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As a general rule of thumb, the larger the diameter of work the lower the speed and feed and vice versa.

Cutting speed and feed calculator 2 Cutting speed and feed calculator 3 Cutting speed and feed calculator 4

Cutting speed and feed calculator 1 Cutting speed and feed calculator 2 Cutting speed and feed calculator 3 Cutting speed and feed calculator 4

Lathe Feed: The feed of a lathe is the distance the cutting tool advances along the length of the work for every revolution of the spindle. For example, if the lathe is set for a .0.5 mm feed, the cutting tool will travel the length of the work .0.5mm for every complete turn that work makes. The feed of a lathe is dependent upon the speed of the lead screw or feed rod. The speed is controlled by the change gears in the quick change gearbox. Whenever possible, only two cut should be taken to bring a diameter cut. Since the purpose of a rough cut is to remove excess material quickly and surface finish is not too important. A coarse feed should be used. The finishing cut is used to bring the diameter to size and produce a good surface finish and therefore a fine feed should be used. The recommended feeds for cutting various materials when using a high speed steel cutting tools listed in table below. For general purpose machining a .15 – ..5 mm feed for roughing and a .3 to .1 mm feed for finishing is recommended.

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Different cutting operations will require different cutting speeds. For example screw cutting will be slower than parallel turning.