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Turntables

Diamond Scale Products designs and manufactures complete operating turntable kits in several scales and with several different bridge lengths.  They are designed to be realistic in appearance and to provide excellent operating characteristics.  The kits are craftsman-type and have numerous fine details included in metal castings, plastic moldings, and basswood scale wood.  The turntables are designed to be installed from beneath a layout through a circular hole.  All turntable kits come standard with the following features:

>Factory-cast pit; pit walls with ring rail ties are Hydrocal, directly cast onto a composition wood base.

>Gear and bearing housing is factory drilled and assembled to the underside of the pit.

>5/16 inch diameter steel center shaft (7/16 inch diameter for O-scale turntables).

>3/16 inch diameter worm shaft.

>5/16 and 3/16 inch (ID) steel shaft collars and bronze oil-filled flange bushings.

>7/16 inch and 3/16 inch (ID) for O-scale turntables.

>Non-wearing plastic main and worm gear; 50:1 gear ratio. (Brass main and steel worm in O-scale)

>Weathered nickel-silver ring rail; rail glues to step in cast pit ties.

>Scale bridge ties, scale basswood catwalks and other details.

>Removable bridge assembly to facilitate cleaning and maintenance.

>Complete instructions with diagrams, parts list, and templates.

>Further details about each style of kit are noted separately.

>You determine how you will turn or power the turntable.  You can:

If you plan to turn the turntable manually or with a motor unit, the alignment of the track rails is by eye.  The turntable should be located within arm’s length from the edge of the bench-work.  This is a good practice not only for correcting possible derailments but also it is about the maximum distance a person with 20/20 vision can line up the tracks.

Indexing can be added to make the bridge rotate automatically to a selected track location.  The Diamond Scale Products indexing does not require using fixed angle increments and can have sensors located wherever desired around the circular pit.  Its solid state system senses when the bridge is close to a track that has been selected and slows the motor drive.  It then stops the motor drive when final alignment is obtained.  Accuracy of 1/50 inch at rail ends can be achieved.


Diamond Scale Products turntables are available in five different styles in various scales and nominal bridge lengths.

Large Girder (Twin-span)

HO-scale: TS-090, 90 foot;  TS-120, 120 foot;  TS-134, 134 foot

O-scale: OT-080, 80 foot;  OT-105, 105 foot;  OT-130, 130 foot
(O-scale turntables and HO TS-105 are currently unavailable.)

N-scale:  NT-100, 100 foot;  NT-135, 135 foot

Steel Truss (Thru-truss)

HO-scale:  ST-090, 90 foot;  ST-115, 115 foot;  ST-135, 135 foot

Small Girder

HO-scale:  SS-065, 65 foot;  SS-075, 75 foot

Sn3-scale:  SN-065, 65 Foot

Timber Truss

HO-scale:  TT-051, 51 foot;  TT-060, 60 foot

Gallows Truss

HO-scale:  GT-056, 56 foot

A table of approximate dimensions of all turntables has been provided for planning purposes

KIT NUMBER STYLE TURNTABLE BRIDGE RAIL PIT DIAMETER * PIT WALL WOOD PIT BASE
    (Scale feet) (Length; inches) (Outside; inches) (height; inches) (L x W x H; inches)
TS-090 Large Girder 90 foot 12-1/2 14-1/8 1-1/16 16 1/2 x 16 1/2 x 1/2
TS-105 Large Girder 105 foot 14-5/8 15-9/16 1-1/16 16 1/2 x 16 1/2 x 1/2
TS-120 Large Girder 120 foot 16-1/2 17-7/8 1-1/16 20 1/2 x 20 1/2 x 1/2
TS-134 Large Girder 134 foot 18-1/2 19-13/16 1-1/16 20 1/2 x 20 1/2 x 1/2
ST-090 Steel Truss 90 foot 12-1/2 13-9/16 15/16 16 1/2 x 16 1/2 x 1/2
ST-115 Steel Truss 115 foot 16 17-3/16 15/16 20 1/2 x 20 1/2 x 1/2
ST-135 Steel Truss 135 foot 18-13/16 20 15/16 20 1/2 x 20 1/2 x 1/2
SS-065 Small Girder 65 foot 8-7/8 9-15/16 13/16 12 x 12 x 3/8
SS-075 Small Girder 75 foot 10-3/16 11-9/16 13/16 12 x 12 x 3/8
TT-051 Timber Truss 51 foot 7-1/4 9-1/2 1 12 x 12 x 3/8
TT-060 Timber Truss 60 foot 8-1/4 9-11/16 1 12 x 12 x 3/8
GT-056 Gallows Truss 56 foot 7-5/8 9 9/16 12 x 12 x 3/8
NT-100 Girder 100 foot 7-1/2 8-1/2 9/16 12 x 12 x 3/8
NT-135 Girder 135 foot 10 11-1/8 9/16 12 x 12 x 3/8
SN-065 Girder 65 foot 12-1/8 13-1/8 1 16-1/2 x 16-1/2 x 1/2
OT-080 Girder 80 foot 21-3/4 24 2 28 1/2 x 28 1/2 x 1/2
OT-105 Girder 105 foot 26-1/4 28-7/16 2 28 1/2 x 28 1/2 x 1/2
OT-130 Girder 130 foot 32-1/2 34-3/4 2 37 x 37 x 1/2 **

