LRS Narrow Planet NPL-008 Assembly Instructions

About the kit
This kit is comprised of a 3D printed plastic body shell, a fret of
etched nickel silver detail parts, a 3D printed brass chassis,
wheels, gears and a motor. Minimal folding of the nickel silver
parts is required and they can all be glued in place. A small
amount of soldering is necessary to complete the electrical
connections. Full assembly instructions are given below.
Due to the nature of the 3D printing process, some support
material may still be present on bottom-facing edges of the body
shell, particularly underneath the buffers. The plastic used has
similar properties to the ABS commonly used in injection-moulded
kits and may be easily cleaned up with a sharp knife and fine
emery boards.
Please note this is a scale model for adult collectors, and not
intended for children under 14 years of age.
Detail Parts • NPL-008 v3.0
1. Large rear panel
2. Small rear panel
3. Brake shoes x 6
4. Assembly spacers x 4
Prototype Info
Introduced in the late 1950s, the
24hp light diesel locomotive was an
upgraded version of the company's
original 21hp model and the smallest
in the range. This model, based on
Hunslet's General Arrangement
Drawing 48937 of April 1961, rep-
resents the basic cabless version.
Many were, however, fitted with
varying designs of cab, and other
equipment, depending upon
intended use.
Preserved examples include
LCWW18, part of the Moseley
Railway Trust collection, and
"Creepy" of the Leighton Buzzard
Railway.
Thank you for purchasing this Narrow Planet kit, we hope you enjoy building and operating it.
Please read through the instructions thoroughly before beginning assembly.
Tools required: Sharp craft knife or scalpel
Razor saw
Tweezers
Flat nosed pliers
Bending bars or engineer's square
Emery paper or boards
Small files
5. Solid side panels x 2
6. Side panels with grille x 2
7. Front grille
Dressmaker's pins or similar
Reamer (suitable for 0.8mm to 2mm)
1mm drill
Loctite 243
Superglue
Soldering iron and solder (solder
paste is recommended)
Carefully remove each part from the fret as required using a
sharp knife on a cutting mat or similar hard surface, and clean up
the tags.
Initial preparation
Carefully remove the sprue containing the filler caps from inside
the body print and put safely to one side. Use a small file to
remove any remaining sprue from the body.
Make sure the chassis fits in the body properly as it will be difficult
to alter after assembly. It should be a tight push fit with the
locating pins on the body fitting between the matching pins on the
chassis. If the two parts don't fit properly then file either the
chassis or body slightly to ensure that they do.
Take the four spacers (4) off the etch and glue or solder them
together in pairs to give yourself two 0.5mm thick parts.
Assembling the Chassis
The layshaft and axles are both notionally 1.5mm in diameter and
the bearing holes have been reamed out to 1.55mm so should be
a smooth fit, but check for burrs on the layshaft ends before fitting
to avoid damaging the bearing surfaces and to ensure that the
brass worms are a sliding fit.
1 • Start by attaching the large pulley to one end of the layshaft
and fixing with Loctite 243 (medium strength threadlocker),
making sure the pulley is square to the shaft. If you need to ream
out the hole do so carefully to make the fit as tight as possible, as
that will help ensure the pulley sits at 90 degrees to the shaft and
doesn't wobble. File any protruding shaft flat to the face of the
pulley as there is minimal clearance within the body shell.
2 • Slide the layshaft into the chassis from the end with the motor
mount. With the pulley pushed flush against the chassis, trim off
any layshaft that protrudes from the other end of the chassis and
file the end flush to the chassis, then remove the layshaft.
3 • Place the two brass worms into the chassis and then slide the
layshaft back into the chassis through both worms. Do not push
the pulley right up to the chassis, but instead use one of the
0.5mm spacers to keep a gap between the pulley and the chassis.