Movement Exchange Sunday, Apr 24 2011 


In September 2010 a work colleague was lucky enough to find a source in Switzerland of “watch kits” using the ETA 6498 movements, these kits usually come with a case, dial, hands and movement in the grade of your choice, while I would have preferred not to, I still had not found a movement available locally cheap enough or in a quantity sufficient to practice movement plate making on (the Vulcain 90 movement I obtained and measured is really too good to work on in the hope it all works the first time) so I placed an order for 4 of the base level of movement, reasoning that once I have plates that work, I can upgrade to the top grade at a later point for the better hairspring, balance and escapement (and throw away the decorated plates). Even for these 4 movements it cost the same as it would have to obtain 1 locally!

Unitas/ETA 6497

I set about measuring all of these components (getting good at this bit 🙂    ) and re-drawing them in a basic form in the computer, to rearrange their layout into the barrel shaped movement I had planned out earlier.

In December 2010 I discovered that I would be sent to Switzerland early in 2011, and reasoned that it would be good if I had a nice watch to wear while over there, I also found out that I would miss the SIHH/GTE 2011 by arriving a few weeks after it finished, and miss Baselworld 2011 by leaving a few weeks before it would start.. Doh!

With a firm deadline now on the cards, I started fine-tuning my design, was about half way through, then realised there was no way that I would be able to obtain a glass for the front of a barrel shaped case in the timeframe available (the parts supply outlets that I would use are closed over Christmas / early January and with any sort of lead time it would be marginal at best). To this end I started re-designing the movement to fit a round case, using a variant on the bridge design that I prefer (called the Batman bridge by more than a few now)

Bridge Layout... Nana nana nana Batman!

On the 28th of December, I finished the layout of the movement (during the Christmas / New Year break), and started programming the machining to be done on my mill.

Movement Layout re-organised

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Dial Experimentation – Safe Enamelling Sunday, Apr 17 2011 

The “Harlequin” type design I would like to try in a number of ways, my initial thoughts were to make it using “cloisonne” style enamelling where the diamond pattern would be laid out on a flat base, using small pieces of wire to make the closed cells which are then filled with the enamel colour and fired.

Another similar method is to use my milling machine to cut the cells out of a solid plate, which will be less fiddly for me (and give me faster results while I learn) though the borders between each cell will be a bit thicker, so the design will not be as refined.

Milling out Diamonds.. much easier than the alternative...

A 3rd idea I had was to use the Plique a Jour method of enamelling, where the design is cut completely through, and using transparent enamels, whatever is behind the dial will be visible.

The basic technique is the same for all of these. (though I haven’t tried proper cloisonne yet)

Cut out the design needed in copper plate on the milling machine

Copper plate milled for enamelling (already looks pretty good...)

Fill the cells with a mixture of enamel powder (ground glass of a special composition to ensure even expansion) and purified water

Wet Enamel (Transparent) on a copper base

Allow the cells to dry

Cells filled, waiting to be fired in the oven

Fire until the powder fuses into a glass, and fixes to the metal

Allow to cool

At this stage the object would be cleaned, the enamel re-applied and re-fired until the desired effect was reached. In my case as these were all test pieces, I left them at this stage to explore more techniques

As I am quite fond of luminous material as well, I thought I would try doing a semi-enamel technique as well, to be used later with carbon fiber sheet, for this I used what is commonly called a “soft enamel”, really a 2 part resin, that has a hardness that is closer to enamel than most plastics, though I still would not trust it for use in an external area of a watch case.

Plastic, cut out to take luminous material

Plastic cut in Diamond Pattern to take Luminous Material

The product I’m using is called ceramit, the only problem that occurred was that the material I wanted to test has a melting point quite close to the heat required to cure the resin.. so I used more copper instead 🙂

The big advantages of using this product is that it provides a consistent result with little problems, no incredibly hot pieces of glass and metal (a small electric toaster oven is sufficient for curing), can be used on previously finished pieces quite easily, and the luminous material mixes in quite easily as well. There is also less finishing required and the material can be applied quite thinly, easily, whereas for normal enamel this can be very hit and miss to achieve.

