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Old 22nd December 2011, 20:22   #1
SimonC
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Default On30 small turntable

Hi all.

Been turning in circles recently

The PCBs for this small turnable came about 4 weeks ago, I finally got around to finishing the kit.
This little feller is a 4 way cross Turntable....wagon turntable in UK-speak.
Would suit On30, 0-16.5 and probably quite useful for the Gn15er's.
I have it in mind for coming Kitwood Hill Mining layout

Functionally it has 90deg indexing, 4 road power routing (ie full electrofrog), and a high torque motor with gearbox that runs off a single AA battery.
The wipers are phosophor bronze strip mounted to small PCBs

I have made this as simple as possible to put together. Soldering the rails isn't actaully that tricky - (I made rail jigs for that) but I guess I'm going to be offering a pre-soldered rail option (for extra cost) for those that don't fancy tackling the rails.

'nuff chat, heres some piccies



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Old 22nd December 2011, 20:46   #2
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Default Re: On30 small turntable

Here is the heart of it - the PCB.
Note that the turntable will work for DC and DCC.
Its wired like an electrofrog diamond crossing: as it turns the polarity remians correct.
Note however that if your Porter has sound there are 4 dead zones. with the crossways turntable it's close to impossible to solve that...AND make it DC compatible.
I have other ideas there however...I'll start another thread for that.
BTW I aimed to make this as complete as possible - but keep simplicity to give a great value price. There's too many high price turntables!

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Old 23rd December 2011, 20:56   #3
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Default Re: On30 small turntable

Very nice job. How could I get an idea of its price?
Franco
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Old 28th December 2011, 11:44   #4
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Default Re: On30 small turntable

Thanks for your interest Franco.
Price will be 34.50 for the whole kit inc motor.
I will also offer option with the rails presoldered to the PCB for an extra 12.50.

If there is interest, I may consider a manual version for 24.50. However as the indexing is done by stopping the motor you'd have to align the tracks by eye.
But for only 10 the motor and gearbox and indexing feature is very good value.

BTW the version above is with code75 rail. There is version with code 100 rail just by using a different thickness of wood for one of the spacer elements.
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Old 28th December 2011, 20:30   #5
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Default Re: On30 small turntable

Well, a reasonable price indeed, at the moment I have been forced to stop active modelling but I'll keep in mind for the future.
Do you think price will increase considerably for a 0 scale standard gauge one (diameter between 20 and 25 cms)?
Franco
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Old 29th December 2011, 00:32   #6
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Default Re: On30 small turntable

20cms..isn't that a bit big for a wagon turntable? Did they have 9m standard guage wagon turntables in continental Europe?
In UK, standard guage wagon turntables were around 15ft. 15' is 105mm diameter in 7mm scale (1/43).
If I made it exactly the same way, but with 105mm diameter PCB, then price would be approx 20% more.
But 200mm diameter can't have a huge PCB - it has to be done different way to keep cost down.

I will be making at least 3 sizes of "normal" turntable for On30 (can be used for HO of course).
4" one will be ~30,
9" one will be 50 (max)
Both including motor. these will be flat deck type.
The 15" one will be gallows type - haven't thought about that yet! (other than the motor+gearbox).
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Old 29th December 2011, 09:47   #7
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Default Re: On30 small turntable

I was thinking at the possibility of turning a small 0-6-0T for a small depot!
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Old 29th December 2011, 14:15   #8
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Default Re: On30 small turntable

OK. I'll bear standard O guage version in mind when designing 9" turntable
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Old 16th January 2012, 11:39   #9
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Default Re: On30 small turntable

Just an update: rail options are code70, code83 (looks good and works with all stock), and code100 (the chunky looking rail used with Peco's On30 track).
I did try code 75 bullhead rail but its a mare for soldering to the PCB. To hold accurately in the jig needs flat bottom rail.
To be honest code 70 and code83 look nearly the same when in the turntable - the rail head width is < 0.1mm difference and you can't really see the depth, so I may take code 70 off the menu

Hugh, hope you got the PM's.
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Old 26th January 2012, 23:09   #10
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Default Re: On30 small turntable

Dang, Simon that is one cool turntable. priced right too it should sell good.
rich
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