CNC-turned from stainless steel, this is a 400mm long and 38mm diameter IOM keel bulb. A slot will be milled in the middle for the keel fin. Unlike a lead-bulb this one will require no surface filler/sanding/painting. But the density (compared to water) of stainless steel is 8 at most, while lead bulbs can be [...]

Jari shot some videos during the milling of the beaver-tail bulb. They now appear on YouTube. For a mostly home-built cnc minimill of this size, this is pretty ‘hard core’ stuff…

Jari made this steel bulb over the weekend. It has a slightly triangular cross section in the beginning which flattens out to a ‘beaver-tail’ at the end.

As a first serious test-run for our now servo-controlled cnc mill we decided to make an IOM bulb out of steel. It ends up a bit bigger in volume when made out of steel compared to lead, but the difference isn’t huge. Making it with a cnc mill allows designing almost any reasonable 3D shape [...]