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The Current Project
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Gallery-06 - P3 Alfa Romeo

The final assembly of the P3 Alfa Romeo started last month with

the engine into the chassis.  All of the parts are assembled with

tiny brass bolts provided with hexagon heads.  These I prefer to

make for myself, as with the BA sizes that I use, the standard

hexagon head for a given size of screw, is much larger than one

would expect to see, for scale size.

Screws I normally buy as long as possible, so that threads can

be cut down to the required length for the given job in hand. 

The excess thread I keep to use as studs, or for locking parts in

place, then cutting off the surplus flush.  Regarding the hexagon

heads, I order the screws with cheese heads, then fill the screw

driver slot with soft or hard solder, and file the round head into

a hexagon.  With a little practice this can be accomplished  with

out a problem, by holding the screw in a pair of pliers by the thread,

then putting a small flats on opposite sides of the head, followed by two further small flats on each side of those, making six in all.  With a small chamfer around the top of the head, and you now have a more realistic scale bolt head.  Bolts for final fixing and assembly will have threads sizes as large as possible to do the job in hand. If the standard heads are not modified they will be out of scale.  As also the standard nuts for a given size of thread .  I have always used the British BA even numbered sizes for nuts and bolts - 4BA - 6BA - 8BA - 10BA - 12BA - 14BA & 16BA.  To have the maximum size of thread and the minimum size of Hexagon nut, I take the next size of nut smaller than the bolt thread that I have chosen, and re-tap with the larger thread size.  So for an 8BA bolt, I will use a 10BA nut and re-tapped 8BA. It so happens that the tapping and clearance drills for the above set run consecutively - The tapping drill for one, is also the clearance drill for the next, which is very convenient.

For items such as the hood spring catches I use Nickel Silver rather than Brass, for two reasons.  Firstly it is much stronger than the brass, so is idea for small working parts.  Secondly it can be polished to a suitable bright silver finish so does not need to be plated.  Plating in the 1930’s would have more likely been in Nickel rather than Chrome anyway.  Also to Chrome plate such minute items it to make them brittle and liable to brake if used as a moving part such as a hood catch.


For those looking for more information on the construction of the Falls of Clyde, I am running a ‘Log’ on the building of it on the ‘Model Ship World’ web site.

Check out < > and search for ‘Falls of Clyde’

Most of the photos will  be the same as here, but there will I hope be more insight into the actual working of the materials and building of the model.

Four photos are added at the start of each month and relevant text on the building.  It should be running for a considerable time to come, and hopefully will not repeat what I have here too much.