SCIENCE AND TECHNOLOGY ENGLIAH FOR MECHANICAL ENGINEERING When a gear tooth is formed, the tool is in the shape of the space that is being machined out. Some grinding machines use this principle with an indexing mechanism which allows the gear teeth to be formed tooth by tooth Broaches are examples of form tools that machine all the gear teeth simultaneously Shaping成形,插齿 Shaping is inherently similar to planing but uses a circular cutter instead of a rack and the resulting reduction in the reciprocating inertia allows much higher stroking speeds; modern shapers cutting car gears can run at 2,000 cutting strokes per minute. The shape of the cutter is roughly the same as an involute gear but the tips of the teeth are roundedSCIENCE AND TECHNOLOGY ENGLISH FOR MECHANICAL ENGINEERING Shaping Shaping is inherently similar to planing but uses a circular cutter instead of a rack and the resulting reduction in the reciprocating inertia allows much higher stroking speeds; modern shapers cutting car gears can run at 2,000 cutting strokes per minute. The shape of the cutter is roughly the same as an involute gear but the tips of the teeth are rounded. When a gear tooth is formed, the tool is in the shape of the space that is being machined out. Some grinding machines use this principle with an indexing mechanism, which allows the gear teeth to be formed tooth by tooth. Broaches are examples of form tools that machine all the gear teeth simultaneously. 成形，插齿