat, noiseless, and hidden. And hard :-)
Anything with a gearbox is likely to make some noise. Perhaps it can be shielded with some foam or whatever, so it's good enough?
« Last post by jwatte on March 03, 2014, 11:28:46 AM »
You will need to post a drawing or sketch of some kind -- I don't understand what you intend to convey with "L2 at vertical."
If the longest distance your gripper will be from the center is 25 centimeters, and the weight of your load plus the arm is 1 kg, then the holding torque of the L1 servo needs to be at least 25 kg.cm.
"stall torque" is the rating for an actuator/motor at which the motor stops and cannot produce any more torque. A motor that is held in stall for more than one or a few seconds is likely to destroy itself. When you see only one rating for a motor, it's usually the "stall torque," if you intend to apply continuous torque, the "working torque" of a motor will typically be 0.20 or 0.25 times the stall torque.
Thus, for a holding torque of 25 kg.cm, you may need a motor with stall torque rating of 125 kg.cm.
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