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LNWR axleboxes and springs for 10-ton wagons 3d printed

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Smooth Fine Detail Plastic
LNWR axleboxes and springs for 10-ton wagons 3d printed
LNWR axleboxes and springs for 10-ton wagons 3d printed

DIGITAL PREVIEW
Not a Photo

LNWR axleboxes and springs for 10-ton wagons

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Product Description
Axleboxes with springs and spring-shoes for LNWR wagons rated at 10 tons load: enough parts for four or five wagons, depending on configuration.

The axleboxes are LNWR no.2 grease boxes, as fitted to wagons rated for 10 tons load (and downrated to 6 tons load at the ends of their service). Wagons with these fittings were mainly built in the last 10 years of the 19th century and the first 10 years of the 20th century. Earlier wagons more typically axle boxes and springs for 7 tons load (see separate product in this shop), and later wagons often had different axleboxes with oil lubrication.

Eight-leaf springs are included, of length 38.5" between spring shoes. This dimension is not given in the available text and had to was scaled from GA drawing, which give various values between 37.7" and 42"; 38.5" is the mode.

Spring shoes are of two kinds, to cover different configurations of brake gear. In each row of five assemblies, four have plain shoes and one has a shoe combined with a trunnion for the brake shaft. The trunnion merged with the shoe applies to direct-acting single-shoe brakes (both iron and wooden blocks) when the brake shaft is close to the wheel. For double-block and push-rod brakes, the assemblies with plain shoes should be used on all wheels. Therefore, with the 20 assemblies provided, one can equip four wagons with push-rod brakes or four with direct brakes and one with push-rod brakes.

These models are drawn using information in LNWR wagons vol. 1,  by the L&NWR Society, ed. C. Northridge, pub.  Wild Swan.

Instructions for use
Please take care in cutting the parts from the sprue as the resin is quite fragile. Sharp side-cutters or dedicated sprue-cutters are best, but the sprue can be cut safely with a knife if properly supported. I use Tamiya sprue-cutters which are excellent. The parts are weakest where the springs meet the shoes, so take special care not to put a load these areas.

Cut the residual sprue from the back of the axlebox and sand or file flush with the back of the print. The plate at the back of the box, representing the part of the casting that engaged with the axleguard, is thicker than scale: you may could try to sand this down nearer to scale, but it's probably OK visually as printed.

In 4mm scale, the axleboxes are modelled to accommodate waisted, pinpoint bearings. You will need to file down the pip on the tip of each bearing to get clearance.

To fix the parts to the wagon, I suggest cyanoacrylate glue. My preferred approach is initially to glue an assembly to the solebar by its spring shoes, then to fix the back-plate to the axleguard by introducing a very little amount of glue along the vertical edges of the plate. This approach favours sprung axleguards and minimizes the chance of gluing up the mechanism.
 
Details
What's in the box:
LNWR-10-ton-wagon-axleboxes-springs-4mm
Dimensions:
3.18 x 9.43 x 0.39 cm
Switch to inches
1.25 x 3.71 x 0.15 inches
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Rating:
Mature audiences only.
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