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Peco LK-55 - Forum Contents Index. - Reference Area. - Your Model Railway Club
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 Posted: Sat Oct 15th, 2016 03:04 am
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RobB
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I have recently installed a Peco LK-55 Turntable together with a proprietary indexing kit. The indexing components are good quality and comprise a photo cell activated by a serrated disc, giving access to ten in/out roads. The turntable bridge rotates both clockwise and anticlockwise but because of inherent backlash in the drive gearbox the indexing to the roads can vary by up to 3mm and the bridge when indexed to a road can wander within this 3mm discrepancy. I'm sure this problem is not new, but can anyone offer a solution.   

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 Posted: Sat Oct 15th, 2016 02:03 pm
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BCDR
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Hi Robin,

If it's the kit I'm thinking of the motor/gearbox supplier was recently changed. 3mm (0.12") is a lot of backlash for a gear-head motor, especially if it's a planetary gear design (zero backlash). Could this be a mechanical issue? (slop in the brass bracket holders, loose grub screws on the shaft holder, binding of the bridge support wheels, well wall distortion as it goes around, the whole turntable moving around in it's hole)? Do you see this degree of movement with an empty, unloaded turntable?

Gearhead motors suffer from lateral torsion due to the output shaft not being concentric with the motor shaft, hence the need for bullet-proof bracing of the motor and the turntable to prevent movement.

Nigel



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 Posted: Sun Oct 16th, 2016 12:14 am
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RobB
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Thanks Nigel. I think I can discount the mechanical issues. There is minimal (but necessary) backlash at the gearbox but this still translates to 3mm slop at the edge of the bridge, and in my view indexing has to be accurate and positive otherwise you might just as well rely on manual control.

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 Posted: Sun Oct 16th, 2016 02:29 am
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BCDR
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Hi Robin,

Sounds like it's not fit for intended purpose (and not a planetary gearhead). And one of those situations where sending it back could get expensive. 3mm slop is unfortunately is a derailing issue.

Nigel



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 Posted: Sun Oct 16th, 2016 10:41 am
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allan downes
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Many years ago now my solution to the non availability of a UK motorised turntable, and let alone a turntable of any sort other than in kit form, I used to convert the Flieschmann turn tables into something that looked convincingly British. I also managed to convert one to take an O gauge white metal  0-6-0 tank engine although it did struggle somewhat with the sudden unexpected  and inconsiderate weight imposed upon it ! In return for this however, and no doubt by way of protest,  it did eject fine wisps of smoke that freely spiralled up majestically from the motor department when turning a loco but not enough to alert the fire brigade.

Allan.

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