Cooked servo.

A project log for Arcus-3D-P1 - Pick and Place for 3D printers

Open source, mostly 3D printable, lightweight pick and place head for a standard groove mount

daren-schwenkeDaren Schwenke 10/22/2018 at 08:422 Comments

I cooked my SG90 mirror arm servo, and I don't have another one just like it.  I set the up position too high, so it was stalled the entire time I was figuring out why I lost half my light ring.

It still works, ironically, but it gets really hot now, and moves really slowly.  Like 10 seconds per 1/4 rotation slow.

I have the MG90 knockoffs which jitter terribly, and some HS-53 Hitec ones, without arms long enough.

There is some super glue attempting to make the Hitec ones work.  Cross your fingers, and I might actually get a video done.


And I cooked another one.  Limits were off by 2.5 degrees.  Homing set the servo to 0, which was just outside of the range.  Fixed in software now...



Lee Cook wrote 10/24/2018 at 11:42 point

Would it not be better (for alignment and less burned out servos) to convert cheaper servos to continuous rotation and have limit sensors at the two extents?

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Daren Schwenke wrote 11/03/2018 at 01:18 point

That would work, and would be dead simple/isolated with just two switches and a relay.  Did that for my projector screen and you even get motor braking at both extents.  However, I don't have the room for the 'extended' limit switch without adding thickness to the base.

If I had re-calibrated it properly, I would not have had this issue.  I swapped my A and C axis (mirror/rotation) at the last minute to better align with what Openpnp wanted, and I rushed it due to the contest deadline.  This was my fault.

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