* Dimensions shown are typical; actual may vary by +/- 1/16 inch
** After assembly


Additional details about the HO-scale turntable kits


Large Girder (Twin-span) Turntable Kit

Available in nominal bridge lengths of 90, 105, 120, and 134 scale feet.

Bridge frame consists of two basswood sides separated by spacer blocks and center block.  The center block is plastic molded to receive the center shaft.  Girder ribbing and rivet detail is provided by plastic molded side pieces.  Ring rail trucks are metal castings with brass wheels and steel axles, complete with motor and gear detail.  Bridge control cab and round-top bridge arch consist of metal castings to be glued together. 


[Photo of TS-134]


Steel Truss (Thru-truss) Turntable Kit

Available in nominal bridge lengths of 90, 115, and 135 scale feet.

Bridge posts and diagonals are metal castings with web and rivet detail.  Bridge is constructed from scale basswood shapes and 1/64 inch thick plywood that make gussets and cross-ribs.  Center shaft has factory-welded steel out-reach arms to apply turning pressure close to the bridge ends.  Bridge cab and arch consist mainly of metal castings to be glued together.  Ring rail trucks are metal castings with brass wheels and steel axles.


[Photo of ST-135]


Small Girder Turntable Kit

Available in nominal bridge lengths of 65 and 75 scale feet.

Bridge frame consists of two basswood sides separated by spacer blocks and center block.  The center block is drilled to receive the center shaft.  Ring rail trucks are metal castings with brass wheels and steel axles.  Center arch is code 70 weathered nickel-silver rail with fine metal guy wires.  Girder ribbing and rivet detail is provided by plastic molded side pieces.  An operating platform and motor mechanism is provided in metal castings.

 
[Photo of SS-075]


Wood Timber Truss Turntable Kit

Available in nominal bridge lengths of 51 and 60 scale feet.

Bridge is constructed of scale basswood.  Center shaft is factory-welded to a steel plate that attaches to the bridge. Nut, bolt and washer detail provided by plastic castings.  Pit walls provide a rock texture appearance.  Center pivot features a metal casting cone.  Electrical pick-up for the bridge is by slip ring and wiper mounted under the bridge.  This turntable kit is quite suitable for dual gauge and Hon3 narrow gauge.

 
[Photo of TT-060]


Wood Gallows Truss Turntable Kit

Available in nominal bridge length of 56 scale feet.

Bridge is constructed of scale basswood.  Center shaft is factory-welded to a steel plate that attaches to the bridge.  Arch is scale basswood with thread guy wires.  Nut, bolt and washer detail provided by plastic castings.  Pit walls simulate stacked ties.  Center pivot features wood and metal support structure.  Electrical pick-up for the bridge is by slip ring and wiper mounted under the bridge.  This turntable kit is quite suitable for dual gauge and Hon3 narrow gauge. 

 
[Photo of GT-056]


Additional details about the O-scale turntable kits

Large Girder (Twin-span) Turntable Kit

Available in nominal bridge lengths of 80, 105, and 130 scale feet.

>7/16 inch diameter center shaft factory-welded to a steel support arm.

>100 tooth brass/bronze main gear.

>Single pitch steel worm gear.

>Center block, gears, and main shaft are pre-assembled.

>Bronze oil-filled flange bushings and steel shaft collars.

>Dolly trucks fitted with steel axles and bearing wheels; complete with motor and gear detail.

 All O-scale kits may be furnished with 1/32 inch thick plywood decking in place of ties so that two or three rail track my be placed directly onto the bridge deck; thinner ties are then provided to support the walkways and handrails.

The OT-130 pit is made and shipped in two sections to better accommodate shipping and handling.  Full instructions and additional materials are provided with the kit to join the sections together.

 
[Photo of OT-130]



[Photo of OT-105]


 
[Photo of O-Scale Arch]



[Photo of O-Scale Control Cab]



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Last updated August 23, 2007