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1749da22343b0d85c39164b5c6f52fed?s=80&d=mm&r=g
(@mappler)
Eminent Member
Joined: 3 months ago
Posts: 22
04/12/2020 1:07 am  

We received one standard servo and one continuous rotation servo.  Does it matter which one goes where on the gripper?

Thanks,

 -Matt


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(@robotn1)
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Joined: 5 years ago
Posts: 698
04/01/2021 1:54 pm  

Hi Matt… a continuous rotation servo? A SG92R?


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1749da22343b0d85c39164b5c6f52fed?s=80&d=mm&r=g
(@mappler)
Eminent Member
Joined: 3 months ago
Posts: 22
04/01/2021 2:07 pm  

@robotn1

Yes, it is an SG92R – which now that I think about it should NOT be continuous rotation.  This is the one that burned out on me.  Perhaps there was something mechanically wrong with it.  I replaced it with another one (I have many) and it seems to be working pretty well.  I don’t have the gripper dialed in yet.  I’m not getting a good open and close, but I know the directions say it is a little touchy and I probably have some screws too tight.

 -Matt


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1749da22343b0d85c39164b5c6f52fed?s=80&d=mm&r=g
(@mappler)
Eminent Member
Joined: 3 months ago
Posts: 22
04/01/2021 7:43 pm  

Looks like just bad luck on the servo.  The plastic shaft on the right side of this picture was broken and the two free plastic bits were embedded into the gears. 😉  I’m not sure if that caused its continuous rotation or was the after effect of it over rotating.

IMG 7470

 -Matt


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350a26dd49eb55d3494500240423a207?s=80&d=mm&r=g
(@robotn1)
Honorable Member Admin
Joined: 5 years ago
Posts: 698
07/01/2021 10:29 am  
Posted by: @mappler

@robotn1

Yes, it is an SG92R – which now that I think about it should NOT be continuous rotation.  This is the one that burned out on me.  Perhaps there was something mechanically wrong with it.  I replaced it with another one (I have many) and it seems to be working pretty well.  I don’t have the gripper dialed in yet.  I’m not getting a good open and close, but I know the directions say it is a little touchy and I probably have some screws too tight.

 -Matt

No, it should not be a continuous rotation servo… 😐

Adjusting the gripper´s servos is a bit tricky. Keep in mind this: when the gripper is fully closed, the servos should not be forced to stay in that “position” too long. I mean: these servos can handle gears “deformation” when they are spinning, but just for some time. Otherwise they will get hot and can get damaged.

Do not place the rubber band until the servos movements look fine for you. The rubber band´s job is to help the gripper to close applying “gripping force” so the servo can rest in the meantime.

Once the gripper can fully close and the open/close range is correct, put the rubber band


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1749da22343b0d85c39164b5c6f52fed?s=80&d=mm&r=g
(@mappler)
Eminent Member
Joined: 3 months ago
Posts: 22
12/01/2021 10:27 pm  

@robotn1

Ok, the gripper is adjusted MUCH better now.  I now have full motion on the arm and the gripper.

 -Matt


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