SG90 ROBOTIC ARM

DEVLOG #3

I almost printed this with one pretty big problem…

Today I finished the rotating platform for the robot arm, and I also made a little servo horn fitting gauge.

I added the holes for the cross servo horn, then made the wall that will hold the shoulder servo.

The wall looked a little thin, so I added two triangular supports behind it.

They connect the wall to the platform and should stop it from bending under the weight of the arm.

Right before printing, I realized the servo bolts had nothing to tighten into inside the hollow base.

So I’m getting an M2 bolt-and-nut kit. The bolts will pass through the printed base and servo ears, then the nuts will hold everything from underneath.

Next, I’m printing the fixed base and rotating platform.

Then I’ll install both servos and check if everything fits, feels strong, and rotates without rubbing.

Do you think the wall and triangular supports look strong enough, or should I make them thicker before printing, or do you guys have any other suggestions or feedback?

D E V L O G # 2
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BUILDING THE BASE
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Alright, quick update again haha.
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The first servo fit gauge was too loose, so I measured the servo again and made a new one with a 23.4 × 12.4 mm opening. This one fit much better.
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After I finished that, I measured the mounting holes and figured out the correct position for the servo shaft.
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Then, I started designing the actual base. I made the circular housing, added the servo opening and mounting holes, built a 30 mm support wall, and added a notch for the servo wire. - (PLEASE let me know if you have any suggestions)
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The fixed part of the base is basically finished.
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NEXT: Designing the rotating platform.

I’m starting to work on my SG90 robot arm! Honestly, coming into this project, I was a bit skeptical on how I would even start. But now that I did, I found that it wasn’t so hard! For this session, I technically worked for an hour, but I guess I forgot to take a time-lapse of it. I worked on getting all the materials, getting servo measurements, setting everything up, and finally modeling and printing a fit gauge to test if the measurements for the servo fit ok to continue. On to the base!  (Next session) In the next session, I’ll continue to get into things more, and probably start modeling the base. See you next time!!