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USER’S GUIDE FOR AKKO U-DRILLS
CALCULATING SPINDLE SPEED and FEED RATE FOR MILLING PROCESS
CUTTING SPEED AND REVOLUTION THAT ARE NEEDED FOR USING ( RUNNING ) YOUR U-DRILLS MORE PRODUCTIVELY
FEED CALCULATION FOR CENRTRAL MACHINE :
Before connecting your U-Drill to CNC lathe, you have to check if the turret is eccentric from the center or not. If
there is any eccentricity in your turret, never use your U-Drill;
Processes that should be done to fix the turret :
1. A cylindirical part whose surface is precision and whose length and diameter is the same with the U-Drill that you
will use, should be mounted to the holder of turret and X value of the lathe should be brought to zero ( 0 ).
2. Comparator should be mounted to chuck. The end of the comparator should be contacted ( touched ) to the sur-
face of the part that we mounted on the turret.
3. The comparator that we mounted on the chuck should be turned 360-degree with the chuck and turret should be
zeroed by that turning according to changing rate of comparator.
P.S. : The cutting speed may be concerned with the type of the insert that you use.
Fistly, choose the material to make calculation of revolution. You should multiply the cutting speed (Vc) of the material that you chose by 1000 and divide
by 3.14. You should divide the value that you found by the diameter of U-Drill. For Example : If our material is alloy steel and tool steel ( 3rd group ), diame-
ter of the U-Drill is 25 mm, cutting speed is 170, we should calculate as following; 170x1000=170000/3.14=54140, 54140/25=2166 rpm is the result
that we found ( Spindle Speed ) Feed rate of the lathe is concerned with the U-Drill that you will use and changes between 0.05 and 0.10. The user sets it
according to cut of cutting insert.
For Example : We will make milling with milling tool whose diamention is D 50 mm, whose theeth number is Z=5. The spindle
revolution was written as Vc=200m/mn at the back side of cutting insert box. Let’s calculate the revolution that should be
entered to the milling machine : Vc=200 m/mn D=50 mm
S = Firstly Cutting Speed is multiplied with 1000, the result should be divided by 3.14 , the last result should be divided by
diameter of milling tool.
S = 200 x1000 = 200000 200000/3,14 = 63663 63663/50 = 1273 rev S=1273 rev / mn
After finding spindle revolution, let’s find feed rate : milling tool with Z=5 teeth and we read fz=0,12 from the back side of
cutting insert box.
F = Tooth number should be multiplied with revolution, the result should be multiplied with feed per tooth.
F = 1273 x 5 = 6365 6365 x 0,12 = 763 F = 763 mm / mn
Revolution that should be entered to the milling machine = S 1273 Feed Rate that should be entered to the milling machine
= F 763 average value.
P.S : The values Vc and fz has to be written at the back side of the cutting insert. If these values were not written on the
cutting insert box, please find them from cutting insert catalogue. If the material that you will work is steel, please read Vc
and fz values that were written on the part P, if it is stainless steel please read from the part M, if it is cast iron please read
from the part K.
2166 spindle speed, that we found as a result of above mentioned calculation, should be mutiplied by cutting
insert feed ( mm/r ) between 0.05 and 0.10 feed choisses. Example 1 : 2166x0.05=108
Example 2 : 2116x0.10=217 The results 108 and 217 are the feed mm/m calculation for central machine.
Grup No.
1
2
3
4
Non-alloy steel and free cutting steel
Low alloy steel and cast steel
Alloy steel and tool steel
Hot Work Steel and Stainless Steel
C1010. Automat etc.
C1030 – 106 etc.
CK-45, 4140, 7131 etc.
Impax etc.
220
200
170
150
Material
Material Type
Cutting Speed Vc ( m/m)
fz
FORMULAS
Vc.
Cutting Speed
(Please read
from the back-
side of cutting
insert box)
Spindle
Revolution
rpm
Milling
Tool
Diameter
Number of
Effective
Tooth
Feed Per Tooth
(Please Read From
The Back Side of Cutting
Insert Box)
Calculation of Revolution :
S=(Vc x 1000) / (3,14 x D)
Feed Rate Calculation :
F=S x Z x fz
Feed
Rate
S
D
F
Z
TECHNICAL INFORMATION