Hi, colleagues! I am designing a smaller, three-axis CNC router for processing soft materials, where the hardest work piece would be an aluminum board. I am currently calculating a shaft of the main motion (spindle shaft) and trying to determine the force which loads the shaft during cutting, in addition to the force that tightens the belt (see the attachments). There is also a tangential force at the top of a milling cutter. - So I'm interested in how to calculate the tangential (Ft) and radial (Fr) , during cutting aluminum with an 8 mm end mill with 4 flutes. (There is also an axial force, but my priority is radial).
I found some literature where is shown method to calculate these forces, but there are tables with coefficients and exponents related only to steel.(see the attachments) I didn't found any information related to aluminum cutting.
If anyone have these data, or some other methods, I would be extremely grateful to post.
Thank you.
If you want, you can following the document attached. This work only include the formula for tangential force.
From my experience, radial force dont have any importance, and the relative resistance to cutting of aluminum and steel is at least four times less.
Thank you for this material! Very quality explanations.
I have one question: Cutting force, Fc (on the last page of document) represents force at the end of cutter, on picture force F?(see the attachments). And in final equation, on the last page, (Fc=Zc*Kz*S), Kz represents Specific Cutting Force of material?
Cutting force is the tangential force (Ft). This vector plus the radial force (Fr) gives the resultant in the plane of the picture (F).
And yes, kz = Specific Cutting Force of material .
Avram Kovačević what does the variable S and Zc stand for in the formula?
S is the Undeformed Cutting Area and Zc is the number of teeth in contact (that is, the fraction of the total number of teeth of the mill tool, which cuts material simultaneously).
Hello
Please help me figure out how to calculate Fa.
Is there a simplified formula?
I cant seem to find anything. Avram Kovačević
Dr Saravana Murthi C.
This is the torque for the spindle
I need help to calculate the force in the direction of travel.
Thank you!!
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