Disadvantages are that it is softer than “real” enamel, so can’t be used on external pieces, and is not regarded as real enamelling (rightly so, as the skill required is no where near)

Being much faster to apply also means I can test more pieces faster, see if a design works, then (once I learn enamelling properly) make a “real” version

Test Piece of enamel powder on copper - dry

Test Piece fired, lots more practice needed...

Dial Concepts Monday, Apr 11 2011 


During early 2010 I started to do some experimentation with dial manufacture techniques, there are a number of dial designs that I know I want to produce, and what I want the finished product to look like, but knew I needed to at least test a few different methods of achieving these.

Bold, practical

This design has inspiration from pilots watches, I would make this from a white enamel base, with the markers being solid metal with the minute markers polished, and the 5-minute markers covered with luminous material.

I think this will also work with a black base (though with light numerals at the 3,6,9 & 12) as a more traditional pilots-type watch, and would be quite neat if cut from carbon fibre sheet with the metal and luminous inlayed.

Masque Dial

This design I would like to do in a range of materials and schemes,

The most complex being with the diamond pattern done in transparent enamels, so you can see movement parts through the dial, and the mask being carved from gold and held in place over the dial. The more simple versions could be done in two colours or tones and with or without the mask.

I knew that dial designs I want to make will need enamelling, so as far back as 2003 I knew that I would have to learn this technique at some stage, to this end I bought from a colleague a small furnace and some basic enamelling supplies, unfortunately before moving to our current abode there was not a space where I could safely fire up a small metal box to the temperatures required, the garage in our current house is such a place, nice high ceiling, concrete floor in case I happen to drop hot metal or molten glass (very important)

Toaster... at 800 degrees Celcius

As is normal with these sort of things, design is much easier than manufacture, as will be seen in the next post…

Workshop Relocation & Milling Machine Repair Wednesday, Apr 6 2011 

Not much work was done on my watch or movement in early 2010, as I was relocating my workshop from the garage to a spare room in the house, which meant changing the floor from carpet to a floating wooden floor (I’ve tried a carpeted workshop before, not much fun when something goes “sproing”) then moving all of my tools, benches etc..

Original Workshop, Out in the shed

The main reason for this move was that during the previous year, I had noticed an increasing amount of condensation and moisture in the garage, this was especially noticeable on the steel tools I had siting on my bench/shelves etc. Cleaning the rust and other damage to the tools affected left me more annoyed than inspired to do more than a few basic tasks on watches for most of the early part of 2010, and then winter came.

New workshop

The most important tool I have at the moment for the manufacture of many of the pieces I need to make is my small CNC milling machine, in the winter of 2010 I was checking the state of our garage, and noticed a puddle had formed on the workbench next to my milling machine, and then I noticed that the motor and spindle of the milling machine also appeared damp, knowing enough about electrical safety not to do too many stupid things, I unplugged the mill and inspected the electronic speed control, which proceeded to pour out some nice brownish water! Not what I wanted to find.

After some verification with the manufacturer, and a small insurance claim, by late 2010 I relocated the mill (along with anything else that I had left behind previously) to my already cramped workroom,

Fully Loaded Workshop 1

Fully Loaded Workshop 2

 

Not much room spare, but I can do pretty much everything I need to so far.. Not sure if I can fit a Schaublin 70 in here though (Not that it is likely I’ll need to try in the immediate future)

Anything I deemed that was really too messy for the workshop was left in the garage (though out of spots where it would get wet) or on the kitchen table, things like enamelling tools or substances.

Through the Looking Glass… errr Microscope… Sunday, Apr 3 2011 

Whoops, long time since an update, and a lot has happened in the last 14 months, so this will be broken up in to multiple posts for everyones (including mine) sanity.

Microscope

Microscope

Microscope

I succeeded in procuring my toolmakers microscope, with it arriving shortly before Christmas 2009, the only issues I have with it after a number of uses, are that it measures in imperial increments, so conversion to metric is needed, and due to the number of measurements needed, the opportunity for errors is increased, also it has only the one set of optics, and the magnification is possibly a little excessive.

View of a Jewel through the Microscope

The scale in the picture is one graduation equals approximately 1/100 of a mm