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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
California 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.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
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.
Registered Member #1956
Joined: Wed Feb 04 2009, 01:22PM
Location: Jersey City
Posts: 172
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.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
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
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.
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
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
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.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
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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California State University, Chico: ScorBOT Project...
