::lancer tools::

FORMULAE For Face milling
CUTTING SPEED(Pc)
*Divide by 1000 to change to m from mm.	vc (m/min)	Cutting Speed	Check the item you want to calculate, input values in the two boxes, and then press the Calculate button. D1 (mm) n (min^-1) vc (m/min)
	D1 (mm)	Cutter Diameter
	π (3.14)	Pi
	n(min^-1)	Main Axis Spindle Speed
	(Problem) What is the cutting speed when main axis spindle speed is 350min^-1 and cutter diameter isø125? (Answer) Substitute π=3.14, D1=125, n=350 into the formulae.

FEED PER TOOTH (fz)
	fz (mm/tooth)	Feed perTtooth	Check the item you want to calculate, input values in the three boxes, and then press the Calculate button. vf (mm/min) z n (min^-1) fz (mm/tooth)
	z	Insert Number
	vf (mm/min)	Table Feed per Min.
	n (min^-1)	Main Axis Spindle Speed (Feed per Revolution f = z x fz)
	(Problem) What is the feed per tooth when the main axis spindle speed is 500min^-1, insert number is 10, and table feed is 500mm/min? (Answer) Substitute the above figures into the formulae. fz=vf÷(z×n)=500÷(10×500)=0.1mm/tooth The answer is 0.1mm/tooth.

TABLE FEED (vf)
	vf (mm/min)	Table Feed per Min.
	z	Insert Number
	fz (mm/tooth))	Feed per Tooth
	n (min-1)	Main Axis Spindle Speed
(Problem) What is the cutting time when 100mm workpiece is machined at 1,000min-1, with feed=0.2mm/rev? (Answer) First, calculate the cutting length per min. from the feed and spindle speed. l=f×n=0.2×1000=200(mm/min) Substitute the answer above into the formulae. Tc=lm÷l=100÷200=0.5(min) 0.5×60=30(sec.) The answer is 30 seconds

CUTTING TIME (Tc)
	Tc(min)	Cutting Time	Input the values L (mm) vf (mm/min) Tc (min) second (s)
	vf(mm/min)	Table Feed per Min.
	L (mm)	Total Table Feed Length (Workpiece Length: l+Cutter Diameter: D1)
	(Problem) What is the cutting time required for finishing 100 mm width and 300 length surface of a cast iron (GG20) block when cutter diameter is ø200, the number of inserts is 16, the cutting speed is 125m/min, and feed per tooth is 0.25 mm. (spindle speed is 200 min^-1) (Answer) Calculate table feed per min vf=0.25×16×200=800mm/min Calculate total table feed length. L=300+200=500mm Substitute the above answers into the formulae. Tc=500÷800=0.625(min) 0.625×60=37.5(sec). The answer is 37.5 sec.