Dial making Pt.5

Steel-made index. After processing at lathe, hour and minute points were made. I drilled 60 holes one by one with rotary table.

I will ink in these holes before case assembling.

Dial making Pt.4

I made the bridge for holding the jumping hour wheel.  Drilled some holes for processing guide.

I milled it carefully...

After sand-blasted, chamfered the edge and polished.

Dial making Pt.3

Fix the dial on the board with a handle.

I use garnet sand. Commonly it will be used as bottom sand for raising tropical fish.

I drop sand to the dial from above. Yes, this is very simple way. But it is effective.

After six times sand blasting. It will be enough.

I polished up the chamfered part with sandpaper and diamond paste.
Brass base part of the dial was completed.

Dial making Pt.2

Sandpaper the surface. No need to make the mirror surface. 

Fix it to the jig and start cutting.

Chamfer the edge at 45 degrees.

Applied perlage pattern to the surface.

This is preparation for sand blasting.

Making the Dial of Jumping Hour

I tend to produce another version of the dial for jumping-hour model.
Using brass mainly, blue-steel hands will be fitted for more classical(?) looking.

Working at compact milling machine with rotary table.
Centering...

Making from 1.2mm thick brass plate.

Drilling some holes for fixing screws and etc.

Cutting the outline and step for index parts.

 

The blue circle shows a failure point. However, it is correctable. It was just going to start again from beginning. It was close...

It was cut off by coping saw. Vallorbe saw has very sharp blade and easy.

Fix the failure part...

Applying 'Perlage' circular decoration pattern by using rubber bonded wheel. The tip diameter is 1.5mm.

I changed the jig and applied it on the center part too.

Finished in this way.

IL020 Jumping Hour Watch

Here is the specification.

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WIDTH : 40mm
HEIGHT : 10.8mm
LUG to LUG : 49mm
LUG WIDTH : 22mm

CASE : Stainless steel
MOVEMENT : Swiss ETA2801 + Handmade jumping hour module
CRYSTAL : Sapphire

DIAL : Brass and Blue-steel
HANDS : Polished steel
*********************************************************************************
PRICE : -under consideration-


Generally jumping-hour model has a disk-dial. But I wanted the appearance unlike a general one.

When the minute hand rotated in one hour, the hour hand jump to next hour marker quickly.
The jumping action is caused by linkage of three star-wheels and one push wheel. They are controlled by spring levers. I had a hard time to decide the strength of the spring.

I chose ETA2801 hand-winding as a base movement, because I wanted to build this model as thinly as possible. The jumping-hour module needs a certain thickness. When automatic mov is adopted, the stainless case will thicken more than 1.xxmm.  The difference is huge, I suppose.
(The movement in this photo is temporary. Its decoration is going to be changed...)
Brass inner holder has 'Pelrage'.

Polished steel hands, wheels, jumpers were made by my hand. Dial is composed from sand-blast finished brass base and blue steel index plate.

 The side of the lug is sand-blasted too. I used garnet sand.

My wrist is thin. But wearing feel is good!

New watch

At last my new product 'Jumping Hour Watch' was completed! For now, just one photograph. I post the details later.