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How to mount a rotating tray above a servo?
1138 1 Mar 18.2020, 18:05:34

I'm working on a project where I want to have a servo rotate a tray. Originally I was going to use a larger servo so I was just going to mount the tray directly to the servo and let the servo bear the weight. But in my new attempt at the project I'm going to use a smaller servo (MG90S Servo 9G Micro Servo) and I don't think it will hold the weight that I want. It's not that its supporting much weight but the servo is going to be at the corner of a pie-ish shaped tray and all of the weight will be at the bell end. So even with just some random light junk in a 3d printed tray it will still have a fair amount of torque on the mounting point.
What's the best way to mount the tray so that the servo can still rotate it? Ideally I'd like to directly couple the tray to the servo for rotational purposes (i.e. no gears or belts, but on extension axle from the servo head to the tray is fine). I guess what I need is some kind of bearing that has a bracket on it that I could screw the tray onto but that is hollow in the middle for my drive axle to go through. Does

something like that already exist and if so what is the name?
I'm hoping that something already exists and I won't have to design/print my own.

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A****min

Mar 23.2020, 09:48:48

If that is a difficult task already you should look for stuff to re purpose. Look for hard drive motors for example, they have exceptionally play free bearins, are smooth running, have screw holes an are available everywhere. They usually don’t have a shaft access on the backside though, so you will need some non direct drive method for attaching.

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