Electronics > Projects, Designs, and Technical Stuff
How to mount a rotating tray above a servo
Youkai:
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.
ataradov:
From reasonably cheap options this encoder comes to mind https://www.ebay.com/itm/360RES-Rotary-Encoder-A-B-5-24V-D38mm/381383100145
It has aluminum machined flange with bearings already in it. It is very smooth.
twospoons:
I think you're looking for a "pillow block".
e.g.
https://www.amazon.com/UCF202-10-Quality-Pillow-bearing-square/dp/B00RKEXXAS
ataradov:
--- Quote from: twospoons on February 15, 2020, 04:35:17 am ---I think you're looking for a "pillow block".
--- End quote ---
If I'm imagining the application correctly, traditional pillow blocks would be a bit heavy and big for this.
Youkai:
Ok so a pillow block is kind of what I'm thinking I guess. Though those are a bit bulky and expensive for my purpose. It's going to be used in a mechanical jewelry box. I guess I'll probably need to make something like that out of an RC car bearing or similar. I could probably print a housing for the bearing that would support the tray.
I'm not sure how exactly the Rotary Encoder helps. Does that replace the servo?
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