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hube268
Nov 14, 2019
In Questions
Hi Chris, I've purchased all the parts to upgrade my AR2 to AR3 but have run into a issue right at the start. Your AR3 Robot Manuel shows additional mounting holes for the encoders on the back of the steppers. My steppers do not have additional mounting holes in the back. I'm assuming that I need to drill/tap these myself? I don't see anywhere in the instructions where it directs me to do this... I'm also confused on the length of the shaft out the back... mine all seem short. The instructions included with the encoder are pretty basic and do not really help to solve this issue. Thanks!
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hube268
Sep 14, 2019
In Robot Builds
I'm working with a small group of students to pilot a new education program called Robot Inc. We're challenging students to start their own robotics startup. We have a thriving First Robotics program but I've always been disappointment by how much money and effort goes into those competitions only to build a robot that really doesn't do real work. Additionally the robots are always very similar year to year and are remote controlled instead of autonomous. If that same effort and funding could be going to building a real robot that does useful work, then I'm sure we can find willing buyers. We're using the AR2 to give the students real robotics experience before they create their own custom robot. This robot was 3D printed on a Uprint FDM printer. This type of printer creates almost solid parts and is highly reliable. Additionally, we laser cut the covers out of 1/8" black acrylic The cover support for J2 was 3D printed as one piece on a Mark Forged Onyx printer with kevlar reinforcement to give it a bit more rigidity. We still have some adjustments to do as well as clean up the wiring but its looking pretty good. We're having fun getting used to the software. One cool upgrade would be to use Dynamix servo motors with feedback. If those were used then you could "teach" the arm by physically moving it to the position you wanted then teaching it that position. You could also then incorporate crash detection. It would definitely increase the cost substantially but could be a worthwhile improvement for the pro users.
AR2 3D Printed Version  content media
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hube268
Sep 11, 2019
In Questions
Hi Chris, I'm just about finished with my AR2 and ran into one issue with wiring up the pneumatic valve. In the picture of on Pg33 of the Electrical Enclosure manual, you have a small picture of the solenoid valve with the flyover diode. In that picture you have a 3-wire connection however in the picture right next to it, You just have a +24v and -24V connections... Is the 3rd green wire just a ground wire? Also, are the arrows for which screw terminals on the relay board correct? It seems its pointing to the NO and NC pins, however that means there will never be a connection no matter if the relay is activated or not right? Thank you!
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hube268
Nov 11, 2018
In General Discussion
So the PDF version of the BOM is difficult to use especially since its divided up into multiple pdf's. I've compiled a excel version with links and pricing as of a few months ago. I hope this helps. I may have left out a few small things so make sure you double check but I'd say its at least 98% complete. https://www.dropbox.com/sh/6ro0spbk73dct6r/AADXVMoAVMKZWToJF17E_QBra?dl=0
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