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Peco Frizinghall turntable

4068 Views 8 Replies 7 Participants Last post by  CKC45
I have installed the Peco OO turntable with the Frizinghall motor kit. There have been other threads about this combination but not mentioning this particular problem as far as I am aware.
The motor is driven from the same Gaugemaster controller as the track, via a DPDT centre-off switch
It works (subject to installing the polarity switch) but the rotation is not smooth; the turntable judders. The worm is not jammed against the large gear:

so I can't see why this is happening.
The one design fault I find is that having cemented the securing collar underneath, one can not get to the central spindle for maintenance or adjustment.
Can anyone advise? Thanks. Colin
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Expat's suggestion is a good enginering practise approach and will solve the problem. What you could also do is:

Take the worm wheel off the shaft and evaluate how freely the table turns under finger power. As assembled mine needed PTFE lube on the carrier wheel axles and plastic compatible grease on the table shaft before it turned really freely, particularly when carrying my heavier locos (500 - 750g).

Take the gearbox off, turn through 90 degrees so that the worm shaft is much closer to the underside of the turntable, reattach gearbox as close as possible to turntable shaft while clearing worm wheel, fit worm wheel to mesh.

That shortens the working lengths of the shafts (less length to flex) hopefully reduces the driving force required (less force flexing the shafts) and may be enough to deliver the required improvement.

The first time I saw one of these kits, the user had attached the gearbox to the underside of the turntable pit. Not only could you hear every meshing tooth, (the pit base acting as an efficient loudspeaker diaphragm) but by attaching a small piece of shiny metal to the pit base and directing a light at it while the motor was running, the turntable pit could be seen to be flexing in time with the audible 'wow-wow' of the drive and perceptibly pulsing table motion.
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