-27-
Df[\cD('00D]^J`eZ\/&'.
FG<I8K@FEJ
Kf[\k\id`e\k_\Zfii\Zkjg`e[c\IGD#[fk_\j\jk\gj1
(% Use the table in =`^li\)/to determine the cutting
speed required for the material of your workpiece.
)% Measure the diameter of your workpiece in inches
and subtract the depth of the cut that will be taken
on the initial pass.
*% Use the formula in =`^li\)0 to determine the
needed RPM for your operation.
 Efk\1 8cnXpjifle[kfk_\Zcfj\jkIGD^`m\efe k_\
jg`e[c\jg\\[Z_Xik#Xe[X[aljkpflijg\\[Xjk_\
nfibg`\Z\[`Xd\k\i[\Zi\Xj\j%
<oXdgc\(
You have a piece of 1⁄2" diameter aluminum stock,
and you are using workpiece with a HSS cutting tool.
 Jk\g(1
300 (SFM from chart) x 4 = 1200
 Jk\g)1
1200 / 0.5" (Diameter of workpiece) = 2400 RPM
 I\jlck1
The needed speed for this workpiece is 2400 RPM.
<oXdgc\)
You have a piece of 1" diameter stainless steel stock,
and you are using a workpiece with a carbide cutting
tool.
 Jk\g(1
60 (SFM from chart) x 2 (for carbide tool) = 120
 Jk\g)1
120 (determined SFM) x 4 = 480
 Jk\g*1
480 / 1" (Diameter of workpiece) = 480 RPM
 I\jlck1
The needed speed for this workpiece is 480 RPM.
;\k\id`e`e^ :fii\ZkJg`e[c\IGD
=`^li\)/% Cutting speed table for HSS
cutting tools.
:lkk`e^Jg\\[j]fi?`^_Jg\\[Jk\\c
?JJ :lkk`e^Kffcj
Workpiece Material Cutting Speed
(sfm)
Aluminum & alloys 300
Brass & Bronze 150
Copper 100
Cast Iron, soft 80
Cast Iron, hard 50
Mild Steel 90
Cast Steel 80
Alloy Steel, hard 40
Tool Steel 50
Stainless Steel 60
Titanium 50
Plastics 300-800
Wood 300-500
Efk\1 =fiZXiY`[\Zlkk`e^kffcj#[flYc\
k_\Zlkk`e^jg\\[%K_\j\mXcl\jXi\X
^l`[\c`e\fecp% Refer to the D8:?@E$
<IPJ?8E;9FFB for more detailed
information.
=`^li\)0% Formula to determine required
spindle speed for lathes.

4IGD

J=D o+

Nfibg`\Z\

;`Xd\k\i

=X`cli\ kf ]fccfn IGD Xe[ ]\\[ iXk\
^l`[\c`e\jdXpk_i\Xk\efg\iXkfijX]\$
kp]ifd\a\Zk\[gXikjfiYifb\ekffcj%