Share:
Notifications
Clear all

[Sticky] project UPDATES

Page 1 / 4

350a26dd49eb55d3494500240423a207?s=80&d=mm&r=g
(@robotn1)
Member Admin
Joined: 5 years ago
Posts: 727
Topic starter  

Hi everyone.
You will find the projects updates here: https://www.jjrobots.com/robotic-arm-scara-project-updates/

Please feel free to comment everything you want about this robotic arm.
Would you like a extremely small gripper for the arm? Concerned about its size?
You have had bad experiences with other robotic arms? which ones?

You can leave a comment in this sub-forum or just add it to the page indicated above using your facebook account.
It is now or never! 🙂


Quote
b8d280648de5151887d3262c9070add7?s=80&d=mm&r=g
 rob
(@rob)
Member Customer
Joined: 4 years ago
Posts: 1
 

Hi everyone.
You will find the projects updates here: https://www.jjrobots.com/robotic-arm-scara-project-updates/

Please feel free to comment everything you want about this robotic arm.
Would you like a extremely small gripper for the arm? Concerned about its size?
You have had bad experiences with other robotic arms? which ones?

You can leave a comment in this sub-forum or just add it to the page indicated above using your facebook account.
It is now or never! 🙂


Hi there, I wrote up a blog post http://robdobson.com/2018/01/not-so-droopy-scara-robot-arm/ about a SCARA I built a little while ago in case there is something there that might help you.


ReplyQuote
350a26dd49eb55d3494500240423a207?s=80&d=mm&r=g
(@robotn1)
Member Admin
Joined: 5 years ago
Posts: 727
Topic starter  

Hi there, I wrote up a blog post http://robdobson.com/2018/01/not-so-droopy-scara-robot-arm/ about a SCARA I built a little while ago in case there is something there that might help you.

Hi Rob,
Thank you for this.We will take a deep look at your post. It has a lot of useful info and ideas.

On our side: We are still testing the control board.

The ARMBOT frame is almost finished. The stability of the robot and accuracy/speed compromise has been the most time consuming thing to “solve”. We have had to re-locate the motors more than 5 times redesigning the whole arm. Working with a fully extended arm (with load) shifted its center of gravity 6 cms making the Z axis very inaccurate (+- 5 mm). Now, without load the center of gravity is located between the motors (-11mm from the XY “origin”) and with a load of 250 grams it moves to +15mm, not compromising balance or precision.

This is the current status of the robotic arm frame: Armbot Vertical and horizontal CLAMPs

Would you like to collaborate once the control electronics are completely functional? We can send you a prototype version if you want.


ReplyQuote
0d3d3f588831f1cb5951f0d4db8d34c8?s=80&d=mm&r=g
(@faurog)
Member
Joined: 3 years ago
Posts: 1
 

Hi everyone.
You will find the projects updates here: https://www.jjrobots.com/robotic-arm-scara-project-updates/

Please feel free to comment everything you want about this robotic arm.
Would you like a extremely small gripper for the arm? Concerned about its size?
You have had bad experiences with other robotic arms? which ones?

You can leave a comment in this sub-forum or just add it to the page indicated above using your facebook account.
It is now or never! 🙂

Hi, J. I was wondering if it would be possible to use some Mechaduinos ([url= http://tropical-labs.com/mechaduino/]) with the stepper motors to close the loop. I’m afraid the only issue would be with z-axis, unless I use some kind of standoffs to create some space on the base. Would it cause any instability? What do you think? Thank you.


ReplyQuote
350a26dd49eb55d3494500240423a207?s=80&d=mm&r=g
(@robotn1)
Member Admin
Joined: 5 years ago
Posts: 727
Topic starter  

Right now the steppers are not missing a single step and to close the loop we are using the smartphone camera (detecting some features on the “working area”). Even forcing with strong accelerations the arm, the stepper motors are behaving nicely


ReplyQuote
7bfd12abfa54b0d8f6c39bbc62a45c89?s=80&d=mm&r=g
(@cjlocey)
Member Customer
Joined: 3 years ago
Posts: 25
 

Right now the steppers are not missing a single step and to close the loop we are using the smartphone camera (detecting some features on the “working area”). Even forcing with strong accelerations the arm, the stepper motors are behaving nicely

What is the status us us being able to start building one of these? I am really interested in making one!


ReplyQuote
350a26dd49eb55d3494500240423a207?s=80&d=mm&r=g
(@robotn1)
Member Admin
Joined: 5 years ago
Posts: 727
Topic starter  

Right now the steppers are not missing a single step and to close the loop we are using the smartphone camera (detecting some features on the “working area”). Even forcing with strong accelerations the arm, the stepper motors are behaving nicely

What is the status us us being able to start building one of these? I am really interested in making one!

