![]() ![]() Tool grinding involves the sharpening of drills, taps, milling machine and lathe cutters.Damaged end mills are often cut off with abrasive wheels in preparation for regrinding. Cutoff grinding works well for severing and slotting hard materials, particularly HSS stock, drill rod, dowel pins, and reamer blanks.The grinding wheel may be fixed and work hand-held or vice versa. Offhand grinding applies size and shape to workpieces.What are the main grinding processes and their applications? Grinding wheels are the only self-sharpening cutting tools. When a grain becomes dull, the extra force between the wheel and the workpiece causes the dulled grain to break away due to a soft bond or friable grains. When work is brought into contact with a rotating grinding wheel, each abrasive grain on the wheel’s surface acts as a cutting tool and removes a tiny metal chip. How does the grinding process remove material? Examples of already-ground components are ready-to-machine ground flat stock, bearings, drill rod, drill blanks, reamer blanks and dowel pins. This avoids the delay and inconvenience of sending out work. Although this type grinding may be sent out to a grinding shop, it is often possible to purchase components that already have the ground surfaces needed and incorporate them into the project. Only the specialized grinding operations, center-less, cylindrical, internal, and surface grinding, that use dedicated machines, are beyond the range of most machine shops. The basic versions of these processes are easy to learn and master. In the republic of mediocrity, genius is dangerous.Īlthough grinding, reaming, broaching, and lapping remove a relatively small metal volume compared with turning and milling, they are important processes because they are often the last machining operation and determine final size and finish. ![]() Chapter 4 Grinding, Reaming, Broaching & Lapping ![]()
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