Pendulum Bob

I elected to deviate from John Wilding's lead pendulum bob (to avoid the casting and spinning process), and instead made it from solid brass.

Cutting the solid brass bar into two thin sections, utilising a power hacksaw.

One half of the pendulum bob.

Turning the pendulum bob.

Profiling the front of the pendulum bob.

A well worn Myford was used for this project, and the cross slide no longer cut at 90 degree angles. To get the two inner surfaces of the pendulum bob perfoectly flat, the top slide had to be used (with a slight offset). To avoid clashing of the topslide crank with the crosslide, a custom (narrow) knurled drive knob had to be turned.

The two finished halves of the pendulum bob.

The two mated halves of the pendulum bob.

Cutting the pendulum bob slot.

Completed cut slots.

Pendulum bob assembly.

Marking out the securing screw holes.

Optical punch view.

Drilling the pendulum bob.

Drilled and tapped pendulum bob.

Opened pendulum bob.

Cutting pendulum bob screws.

Finished pendulum bob assembly, with flush mounted screw, to cut down on drag.