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Difference between gear hobbing and gear shaping.



Difference between gear hobbing and gear shaping. with reference to various relative motions and applications



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Hobbing is the process of roughly, quickly cutting teeth in a gear. A hob is a rotary device which, used for worm, spur or helical gears. Is often used for a known gear type or mass production where cost efficiency is paramount. 

Shaping is when a power tool (such as a bridge port or boring mill) cuts individual teeth. For an unusual type of gear. 


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Generally Gear shaping is where the teeth are generated by a reciprocating tool, gear hobbing is done using a revolving cutter and the workpiece revolving against the cutter, hobbing is generally quicker at producing a gear wheel and fairly accurate as it produces a good diameteral pitch (DP) and tooth profile. Gear shaping can be done with a single revolving cutter in a milling machine so long as a cutter of the correct tooth form is used, this method does not produce as good a DP as the work piece is stationery where one tooth at a time is cut. I have cut gears on my milling machine and on my shaping machine. Gear shaping is the way large gears are cut. I have seen Sunderland Gear Planers cutting gear wheels of 25ft (10 to 12 metres) diameter. small gear planers are quit common, the tool reciprocates against a revolving gear blank which rotates 1 tooth at a time after each stroke until the whole gear has been cut.

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