Contents
Prototype Frame Horns Axle boxes Wheels Axle Crankpin Coupling rod Connecting rod Return crank Crosshead Valve simulation
Introduction
I joined the Norwegian Model Engineer Association to get help with practical engineering as a
retirement activity. Another club member invited me to build a model of the NSB (Norwegian State
Railway) Type 23 steam locomotive in 1/8 scale for a 7 1/4" gauge miniature railway together with him.
Some drawings and other material arising from this on-going project are presented here.
Dimensions in the drawings are in millimetres.
Laser cut pieces of frame for M23 in 3 mm steel from JM InduTech AB, Lycksele, Sweden in 2017.
Gaining practice with tools & locomotives in 2018.
AJ Reeves for "Hermes" in 2017.
Drawing of axle horns for M23.
Initial machining of horns for M23 in 2018.
Final machining of horns in place in frames in 2019.
Boring axle box for M23 in 2019 (early version with too small diameter in back).
Blackgates , "Holmeside," in 2018.
Drawing of driving and coupled wheels for M23 (without balancing weights).
Reaming axle hole from back of the wheel for M23 in 2019.
Jig (from gauge plate) for locating crank hole and keyways in wheels of M23 in 2021.
Heating key jig prior to quenching in oil in 2021.
Broaching keyway in wheel using a hydraulic press in 2021.
Milling keyway in axle in 2021 (V-blocks enable 90 deg. rotation for other end of axle).
Test fit of axle in 2021 - press fit in roller bearing is too tight.
Drawing of coupling pin for M23 (with bearing for coupling rod and retaining washer).
Squaring 25x8 BMS blank for coupling rod for M23.
Reaming hole for crankpin in coupling rod for M23.
Radiusinging end of coupling rod for M23.
Sawing off excess material from coupling rod for M23.
First attempt at front coupling rod for M23 in 2022.
Attempting to part off axle steel in the lathe ---> broken part off blades.
Parting off Colphos 90 successfully with inverted blade & reversed rotation.
Trial fit of coupling rod on wheel.
Failed insulation in my milling machines motor, July 2022; extracting primary gear.
Cutting a circlip groove on the brushless replacement motor (Qiwo QW80BL007 High Speed 220V 6000rpm 1kw).
Drawing of adaptor plate to fit replacement motor onto milling machine.
Replacement motor installed on milling machine.
Control box and replacement motor on milling machine.
Trial version of return crank for M23 (with fixtures for machining).
"Loco" - Simulation of Walschaerts Valve Gear (size 1.4MB) This is just the documentation of a program I wrote for valve gear simulation, not the actual program.
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