[hacdunqh]

Could any one tell me formula you use to determine specific cutting force. Current Sandvik catalog doesn't include formula or example of using it. Am curious if in current catalog I multiply value by 250% if I'm taking a .04 chip as opposed to .016. Seems logical. Would think formula is in older catalog.

[gunaydinemre]

ks=ks11*h^(-z)*k(alfa)*k(tool)

you need more coefficient to calculate ks

k(alfa)=c-1.5*chip angle of tool/100
k(tool)=stell=109
h=chip thickness
h=(360/3,14*Q)*(a/D)*Sz*SinX
Q=Cutting angle
a=depth of cut
D=tool diameter
Sz=feed rate for 1 teeth
X=90 for endmilling
CosQ=(D/2)-a/(D/2)

[Geoff Hicks]

Hello

This is what i found.

Ap = Axial depth of cut
Ae = Radial Depth of cut stepover
Vf = Table Feed
Kc = the specific cutting force value (kc) is a material constant
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formula
HP=(Ap*Ae*Vf *Kc) / (10³ *396)

HP 8.34 = (0.75*.05*200*440,800) / (1000*396)
__________________________________________________ ________________

I need help learning the (KC)
(1) Where do i find this value?
(2) How can i calculate from
• Rockwell
• Tensile Strength
• Other

Geoff Hicks