Hairline process for the bronze lugs

I added hairline to the lugs by handwork.

At first they were rubbed with #320 sandpaper.

Next with #600 sandpaper.

At last I chamfered edge by hand filing.

A part of crown

The crown is comprised of two parts.

I made one of those today.

 

Screw-ｔap M0.9 for stem.

I put a cut of 0.65 millimeters in width. A micro-gasket is settled there.

Tap for case back screws

I drilled and tapped bronze main case and case back.
I worked in silence...

Tap size is M1.4.

Making counter sink with 2.5mm endmill.

 They are finished like this.

More cutting work of lugs

I will process the thickness.

Then cut at 60 degrees.

The back side is over.

To the opposite side...will be cut at 45 degrees.

All of cutting work of the lugs is completed here.

Continuance of making lugs

I cut both sides of the lug at an angle 4 degrees.

After that I grind a hand filature with an endmill of 2.5mm.

Then drill 1.8mm hole to let a bar go through.

It's like this.

Cut out one pair of lugs

I must make cut and drilling from now on...still won't finish.

Mill the lugs

Now I am milling the lugs from bronze ring...it takes much time.

Cutting screw threads of bronze case

Using M1.6 jet tap to cut threads.

The screw to fix lug is M1.6x3.
Deapth is OK.

Done.