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project UPDATES
01-02-2018, 11:37 AM (This post was last modified: 01-02-2018 11:39 AM by JJrobots JP.)
Post: #1
project UPDATES
Hi everyone.
You will find the projects updates here: https://www.jjrobots.com/robotic-arm-sca...t-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?

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It is now or never! :-)
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01-30-2018, 06:39 PM (This post was last modified: 01-30-2018 06:42 PM by robdobsn.)
Post: #2
RE: project UPDATES
(01-02-2018 11:37 AM)JJrobots JP Wrote:  Hi everyone.
You will find the projects updates here: https://www.jjrobots.com/robotic-arm-sca...t-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-droo...robot-arm/ about a SCARA I built a little while ago in case there is something there that might help you.
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01-31-2018, 12:26 PM
Post: #3
RE: project UPDATES
[/quote]

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

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: [Image: Armbot-Vertical-and-horizontal-CLAMPs.png]

Would you like to collaborate once the control electronics are completely functional? We can send you a prototype version if you want.
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11-30-2018, 03:11 PM
Post: #4
RE: project UPDATES
(01-02-2018 11:37 AM)JJrobots JP Wrote:  Hi everyone.
You will find the projects updates here: https://www.jjrobots.com/robotic-arm-sca...t-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.
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12-01-2018, 05:21 PM (This post was last modified: 12-01-2018 05:28 PM by JJrobots JP.)
Post: #5
RE: project UPDATES
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
.mp4  SCARA.mp4 (Size: 2.67 MB / Downloads: 20)
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