Abstract: A method of making a collimator having a generally honeycomb shape made from sheets of thin metal. The sheets are deformed using a progressive form die assembly into what may be termed truncated pyramids alternately inverted with top and bottom major flats connected by slant walls. Successive sheets are joined together by displacing them relative to each other so that the top major flats of the truncated pyramids of one sheet contact the bottom major flats of the succeeding sheet. Advantageously, the edges of the sheet are tapered to a pointed edge by the progressive form die assembly, which may also form roughened surfaces on the sheets by swedging. Edges of the slant walls which connect top and bottom major flats of the truncated pyramid shape are provided with a dual taper, and the edges of the major flats are provided with a single taper. When successive sheets are joined, the top and bottom major flats of successive sheets form a dual tapered edge from the single tapered edges on the flats of each sheet.