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7mm/ft O scale 75ft turntable

  • O scale 75ft (23m) turntable. 7mm/ft
  • 75ft bridge during prototype assembly
  • Profile of 23m (75ft) O scale turntable.
  • cross section. girder bridge with outriggers for decking support and hand rails
  • chequer-plate adds interesting detail, and optional C&L code124 rail and chairs look great. simple jig centres the rails
  • wheel splashers cover the wheels
  • 28mm delrin wheels with ball race bearings give smooth ride with minimal friction
  • "Big Worm" 0.6rpm motor has plenty of grunt.
Price:
£110.00
SKU:
KHT770
Scale:
Shipping:
Calculated at checkout
Maximum Purchase:
1 unit(s)
Quantity:


Product Description

75ft O scale (7mm/ft scale) turntable kit.

A new ABC gearbox coupled to a powerful KHM motor is coming- but not available yet. Yes I know its frustrating. for me and you, but On30 is eating most of my time.

A mounting adapter is available for the excellent ADM indexing unit. If you need an O scale 75ft TT then you have locomotives worth £800-£2000+ each. Do yourself a favour!  - get the ADM turntable drive - you deserve it  -  its the maximum in play value :) Find out more at  ADM TURNTABLES

If you model in the UK then this kit is great for those "northern powerhouse" pacific steamers.  LNER A3's and A4s that ran out of Doncaster, or maybe a LMS Princess from Crewe works, this turntable kit will tick the box for you.

If you model in Germany, and need to turn your beautiful O scale German BR class 50 2-10-0 then this 23m Drehsheibe is just for you!

The kit is a stretched version of my 65ft turntable. It picks up generic features found across the UK, rather than focusing on a particular prototype.

Assembly is straightforward with step by step instructions with many photos. No need for clever solder skills - it really is for the "average" modeller.

This kit is for modellers who want something that will not look out of place and is simple to put together.

 bridge dimensions

75ft (23m) 7mm/ft bridge length = 525mm

bridge track deck width = 47mm

deck width between handrails = 91mm

Pit dimensions:

Outer rim = 558mm

hole required = 548mm

pit depth:  31mm at centre, 25mm at edge

 

Drive train options:-

Hand from heaven!  The most basic turning is hand from above. 100% foolproof, 100% simple.

"El cheapo"  The 0.6rpm motor I released the kit with will turn the bridge just fine with the free-running 28mm wheels. BUT....its a very cheap motor. It has backlash. It has no lock when the motor has stopped. That means the motor will not hold the bridge still. its possible to add some friction at the shaft to hold the bridge in place, but when driving your 4kg loco on and off this 20.5" bridge it is a very big ask. Now I have told you, I will not have to give you the "you get what you pay for" lecture :)  This is why I have removed the cheap motor from the options, but the mounting for it is included in the kit and the motors are available on ebay.

New ABC gearbox and KHM motor.  An ABC/ KHM collabration brings together the expertise of ABC gearbox design with a separate powerful quiet motor. This fine gearbox has almost no backlash and overcomes the problems of "El cheapo". This new gearbox/ motor combination can be ordered separately (only from me), but it is not yet finalised as On30 demand has been pushing it down the track.

GREENWOOD MODEL RAILWAY PRODUCTS. manual motor. Mike Greenwood now has an adapter plate for Kitwood Hill turntables which allows you to use his turntable drive systems. This is based around a stepper motor and 3 toothed belt reduction. I have the manual control version. it is a quality-built ready-assembled unit and runs really smooth. The manual control version is with simple a push button. You will have to order the unit from Mike. (£165 for the manual system as I type this) https://greenwoodmodelrailwayproducts.co.uk/

ADM Indexing system  You "need" this :) I have made an adaptor to allow the turntable to work with ADM indexed O scale drive systems. This is the ultimate experience in turntable operation! I love mine - excellent quality, smooth, quiet and high "play" value!! ADM is the Rolls Royce of the turntable indexing world!  Order the indexing system from Alastair at ADM, (you will need his O scale "Kitwood" variant) and I can supply the mounting adaptor.   See more at   admturntables.com

DCC or DC. Like all KHM turntables can be used with either system. The track power PCB connection rings are continuous so there are no disconnects to DCC decoders with sound as the bridge turns. The contact plungers are 6A rated quality items from the electronics industry. Polarity can be handled with a DCC reversing module or a simple DPDT switch for DC.

Primary shaft turning plate: the heart of all KHM turntables and now proven design. This is a jig-built, ready-assembled item with the 4mm primary shaft, pinned and epoxied into a milled brass section. She ain't slipping!!

Assembly and construction:-

Bridge is made of laser cut ply of various types and thickness with hardwood decking. Glued together with step by step photo instructions. Not hard. Novices have built my turntables!

Bridge track: chairs for code 124 bullhead rail included but the rail is no longer included. Use Peco. ( This is no good for German locomotives. You will need to supply your own taller "Lenz" code 148 rail and chairs .) 

Pit is laser cut 3mm and 4mm ply. Because of the weight of locos it is best to support the turntable from below, rather than the rim (unlike other KHM turntables)

While the kit will make up a whole pit with base , because of the size it is very strongly recommended to fix an additional flat, rigid 9mm ply sheet to the underside to maintain rigidity. This isn't in the kit because that would weigh far too much and be too big to ship!

Ring rail:  Code 100 (included) is soldered to PCB sleepers and a simple jig helps you get it circular and set in the right place. All KHM turntables use the method and its well proven over the years. Its simple, even for novice solderers.

bridge wheels: turned from Delrin on KHM's lathe with ball-race bearings. They are wide enough to be forgiving of "assembly tolerance" of the ring rail.

INSTRUCTIONS ARE NOT PRINTED. This would be high cost, and heavier to ship. This way I can include very many photos. The PDF files are emailed to you when the kit is shipped. If you want to see instructions to help your purchasing decision then I happy to send without obligation. Electrons are free!  Just contact me on the contact page.

 

 

 

 


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Product Reviews

  1. A joy to build 5 Star Review

    Posted by on 27th Jan 2021

    After talking with other Guild members I was recommended to purchase the 65ft turntable kit.
    It was very satisfying to build as the instructions were logical and clear and well illustrated. The precision fit of the parts is amazing
    I am so pleased with the finished result as it not only looks good but is sturdy and functional.


  2. Superb quality kit 5 Star Review

    Posted by on 19th Jan 2021

    I was very impressed by the quality of the components in this kit, how well the design of the kit has been thoroughly thought out and for the excellent fit of the components. It was very enjoyable to build and the finished turntable is very impressive. Highly recommended.