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DIY loco building

a few construction photos

The best of both worlds: massive split frame construction

Let's suppose you are interested to add a certain prototype to your layout. But alas this turns out as not available as r-t-r model or only as unsatisfactory model not suitable for modification. For the latter decision all information is helpful, that includes photos taken under unfavourable conditions of similar loco's.


type 64
The only remaining original NMBS type 64, happily under roof in Treignes.

and drawings of course, leading to:

Why not construct my own chassis kit?



chassis parts
The chassis kit components: a few pieces of metal with some holes at the right place, some wheels bought in the 2mm shop, 2 gears + wormwheel, some screws and a few pieces of plastic plundered from an old loco or directly cut from sheet



Try to get this parallel groove into the rods! there must be alternatives for skrawking by hand in 0.5 mm steel?.


assembled
After spending some time a near complete chassis, assembled and ready for some tests.

Now if you are here wouldn't the rest be easy meat either?

top part component construction


other parts
Start with turning major and minor parts, some less conventional, but nevertheless found on the chosen prototype.

smokebox door
In the mean time solder up some other components, here the smokebox door pieced together, just a further 23 pieces of flat metal soldered into a single unit.

A short note on the current state and why it takes so long. The cab is etched in NS silver and was fitted to the boiler and footplate. Most turnings are ready to put into place when running is satisfying. The simplest of problems to solve was the short created over the Walschaerts rods and the link hanger. This was done by creating insulated eyelets on the connecting rods using some copperclad epoxy board. One of the original wheels was damaged during turning and showed considerable wobble. This required replacing the wheels with new ones. Next testings showed that the loco slipped when running forward. Part of the problem is that the weight with massive boiler was too far forward. Drilling out the smokebox with a 10 mm hole 10 mm deep helped getting the center of gravity closer to the second coupled wheelset. Laying the bogie a tat deeper may solve the slipping entirely as it doesn't slip without bogie. However the gearing chosen seems to give a rather low top speed, changing this for a module 0.3 wormwheel with same diameter will require a total dismantling into parts to get access to the wormwheel axle. The tender frame was replaced with fixed axles of the type with closed bogie sides. This enables to get some weight of the tender onto the back of the loco to enhance the pulling power when necessary.

tender
For its 12th anniversary I made some progress on building a correct tender. The rivet counter will come to 858 and may conclude that some still lack.

There are some 30 pieces of metal shaped up now and it slowly starts to look like a tender. The rivets were impressed with a special tool a similar process as with this tender wrapper here only this time using the CNC mill. This allows higher accuracy, goes faster and can produce smaller rivets. The process took only 12 minutes for 858 imprints. The horizontal rivets are spaced about 7% further apart, this in order to see individual rivets instead of becoming a full line.

combination Testing the combination, the tender looks to sit a bit low here, the loco body dusted off, all loose items failing, most of them sit somewhere in a box (hopefully).