20
January 2004
M
ILLING
/T
APPING
H
ELP
PAGE
The Milling/Tapping Help page will help you solve three equations relating to milling and tapping. They are:
1. SFM (Surface Feet per Minute) = (CUTTER DIAMETER IN.) * RPM * 3.14159 / 12
2. (FEED IN./MIN.) = RPM / (THREAD PITCH)
3. (CHIP LOAD IN.) = (FEED IN./MIN.) / RPM / #FLUTES
With all three equations, you may enter all but one of the values and the control will compute the remaining
value and display it. Note that the RPM value for equations 1 and 2 are the same entry.
When metric units are selected, the units displayed change to millimeters, threads per mm, mm per minute,
and meters, respectively.
Materials
The Milling calculator includes a field called MATERIAL, which, when highlighted, allows the operator to select
a type of material from the list below using the
left
and
right
arrow keys. Note that one of the materials is
always selected (the first in the list is the default) and the list wraps around at the end.
LOW CARBON UNALLOYED STEEL
MEDIUM CARBON UNALLOYED STEEL
HIGH CARBON UNALLOYED STEEL
NORMAL CONDITION LOW ALLOY STEEL
HEAT TREATED TO 32 Rc LOW ALLOY STEEL
NORMAL CONDITION HIGH ALLOY STEEL
HEAT TREATED TO 32 Rc HIGH ALLOY STEEL
FERRITIC/MARTENSITIC STAINLESS STEEL
AUSTENITIC STAINLESS STEEL I
AUSTENITIC STAINLESS STEEL II
AUSTENITIC PRECIP. HARDENED STAINLESS
IRON BASED HEAT RESISTANT ALLOY
NICKEL BASED HEAT RESISTANT ALLOY
COBALT BASED HEAT RESISTANT ALLOY
TITANIUM HEAT RESISTANT ALLOY
GRAY CLASS 20 CAST IRON
GRAY CLASS 30, CLASS 40 CAST IRON
NODULAR CAST IRON
ALUMINUM ALLOY
BRASS - BRONZE ALLOY
HI-VELOCITY MACHINING ALUMINUM ALLOY
A recommended surface speed and chip load will be displayed based on the material chosen, as shown below
on the right.
SURFACE SPEED *.*** FT/MIN RECOMMENDED **** TO *****
CHIP LOAD *.*** IN RECOMMENDED *.*** TO *.***
Also, the required horsepower will be calculated and displayed as shown below on the right.
CUT DEPTH *.*** IN REQUIRED POWER *.* HP
When in metric mode, the required power is displayed as KW. The remaining calculator functions are unchanged.
Unspecified Material
If the Material calculator display is listed with PRESS < or > FOR MATERIALS, no recommendations are
displayed. The user can select any material from the list and the recommended data will be displayed as before.
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