Turntable drive motor

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GWR_fan
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Turntable drive motor

Postby GWR_fan » Fri Apr 06, 2018 10:35 am

Saw this on evilbay. A 12 volt geared output motor with selection of RPM. I thought that the 3 RPM version might be suited to driving a turntable. I believe the output shaft is 6 mm. One can purchase 6 mm drive collets for RC boats with a selection of shafts to attach to the turntable deck. I believe the Peco version is a 4 mm input and a 6 mm/4 mm collet is available.

https://www.ebay.com.au/itm/DC-12V-Redu ... 1438.l2649

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Re: Turntable drive motor

Postby Bufferstop » Fri Apr 06, 2018 10:46 am

Check the specifications for a great rendition of Chinglish
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TimberSurf
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Re: Turntable drive motor

Postby TimberSurf » Fri Apr 06, 2018 11:19 am

I think the 2RPM would be a more realistic speed.
The only issue with a center drive will be the backlash!
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Emettman
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Re: Turntable drive motor

Postby Emettman » Fri Apr 06, 2018 3:37 pm

TimberSurf wrote:I think the 2RPM would be a more realistic speed.


I agree, but waiting 15 seconds for that 180 turn can seem like a long time!

The only issue with a center drive will be the backlash


How many roads are we talking about, and how far from the operating position (for visual alignment?)

Easiest of all (cheating?) is dedicated entrance and exit roads, with a 2 road shed beyond them. (With extra sheds not directly on TT.)

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D605Eagle
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Re: Turntable drive motor

Postby D605Eagle » Fri Apr 06, 2018 6:35 pm

I bought a high quality turntable motor from Locomotech, and even that has far too much backlash. In reality you need to use worm drives to reduce backlash, multiple gears is a no win situation. I did think about trying to create a notch for the turntable to engage for each track but I couldn't work out how to do it.

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RAFHAAA96
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Re: Turntable drive motor

Postby RAFHAAA96 » Sat Apr 07, 2018 8:28 am

Backlash - the blurb says the spindle is locking suggesting worm drive.
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Paul-H
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Re: Turntable drive motor

Postby Paul-H » Sat Apr 07, 2018 9:06 am

I have one of these (Although one of the faster ones) in a record cleaning machine I built, just checked it and there is no backlash at the shaft.

Paul

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D605Eagle
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Re: Turntable drive motor

Postby D605Eagle » Sat Apr 07, 2018 2:18 pm

Paul-H wrote:I have one of these (Although one of the faster ones) in a record cleaning machine I built, just checked it and there is no backlash at the shaft.

Paul

Now I'm interested Paul! I might change it for the motor I have at the moment if thats the case.

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Emettman
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Re: Turntable drive motor

Postby Emettman » Sat Apr 07, 2018 7:29 pm

This is somewhat cheating, but when ensuring the alignment of a turntable is an issue for any reason there are two easy side-steps.
The first is when the turntable only does that, on its own siding. It only has to turn 180° so stops can be used.
(preferably with an elastic drive mechanism to avoid instant strain to the drive.)

The bigger version of this cheat gives more function to the turntable, allowing it to serve a 2-road shed (or bigger if there are points *beyond* the turntable.) Any bigger capacity would need a second shed elsewhere,with one possibility shown in the sketch below.

I have certainly seen this "one route in, one route out" formation on station plans, but I don't know if it was exclusive to particular regions.
This was drawn in Hornby just for convenience.

shed.jpg
shed.jpg (44.93 KiB) Viewed 236 times


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