California State University, Chico: ScorBOT Project...
Patrick, Mon Oct 24 2011, 04:05AMCalifornia State University, Chico: ScorBOT Project...
New side project, while developing my previous devices I've been tasked to and accepted the challenge of making an old robotic arm fit for educational use. I believe this bot was used in industry for production, and was then scraped, but rescued by Professor Dale Word, (MS in EE). On campus we have been needing motion control of a more sophisticated level then just the small-typical cars/servos/and hacked toys. So, this bot once repaired will be perfect.
As it has been explained to me by Professor Word, students will deveolp their MCU and programming--one per student, then when due each student will bring their MCU+program to the robot device, plug in and activate a series of bot movements, then their work will be graded.
So to bring a new life to a previously used bot, I will need 2 fixes to make this bot upto a usable level.
1) I need an all new electronics section.
--- New H-bridges, 6 of them.
--- New linear reg PS, 12v @ 8 amps.
--- Logic buffer for the students to connect there MCU's to the bot.
--- Cooling and safety features.
2) Mechanical Mods are needed.
--- End travel and limit switches need to be replaced/fixed.
--- New wire harness laid up.
--- Servos and encoding wheels need some fixing and repair.
Getting started with a wood case.
Painted...
Re: California State University, Chico: ScorBOT Project...
radhoo, Tue Oct 25 2011, 01:19PM
Nice project.
Here's my Hbridge design used with my little robots:
. Feel free to use it if it fits your needs.
radhoo, Tue Oct 25 2011, 01:19PM
Nice project.
Here's my Hbridge design used with my little robots:
. Feel free to use it if it fits your needs.Re: California State University, Chico: ScorBOT Project...
Patrick, Tue Oct 25 2011, 03:46PM
Im using the LMD18200, in the 11 lead to-220 case type, its what my professor had on hand. but they cost 17 USD each, so im very careful how i use them.
Patrick, Tue Oct 25 2011, 03:46PM
Im using the LMD18200, in the 11 lead to-220 case type, its what my professor had on hand. but they cost 17 USD each, so im very careful how i use them.
Re: California State University, Chico: ScorBOT Project...
tobias, Tue Oct 25 2011, 09:32PM
Does the arm stop at any position with disconnected motors?
If it does I would buy an emergency stop button, a safety relay and some contactors to make sure it's going to stop right away if you need, no software, logic ICs or student-made stuff on the way.
Safety first!
All the best
tobias, Tue Oct 25 2011, 09:32PM
Does the arm stop at any position with disconnected motors?
If it does I would buy an emergency stop button, a safety relay and some contactors to make sure it's going to stop right away if you need, no software, logic ICs or student-made stuff on the way.
Safety first!
All the best
Re: California State University, Chico: ScorBOT Project...
Patrick, Tue Oct 25 2011, 11:08PM
Ill include a button for safety purposes i was thinking of the E-stop permenently enabling the brakes on each ic. that would short each motors windings together. it would stop fast, and resist moving by gravity or inertia.
Patrick, Tue Oct 25 2011, 11:08PM
tobias wrote ...
Does the arm stop at any position with disconnected motors?
If it does I would buy an emergency stop button, a safety relay and some contactors to make sure it's going to stop right away if you need, no software, logic ICs or student-made stuff on the way.
Safety first!
All the best
Does the arm stop at any position with disconnected motors?
If it does I would buy an emergency stop button, a safety relay and some contactors to make sure it's going to stop right away if you need, no software, logic ICs or student-made stuff on the way.
Safety first!
All the best
Ill include a button for safety purposes i was thinking of the E-stop permenently enabling the brakes on each ic. that would short each motors windings together. it would stop fast, and resist moving by gravity or inertia.
Re: California State University, Chico: ScorBOT Project...
Goodchild, Wed Oct 26 2011, 07:47AM
If you are in danger from an arm that small.... I must be clinically insane with the stuff I do.
Come on really? it's like 2 foot tall! hehe
Nice little arm non the less. Reminds me of my FIRST robotics days back in high school. Good luck with the protect.
Goodchild, Wed Oct 26 2011, 07:47AM
tobias wrote ...
Does the arm stop at any position with disconnected motors?
If it does I would buy an emergency stop button, a safety relay and some contactors to make sure it's going to stop right away if you need, no software, logic ICs or student-made stuff on the way.
Safety first!
All the best
Does the arm stop at any position with disconnected motors?
If it does I would buy an emergency stop button, a safety relay and some contactors to make sure it's going to stop right away if you need, no software, logic ICs or student-made stuff on the way.
Safety first!
All the best
If you are in danger from an arm that small.... I must be clinically insane with the stuff I do.
Come on really? it's like 2 foot tall! hehe
Nice little arm non the less. Reminds me of my FIRST robotics days back in high school. Good luck with the protect.
Re: California State University, Chico: ScorBOT Project...
Dr. Drone, Wed Oct 26 2011, 04:00PM
Dr. Drone, Wed Oct 26 2011, 04:00PM
Re: California State University, Chico: ScorBOT Project...
Patrick, Mon Jan 09 2012, 05:07AM
ok nearing completion...
im etching the boards tonight...
ok, from left to right: fans, on/off toggle, E-stop, LED's for functions, and printer ports available for I/O.
circuit layout, as it will be.
Too many dam holes to count...
the traces...
HCL + H2O2 etching solution, more than one hour ....
Patrick, Mon Jan 09 2012, 05:07AM
ok nearing completion...
im etching the boards tonight...
ok, from left to right: fans, on/off toggle, E-stop, LED's for functions, and printer ports available for I/O.
circuit layout, as it will be.
Too many dam holes to count...
the traces...
HCL + H2O2 etching solution, more than one hour ....
Re: California State University, Chico: ScorBOT Project...
Patrick, Tue Jan 10 2012, 05:27AM
pics of continued work, it takes 10 hours to make each board, 1 down one more to go.
Patrick, Tue Jan 10 2012, 05:27AM
pics of continued work, it takes 10 hours to make each board, 1 down one more to go.
Re: California State University, Chico: ScorBOT Project...
Patrick, Sun Jan 15 2012, 06:46AM
pics...
On the left, the red/black wire is power to the motor. the blue and white cable and socket is a cat 5 cord and RJ-45 socket, for quadrature and limit switch signals.
Patrick, Sun Jan 15 2012, 06:46AM
pics...
On the left, the red/black wire is power to the motor. the blue and white cable and socket is a cat 5 cord and RJ-45 socket, for quadrature and limit switch signals.
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