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7mm/ft O scale 75ft turntable

  • O scale 75ft (23m) turntable. 7mm/ft. motorised.
  • 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 code125 rail and chairs look great. simple jig centres the rails
  • 28mm delrin wheels with ball race bearings give smooth ride with minimal friction
  • "Big Worm" 0.6rpm motor has plenty off grunt.  Tested up to 4kg weight across the bridge.
Price:
£125. kit will be available to order in August 2019, bit Only after I release it. until then there is no cart!
SKU:
KHT770
Scale:
Maximum Purchase:
1 unit(s)


Product Description

75ft (23m) O scale (7mm/ft scale) turntable kit.

Kit is due for release in August 2019. Nearly done but not yet!

This complete motorised kit is great for turning your large O scale locos.

 

If you model in the UK then its great for those "northern powerhouse" 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 I have stretched this turntable to 23m (75ft) just for you!

 

The kit is a stretched version of our 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. Kit comes complete with motor and all the needed electrical contacts.

Purists beware! This kit is for modellers who want something that will not look out of place, is simple to put together, and who want to "play trains" without spending a fortune.

If counting rivets is your thing this turntable kit is not for you. It you are the sort of modeller that knows the Doncaster bridge was 70ft long, and the pit was deeper than this kit, and the compromise would always irk you, then this kit is not for you. I have to use common parts - and the concave pit base of Doncaster's TT would be a devil of a job!

 

 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!  In most basic form of the kit turning is hand from above using the push poles. the motor can be removed as an option.

Motor power "Big worm" 0.6rpm motor works just great with the 28mm wheels.

Indexing in future?  not planned. clever and inventive modellers could DIY something  - but if the drive is slow enough, and you can see to align, indexing isn't needed. There is a reason DCC indexed turntables cost an arm and a leg - especially ones that can turn 4kg of loco.

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: I offer C&L chairs and code 124 bullhead rail as an option that will match Peco. Otherwise you can supply your own which is the default selection when ordering.

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 surface 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 82 (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 last years. Its simple, even for novice solderers - honest.

bridge wheels: turned from Delrin on KHM's lathe with ball-race bearings. the same method as the 48ft turntable but with a larger 28mm diameter. 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 by email at sales@kitwoodhillmodels.com.

 

 

 

 


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