July 20, 2022 at 5:11 pm #2009
Hi all, I designed a tool that uses a suction cup as the end effector.
I bought a suction cup & vacuum pump similar to what’s found here and designed a 3D printed holder that interfaces with the Thor robot. The kit comes with a controller that converts a servo-type pwm signal to an on-off power output for the vacuum pump. So it easily connects to the same pwm signal that the original gripper uses. You will need a separate 5-6V power supply for the pump, as the current draw is too much for the Arduino’s onboard 5V supply. What I did was make a 6V regulator that feeds directly from the 12V input supply.
The 45 degree angle of the tool helps the robot have a better work envelope. When coupled with the modded Art2BodyUnion part I posted previously, the robot can pick up objects as close as 14cm from the center of the base, to as far as 40cm.
I threaded the vacuum tube down through the inside of the robot, and have the pump in the robot’s base, which
keeps the weight in the arm down.
Here is the STL file and FreeCAD design.
July 20, 2022 at 5:18 pm #2011July 20, 2022 at 8:39 pm #2014
- This topic was modified 6 months, 2 weeks ago by imernchavez.
Impressive job! Thanks for sharing the design! 🙂
I noticed that your robot has bearing supports under the second joint. It seems to me a great solution to release the load that falls on the axis. Have you noticed improvement in the movement?July 23, 2022 at 12:02 am #2017
Good eye! Yes it helps with the sag and improves the accuracy of the robot a bit.July 25, 2022 at 9:43 am #2020
That’s what I was thinking…
Could I ask you for that design as well? I would like to include it in the modifications section of the github repository along with the design of your end-effector!
In fact, if you have a github account and want to make a pull request with your designs to Thor’s repository, I’ll be happy to accept it 🙂August 2, 2022 at 7:23 am #2023
Pull request created! My first public contribution to GitHub. More to come soon 😉August 6, 2022 at 10:25 am #2026
Thanks for the contribution! 😉October 13, 2022 at 3:34 pm #2087sebasshareParticipant
I have a question about the video: how do you send so many grbl instructions and the arm doesn’t lose any movement? I mean, we try to send a couple of g-code strings and some of them are not performed because the arduino mega misses them.
You have made a modification to add a bracket to art2 that helps support the weight of the arm. That’s was the solution for loss torque or arm fall?
Tengo una pregunta sobre el video: como envías tantas instrucciones en g-code y las ejecute sin que el brazo pierda ninguna de ellas? Nosotros cuando enviamos varias instrucciones juntas, algunas de ellas no se ejecutan porque el arduino mega las pierde.
La modificación que hiciste en la articulación 2 sirvió para evitar la pérdida de torque o caída del brazo?
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