Posted by Bill Simpson on November 28, 1999 at 22:51:13:
In Reply to: Re: 45 helix angle posted by R.Vatieri on November 28, 1999 at 09:40:55:
In theory at least, climb hobbing yields better finish and less tool wear, but the machine and work holding fixtures must be solid, and the cutter table drive can't have any backlash or "creep" that would allow the cutter to pull itself under the workpiece. Jumping under the workpiece is a common cutter buster.
There are a number of speed/feed sources based on tool material, machining operation, and work material. The Machinist Handbook has a section on speed/feed. Usually, these numbers are for starters only, and you'll need to adjust based on your job's circumstances.
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