Re: Liebherr LC-82 W/Siemens controll


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Posted by Bill S. on November 10, 2000 at 20:59:29:

In Reply to: Liebherr LC-82 W/Siemens controll posted by Lane Stott on November 10, 2000 at 14:06:16:

Hi Lane,
Chip load, or chip thickness, is calculated from 3 items: (1) Table Feed (inch/revolution), (2) cutter Threads or starts, and (3) number of Gashes in the hob.

If you know all three items above, chip thickness in inches is equal to:

Table Feed x Cutter Threads
---------------------------
      Hob Gashes

Please note that Chip Load is different from Surface Speed. Surface speed (Inch Per Minute) is calculated as:

3.1416 x Cutter Diameter x Cutter RPM

I think that chip load is generally limited by machine horsepower and rigidity of machine/workpiece fixturing.

Surface speed is usually limited by workpiece material hardness, tooling factors (hardness, coating, expected pieces per regrind) and coolant.

Additionally, to improve cutter life, the usual rules of thumb are to:
Reduce surface speed
Increase chip load (within limits)
Climb hob where practical
Use coated hob tooling
Use cutting fluid selected for material
Reduce material hardness if possible

Hope this helps


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