Category archives: Machining and gcode

Machining on my Sherline Mill and Lathe, also writing gcode routines and CNC.

RSS feed of Machining and gcode

Cutting out Elliptical Plaques

Cutting out Elliptical Plaques

I got a commission to do some paintings onto an elliptical enamel plaque. The major and minor axis of the ellipse are to be 150mm by 90mm, respectively. The paintings are to be of a house in each of the seasons, so four paintings in all, and each one is to be inset into the seat of handmade bar stool.

Continue reading

Making a watch case (part 17), making a movement holder

Making a watch case (part 17), making a movement holder

The watch movement is considerably smaller than the watch case I've made, so it will need some sort of holder to secure it in place. I'm making this ring from solid brass, so a bit different to the other method of making the ring from a bar, soldering and hammering into a ring.

Continue reading

Making a watch case (part 17), tapping some holes

Making a watch case (part 17), tapping some holes

The base fits snugly into the middle watch section but it's going to need some screws to make sure it stays fixed. I'm using the middle watch section to position the mill table, using the previous holes as guides and a wiggler to centre the spindle.

Continue reading

Making a watch case (part 16), adding some curves

Making a watch case (part 16), adding some curves

I'm going to curve the back section to get rid of the right angled edge. I've written this g-code routine already for the top watch section so I'll use it again. Strictly speaking the back section is not supposed to be an ellipse shape, but if I tweak the parameters then it becomes a very shallow ellipse and will be fine for this initial design.

Continue reading

Making a watch case (part 15), fitting the back glass

Making a watch case (part 15), fitting the back glass

I'll be using a flat watch glass for the back section which is quite a bit smaller, in diameter, than the front watch glass. First, though, I cut the back ring diameter to match the middle watch section.

Continue reading

Making a watch case (part 14), cutting the back watch section

Making a watch case (part 14), cutting the back watch section

Now the ring is made it needs to be fit into the middle section.

In this case I'm cutting the inside of the ring first, to get this fully concentric, and clamping the outside. There is no particular preference or benefit of doing the inside or outside first since both should be near circular from the hammering.

Continue reading

Making a watch case (part13), preparing the back section

Making a watch case (part13), preparing the back section

I make a recess in the middle watch section to take the back piece. I'm cutting down 2.0mm into the back of the middle section to leave a 1.7mm thick shelf inside the middle section. This gives strength and acts as a border between the top and bottom watch sections but I think it could be slimmer in future.

The middle section wall thickness is 0.5mm, so it's important to make sure the middle watch section is properly centered on the lathe before making this cut.

Continue reading