Monthly Archives: August 2013
Whilst my orders for earlier work are underway, I have done a bit more drawing and have now drafted up some lamps for the signals; as below:
I have also managed to sort out a drawing that I did some time ago for a water column. The larger of the models for 3 D printing need to be hollowed out (to save on the printing medium, which is charged for by its volume). This took some time to get right, as I had multiple different parts I was working on.
So these have also be sent of to Shapeways for printing. As before, I will use the lamps as masters for lost wax casting (another new trick to learn!) but the water column will be used as a master for some resin casting (the old dog really is going for lots of new tricks) – it will also need an etch for its operating arm.
However, lets see how good they come back first – as I think I am probably counting chickens prematurely here……….
I received the test etch back from the etchers and after a family holiday (Lisbon – hot but great and with fab trams – see below………) I have had a chance to look at it.
I still have some things to learn, as where I have drawn things up at 4mm the smaller elements have come out a bit fine. so things like the framing around spectacle plates or the cross to the centre of the brackets is a bit too delicate to use. Also, I made a number of the fold lines and the holes are a bit too small so need to be drilled out. Thus, whilst the 4mm ones are usable, they can be done better so I am going to edit the etch.
I also included the signal arms etch at 7mm and this is much better. Whilst one or two elements would benefit from a slight redraft, it is definitely usable and therefore I am just in the process of some 7mm modelling (excommunication from the Scalefour Society?). I’ll get some posts up when I can get it a bit further.
In the meantime, I have also managed to have a bash at some 3-D modelling on CAD to get some finials made up. The idea will be to do an initial set via 3-D printing and then to use these to make some lost wax castings. Whilst these are available via MSE as a whitemetal casting, they are very delicate and will last very little time in my clumsy mits. I will do a lamp via the same route for the same reason.
Anyway, this is what the 3-D model looks like (actually the final version has a sprue coming of the top to support the top of the finial but it rather blocks out what it is you are looking at):
And to give a flavour of the trams in Lisbon: