the robot arm accuracy test


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As backers constantly complain about 7bots accuracy, i have made a video instruction for a 'universal' robot arm accuracy test'.
  1. put the meter (caliper) at 45° angle right of robot arm (so all axes are involved in moving to caliper)
  2. 500g payload
  3. set the caliper to 0.00 mm
  4. 1 second wait at meter (caliper)
  5. Then move to the left.
  6. Move to a random point in left robot sphere (at least 5 different points covering the entire working area).
  7. Then back to the point left of meter, then to meter :-)
  8. Repeat for 5 minutes at top speed.
  9. Be yourself in the video (so no cutting out of bad cycles)
  10. Final result (test outcome): How many cycles and max error (the worst deviation, either negative or positve)

I strongly recommend (urge) 7bot to NOT do this test until the dobot-team have done it! They are the ones to boast with 0.2mm accuracy.
Let us see how many steps their accurate stepper motors will lose when 500g speed around for 5 minutes. I will not be surprised when they refuse to do the test.

Roland, the born loser, alias Robo Durden. This video is public domain. (animated boy used under cc 3.0)

introducing: 7bot :-)


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Have spent this Saturday evening (6 hours) to make a simple nice blender 3d-model :-)
Can use it for further cool "use cases".. But already nice to see all the 6 axes in action :-)
And my model has "inverse kinematics" :-)
So what you see in the video is just the moving around of a target (3d crosslines) in 3d space. The two-finger gripper automatically follows the target. On top, i can control the axes 4,5 and 6 to adjust the direction, the gripper is gripping the target. With inverse-kinematics it is really fun to let a robot arm dance :-)

I am really glad, that the 7bot-team spends most of their time on the software! Without good software, a robot arm is worth nothing !

Free blender file for you: 7bot.blend

*use case 1* - a 3d mill


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You don't need 0.2mm precision when drilling with a 5mm tool! But you need absolute positioning,force feedback and and at least downwards- and sideways milling.
Here the free blender 3d-software with my inverse-kinematics (IK) target (crosslines) and the 3 crosslines to further control axis 5,6 and 7 (the way the dremel targets the head)

As 7bot will provide IK, controling the 7bot will be a kids game.

Did program a huge KUKA in 2013 to perform as a 3d mill.. kukamill1.jpg kukamill2.jpg kukamill3.jpg

*use case 3* - make stunning video presentations:


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@7bot, only your robot arm is perfect for this:
1. with your 6 axes you can move to any waypoint and let the camera look in any direction.
2. You can easily record the path (better waypoints) by moving the arm around !
You can do such a stunning video by using a 7bot to move around another 7bot in just 5 minutes. And exactly because it will take only 5 minutes, hundreds of photographers and movie makers would love to get your 6-axis 7bot !!!
!!! A robot arm is for freely moving around in 3d space !!!
Later someone of us might be happy to code a little program which can change the delays between the waypoints and even play back a music track so we can record the video in sync with a song. That would be awesome. Only your 7bot and such a little software would make for a new $50k kickstarter campaign.
!!! Make a video like my animation and tell everyone with a new update !!!
You can get the best free music at www.ccmixter.org !
This is the song i used: http://ccmixter.org/files/george_ellinas/15924
Another crazy top notch song from George Ellinas: http://ccmixter.org/files/george_ellinas/28107
And yes of course.. extending the forearm to 1 meter and putting the 7bot drop down on a 6 meters rail would make every movie maker go crazy.