Technic turntable drive for a 00-gauge model railway

[Bjorn]

In an attempt to combine two hobbies, I am designing a Lego Technic drive motor for a turntable on a 00-gauge railway.

The railway is 1:76 scale, far smaller than Lego trains. The tracks are 16mm apart and about 1mm wide if I had to guess.

All this means that the turntable drive needs to find its position very accurately to avoid derailments.

What I've come up with is a Powered Up L-motor and hub in a can. The whole thing rotates. The motor drives a worm gear to a 24 tooth gear, then a 12 tooth gear drives the 140 tooth large gear for a total reduction of 1:280.

I am not sure if I've got everything correct, so ask away! Next step for me is to order some parts, gather the parts that I have and start building.

[Toastie]

Nice turn table!

How do you want to sense/detect/define the individual stopping positions of the table?

Best
Thorsten

 

[Bjorn]

6 hours ago, Toastie said:

Nice turn table!

How do you want to sense/detect/define the individual stopping positions of the table?

Best
Thorsten

 

That's the reason to use Powered Up. The large motor has a built-in encoder so it "knows" where it is and I will be able to define positions in the app. 

I expect there to be drift, that the positions will shift slightly over time, so I will need to recalibrate the position hopefully only daily or so.