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Home project: What type of motor do I need for a battery-powered motorized 'lazy susan'?

Hi, I wonder if anyone could help me with what motor I should get for a project.

In my project, I want to create a battery-powered motorized ‘lazy susan’, where the top part of wood will spin with an object on top. I am quite confident on how I will attach all the components to do this as there are many youtube tutorials on the internet that show a similar thing – here is a link to one that might give you a better idea of what I am talking about: https://www.youtube.com/watch?v=sPTWccIgEQo)

But what I am unsure of is what type of motor to get, so my question is:

What type of motor and battery voltage do I need to support the load of around 1.2kg of weight (the combined weight of the top piece of wood that will spin and the object on top of that) and still spin the load quite fast (up to 120rpm)?

I understand that the speed of the motor reduces with more load but I am unsure of how to work out what type of motor and battery I will need for my requirements.

I will also be attaching a reducer to my circuit so that I can control the speed of the motor.

The lazy susan has to be battery powered as I intend to film it outside.

Any help would be really appreciated!

Helen

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Comments

May 16, 2021 05:57

This is always the tricky part of a project.
In this case I believe it will be determined by the starting torque to get the platform rotating and that is obviously dependent on the bearing it is rotating on.
If you have the lazy susan you could try adding a bit of string from a fixed point and via some means bend though 90 degrees over a smooth rod and gently add weights (from scales, fishing weights, or 'stones' until the platform starts rotating and then from the weight and distance from the centre of the string calculate the starting torque required.
Looking at the YouTube videos, most seem to be using a 3W geared motor, so you may just want to start with something like that wirth the required gear ratio.
I would probably drive the turn table via pulleys or gears rather than having it mounted on the gearbox shaft as they tend to be rated for radial loads and not lengthwise along the shaft.
The lazy susan shaft could be located in a bearing and the end of the shaft onto a ball bearing to take the load.
Many record player turntables work this way.
I'm not sure I have helped much, but once you have the drive set up you can then measure the current taken under normal load and work out what size battery will be required for the operation time.

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