Re: gear milling on a standard milling machine


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Posted by Stepan Lunin on November 29, 2007 at 15:11:34:

In Reply to: Re: gear milling on a standard milling machine posted by david on April 05, 2007 at 21:10:12:

Some gears are currently fabricated on a CNC machine, For example all the new variable ratio racks (or the forging production tool) on automobile steering system are produces on 4 axis CNC machine. In general it is less expensive to produce 2-5 pcs AGMA class 9 spiral bevel or a hypoid gears on a CNC milling machine compare to the cost of doing the same on, for example GLEASON Phoenix machine, which would require a high setup cost including summary calculation, cutters and contact pattern development. Some gears are only produced on CNC milling machines, like TEXTRON could produce a double enveloping worm gear (its trade name ConeDrive) in MI. Besides the cost reduction, there are other advantages of CNC milling versus generating method. For example, a CNC machines spiral bevel gear does not require an expensive contact pattern development because it can be designed theoretically conjugated. As you may know GLEASON generating method does not produce a conjugated gear unless complicated and expensive adjustments are used. In order to make a gear on a CNC milling machine you would need a 3-d CAD model of the gear. Different suppliers of 3 dimensional gear CAD models are available. Thanks, Stepan Lunin ZAKGEAR


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