Saturday, 15 May 2010

Dial marker blank

So the question was, what do I do with the broken winding shaft? The silver steel is not very expensive. It's just that I have to get it from the UK, since I have been unable to find steel suitable for watch work here in India. I hate wasting even a millimetre.I decided to make an experimental dial marker out of the broken piece. Last week I made 8 marker blanks with a 1.5 mm head (No.1-01 has 1.5mm dial markers). Here they are. They are swimming in oil because I wont need them till the dial and dial plates are ready. Untreated silver steel tends to rust in Pune climate.
Today I decided to try a 1.3mm head. Since I turn between centres (on the turns), the first thing to do was to form a new cone on the end of the broken piece. The three pictures below show how this is done.

Once you have cones on both ends of the job, you can turn between two female centres. Below you can see that the shaft of the dial marker has been turned.
After this I prefer to start the parting cut & only then reduce the head to the correct size. The under side of the head needs special attention. I make it slightly concave to ensure that the marker sits on the dial true & flat.
After everything is done the dial marker blank is cut off with a saw.

This marker blank will be finalised after the dial is ready. Please note that it is still soft.

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