Model 2 Dial
September 14, 2024
The new Model 2 dial is a hand guilloched silver with 3 patterns, 18k gold angular chapter rings with pad printed markers, and 18k gold hour indices with superlume.
This was a particularly challenging project. The main dial has 4 zones for 3 different guilloche patterns. After the hand guilloche, the recess for the chapter rings were machined to a depth of 0.2 mm and a tolerance of 0.005 mm.
The chapter rings were machined, circular grained on a lathe, and then pad printed on our custom built pad printer. This also required making a new cliche for the pad printer. The chapter rings are angular (not flat), meaning that the inside diameter has a height of 0.25 mm whereas the outside diameter has a height of 0.4 mm. This improves the reflection in the light and creates a more dramatic 3D appearance to the dial.
The hour indices were machined with a 2 mm endmill, then the pockets were machined with a 0.05 mm and 0.01 mm endmill (see the photo with a mechanical pencil). The indices were polished and then superlume added to the pockets using an oilier. The indices measure 1.2 mm x 0.9 mm x 0.2 mm (L W H), the pocket for the superlume is 0.1 mm deep, and the feet are 0.3 mm.
Finally, everything was assembled and the result is striking.
4th Axis Fixture
March 17, 2023
The Roysdon Model 2 is well underway, but there are some specialized fixtures that are needed. For example, while the top and bottom of the bracelet is machined on an Elara CNC mill, a 4th axis operation is required to drill the holes for the screws that connect each link. This 4th axis fixture is used for the following operations:
ball-mill and endmill finish-pass on the right and left side of each link
endmill finish-pass on the front and back of each link
drill the holes for the screws that connect each link (top video)
drill the holes for the spring bars in the clasp (middle video)
drill the holes in the clasp retainer (the part that keeps the clasp closed)
mill the holes for the clasp release buttons (bottom video)
This fixture took 2 months to design in Fusion 360, and 90 hours to machine on the NS CNC Elara 4-axis Mill.
In the videos, the bracelet parts are prototypes made in tool wax. The final bracelet is made of either 18k gold or 316L stainless steel.