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confusion about feeds

mksltr85

Plastic
Joined
Aug 7, 2017
Can someone help me better understand Programmed feed per tooth(fz) as a % of radial depth of cut(ae).
 
If I understand your question correctly.
Programmed feed per tooth depends on the type of material and the tool.
Reduced radial engagement (below 50%) makes effective chip thickness less than the programmed value, so the programmed value must be increased.

More info here:
Numbers Behind High Speed Machining (HSM) | HSM Machining

Also check out the free FSWizard
It outputs the chip thinning factor it applies to the calculated results:
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Download the Free HEM Guidebook


Download this HEM book. It has the chip thinning formulae and a bunch of other fundamentals for milling factors.

It’s a good read.


(If you don’t trust the link, just google “HEM guidebook”, it’s the top result. Harvey tools are pretty well known.)
 
I have never seen anyone using feed per tooth(fz) as a % of radial depth of cut(ae). Can you share the reference where you have found that information?

Feed per tooth (fz) is how much a tooth takes for one complete rotation.
Radial depth of cut (ae) is how much the tool is engaged in material. Most people prefer to use it as percentage of tool diameter (ae = d*0.5, ae = d*0.2, etc.)

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