Hi!
We are working on the control APP and python code. To be honest, making the robot affordable and easy to modify if needed is quite a job! We will post something soon. Thanks for the interest!

jjRobots TEAM


ReplyQuote
7bfd12abfa54b0d8f6c39bbc62a45c89?s=80&d=mm&r=g
(@cjlocey)
Member Customer
Joined: 3 years ago
Posts: 25
 

Right now the steppers are not missing a single step and to close the loop we are using the smartphone camera (detecting some features on the “working area”). Even forcing with strong accelerations the arm, the stepper motors are behaving nicely

What is the status us us being able to start building one of these? I am really interested in making one!

Hi!
We are working on the control APP and python code. To be honest, making the robot affordable and easy to modify if needed is quite a job! We will post something soon. Thanks for the interest!

jjRobots TEAM

If you have any of the .stl files available so I can start printing, it would be great. Otherwise I may start printing the robot you used as your reference.


ReplyQuote
81f99ad2ea3e5f3bf4179ba5e098a2cf?s=80&d=mm&r=g
(@calvinbrice)
Member
Joined: 2 years ago
Posts: 3
 

Right now the steppers are not missing a single step and to close the loop we are using the smartphone camera (detecting some features on the “working area”). Even forcing with strong accelerations the arm, the stepper motors are behaving nicely

What is the status us us being able to start building one of these? I am really interested in making one!

Hi!
We are working on the control APP and python code. To be honest, making the robot affordable and easy to modify if needed is quite a job! We will post something soon. Thanks for the interest!

jjRobots TEAM

If you have any of the .stl files available so I can start printing, it would be great. Otherwise I may start printing the robot you used as your reference.

Beta STL files are now available!


ReplyQuote
7bfd12abfa54b0d8f6c39bbc62a45c89?s=80&d=mm&r=g
(@cjlocey)
Member Customer
Joined: 3 years ago
Posts: 25
 

How are you planning on controlling the arm? I am thinking about using an arduino mega with a RAMPS 1.4 board. I would like to try to use this as a 3D printer or and engraver with my J Tech Photonics laser mounted on the end.
I have seen that there is an option to use MARLIN by enabling the SCARA option within.
Thought?


ReplyQuote
350a26dd49eb55d3494500240423a207?s=80&d=mm&r=g
(@robotn1)
Member Admin
Joined: 5 years ago
Posts: 727
Topic starter  

How are you planning on controlling the arm? I am thinking about using an arduino mega with a RAMPS 1.4 board. I would like to try to use this as a 3D printer or and engraver with my J Tech Photonics laser mounted on the end.
I have seen that there is an option to use MARLIN by enabling the SCARA option within.
Thought?

We have created an Arduino M0 board to control it (with 3 stepper motor outputs, servo outputs and additional 3-12V controllable port for an electromagnet or vacuum pump). That does not mean the SCARA can not be controlled by many other electronic boards like a Marlin board + Arduino MEGA (but it will need servos control)

We wanted to have everything in the same board and control it using Python.
The inverse kinematic is ready and the python libraries almost.


ReplyQuote
7bfd12abfa54b0d8f6c39bbc62a45c89?s=80&d=mm&r=g
(@cjlocey)
Member Customer
Joined: 3 years ago
Posts: 25
 

AWESOME. Will your board allow us to use the arm as a 3D printer?


ReplyQuote
350a26dd49eb55d3494500240423a207?s=80&d=mm&r=g
(@robotn1)
Member Admin
Joined: 5 years ago
Posts: 727
Topic starter  

AWESOME. Will your board allow us to use the arm as a 3D printer?

The control board will need to heat a nozzle up and that will requiere a lot of power (current). The control board will not be able to handle that current but with an external MOSFET and temperature sensor is doable


ReplyQuote
7bfd12abfa54b0d8f6c39bbc62a45c89?s=80&d=mm&r=g
(@cjlocey)
Member Customer
Joined: 3 years ago
Posts: 25
 

I have all the parts printed and I am waiting for the hardware to arrive. I ordered all the hardware listed but can you tell me what the 3x 623 ball bearings are for?


ReplyQuote
350a26dd49eb55d3494500240423a207?s=80&d=mm&r=g
(@robotn1)
Member Admin
Joined: 5 years ago
Posts: 727
Topic starter  

I have all the parts printed and I am waiting for the hardware to arrive. I ordered all the hardware listed but can you tell me what the 3x 623 ball bearings are for?

2 ball bearings are used in the clamp. Another one here: http://forums.jjrobots.com/attachment.php?aid=390
You can see the ball bearing attached with a M3 10mm/6mm bolt on the bottom of the arm


ReplyQuote
Page 1 / 4
Share: