How this feedrate Vf been calculated ?

NzNacer · Jul 9, 2016

Hi there ,

Chip thinning is new term for me , I'm old school machinist ,

Feedrate formula is Vf= N*Fz*Number of flutes or teeth
N=Rev par minutes
Fz= Tooth load

I want to know how these guys applied chip thinning to this work (see pic)

Atomkinder · Jul 9, 2016

This is a good explanation: HSM Machining > How to: High Speed Machining (HSM), CNC Milling

I'm also a customer and use HSMAdvisor nearly daily, and love it. :cheers:

NzNacer · Jul 9, 2016

Thanks AtomKinder fro responding

I have red the article you gave me , it s very informative , please be patient with me
let's say i have 0.05 chipload par tooth and i want 30% redial engagement of the tool what I should do is 0.05 *(chip thinning factor given by the tool manufacturer ) let's say 1.091
new chip load = 0.05*1.091

Atomkinder · Jul 9, 2016

Yes that would be correct. Also keep in mind that much of this, like recommended chipload from the manufacturer, is a starting point only. Different geometries will affect what sort of chipload is feasible, as well as considerations such as machine acceleration capabilities. I have found that generally HSM is much safer with regards to tool life as well, making roughing operations very predictable IE watching the chips is a very good indicator of tool wear.

Edit: as a reference, one of my favorite test parts runs a 1/2" 6-flute end mill (12.7mm) at 8828 RPM and 296 IPM (.00559"/.1419mm per flute), 10% stepover. And that's a conservative chipload.

NzNacer · Jul 9, 2016

Thanks AtomKinder .

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