Brass and wood not included. No hole is provided for securing a chain.
7/8" Scale Dinorwic Point Lever Base & Pivot
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Product Description
A point lever base and drive beam pivot casting for a Dinorwic Quarry stub or Fothergill turnout in 7/8" scale (1:13.7), also known as SE or 7/8n2 scale.
The sprue includes three parts: two halves of the lever base and the pivot casting for the crossing drive beam.
The lever base halves have alignment pins (you may need to open the holes out to 2 mm using a drill bit held in your fingers) and are designed to be glued together, after fitting the lever mechanism in one side. The lever pivot holes are nominally 2.5 mm diameter, which are intended for 2.5 mm x 0.225 mm brass tube inserts, with 2 mm rod used for the lever pivot. The holes are 3 mm deep.
There are four 3 mm diameter spigots on the underside for securely locating the base on a sleeper or whatever you will, at 30 mm and 15 mm centres.
There are two pairs of nominally 0.7 mm diameter holes in the quadrant flanges, although these are likely to be printed undersize or only appear as indentations. If you want to use them, you can locate the indentations with a scriber and push it through to make holes, then open them up with a drill bit. These were for a pin that appears to have passed through the point lever, securing it in position. The pin was kept on a chain secured to a washer beneath the pivot pin nut. I have not seen any photographs showing the pin being used, but there is one showing the pin lying on the ground at the end of its chain. In practice, opening the holes out to 0.8 mm, drilling a 1.0 mm hole in the point lever and using 0.7 brass rod for a pin works well.
The crossing drive beam pivot has a 2 mm diameter hole running through it, for a 2 mm rivet to act as a pivot pin, but it can be drilled out to a larger size such as 3/32" or even 1/8" if you prefer. On the underside there is a 6 mm diameter boss concentric with the pivot pin, and a 3 mm diameter location spigot, at 10 mm centres.
The usual arrangement was to have the point lever in line with the switch stub ends and use a long flat bar pivoted near the middle to drive the crossing, but at least one turnout had the lever parallel to the track where the flat bar pivot usually is, and used rods and angle cranks to both the switches and the crossing. Crank pivots appear to use the same casting as beam pivots (but two pivot castings are needed for rod and crank operation). Note that it is likely that the switch rails will need greater travel than the crossing rail, in which case the beam pivot should be closer to the crossing, rather than being half-way along the beam.
Dimensions of lever base when assembled:
Length: 44.4 mm
Width: 24.2 mm
Height excluding location spigots: 27 mm
Height of pivot centre: 14.5 mm
Dimensions of pivot casting:
Base: 22.2 mm x 18.5 mm
Height from underside of base: 7 mm
Overall height: 10.5 mm
The sprue includes three parts: two halves of the lever base and the pivot casting for the crossing drive beam.
The lever base halves have alignment pins (you may need to open the holes out to 2 mm using a drill bit held in your fingers) and are designed to be glued together, after fitting the lever mechanism in one side. The lever pivot holes are nominally 2.5 mm diameter, which are intended for 2.5 mm x 0.225 mm brass tube inserts, with 2 mm rod used for the lever pivot. The holes are 3 mm deep.
There are four 3 mm diameter spigots on the underside for securely locating the base on a sleeper or whatever you will, at 30 mm and 15 mm centres.
There are two pairs of nominally 0.7 mm diameter holes in the quadrant flanges, although these are likely to be printed undersize or only appear as indentations. If you want to use them, you can locate the indentations with a scriber and push it through to make holes, then open them up with a drill bit. These were for a pin that appears to have passed through the point lever, securing it in position. The pin was kept on a chain secured to a washer beneath the pivot pin nut. I have not seen any photographs showing the pin being used, but there is one showing the pin lying on the ground at the end of its chain. In practice, opening the holes out to 0.8 mm, drilling a 1.0 mm hole in the point lever and using 0.7 brass rod for a pin works well.
The crossing drive beam pivot has a 2 mm diameter hole running through it, for a 2 mm rivet to act as a pivot pin, but it can be drilled out to a larger size such as 3/32" or even 1/8" if you prefer. On the underside there is a 6 mm diameter boss concentric with the pivot pin, and a 3 mm diameter location spigot, at 10 mm centres.
The usual arrangement was to have the point lever in line with the switch stub ends and use a long flat bar pivoted near the middle to drive the crossing, but at least one turnout had the lever parallel to the track where the flat bar pivot usually is, and used rods and angle cranks to both the switches and the crossing. Crank pivots appear to use the same casting as beam pivots (but two pivot castings are needed for rod and crank operation). Note that it is likely that the switch rails will need greater travel than the crossing rail, in which case the beam pivot should be closer to the crossing, rather than being half-way along the beam.
Dimensions of lever base when assembled:
Length: 44.4 mm
Width: 24.2 mm
Height excluding location spigots: 27 mm
Height of pivot centre: 14.5 mm
Dimensions of pivot casting:
Base: 22.2 mm x 18.5 mm
Height from underside of base: 7 mm
Overall height: 10.5 mm
Details
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Lever Base Public
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