Posts

Showing posts from October, 2019

Four Sided Machining With an Indexer

Image
I'm working on a project that requires hundreds of precisely machined components. Most of them can be produced easily from sheet stock or scrap lumber using 2D cutting methods. A few I've made by hand as they were just a one off.

One part I need for the project, a piece about nine inches by three inches by one inch thick, is machined on four sides. The shape is a trapezoid, or more correctly, a parallelogram with two sides offset by six degrees. Two nearly vertical slices chopped out of one side are also offset by six degrees. Various holes are drilled for pegs and other things. It's also 3D shaped on the top and bottom (three inch sides).


The problem with multi-side machining is registration. A part is accurately registered if it is placed on the machining bed exactly in the place it should be. Knowing where the part is physically located is critical when attempting to machine it. The machining tool has no idea what is where. It only knows what to do. If the part isn'…