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Molybdenum Turning and Milling

For inside and outside turning, tools should be ground to angles and rakes similar to what is used for cast iron. Speeds up to 200 feet per minute, with a depth of cut up to 1/8”, are fine for rough turning. The feed should be .015 i.p.r. For finishing work, speeds tsp to 400 feet per minute, with a depth cut of .005” to .015”, and a feed of .005” to .010” should be used. It is extremely important, when turning, that the depth of the cut always be greater than .005”. If the depth is less, tool wear will be excessive. Sulphur based cutting oil may be used as a lubricant for roughing cuts, and kerosene Or sulphur base cutting oil can be used for finishing work. If lubricants are not used tool wear will be excessive. Sulphur base oils cannot be used for electronic parts. Chlorinated oil and solvents are excellent as a machining lubricant. Molybdenum tends to chip when being machined so care must be taken to prevent this. Work should be tightly chucked, tools rigidly supported and machines should be sufficiently strong and free from chatter or backlash. Plenty of coolant is essential. Face milling in general is not recommended. However, it can be done when necessary. Carbide tipped cutters muse be used. The speeds and depth of the cut should be similar to those used in lathe turning, except that the depth of cut should not exceed .050”. Molybdenum plates can be edge machined. It is recommended that plates greater than .050” should be edge machined Rather than sheared to your finished dimensions. This can be done either on a shaper or a milling machine, and the machining should be done along the edge, rather than across the edge. The molybdenum should he clasped between steel plates while being machined to avoid chipping.

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