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Setting Lathe Speed
Id hZi i]Z XdggZXi aVi]Z he^cYaZ heZZY [dg ndjg
deZgVi^dc! ndj l^aa cZZY id/ & 9ZiZgb^cZ i]Z
he^cYaZheZZYGEBcZZYZY[dgndjgldg`e^ZXZ
bViZg^Va!VcY'Xdc[^\jgZi]ZaVi]ZK"WZaih[dgi]Z
XVaXjaViZYhe^cYaZheZZY#
Calculating Correct Spindle Speed
1. JhZi]ZiVWaZ^cFigure 54 idYZiZgb^cZi]Z
gZXdbbZcYXjii^c\ heZZY[dg i]Zldg`e^ZXZ
bViZg^Va#
Note: Cutting speeds are expressed in sur-
face feet cut per minute (SFM).
Recommended Cutting Speeds
Ldg`BViZg^Va
BV\cZh^jb
6ajb^cjb
7gVhh7gdcoZ
8deeZg
8Vhi>gdcHd[i
8Vhi>gdc=VgY
B^aYHiZZa
8VhiHiZZa
IddaHiZZa
6aadnHiZZah=VgY
HiV^caZhhHiZZa
I^iVc^jb
=^BV\VcZhZHiZZa
6kZgV\ZIddaHeZZYh[b
Rough Cuts Finish Cuts
)%%
(*%
'*%
&%%
&%%
*%
&%%
,%
*%
*%
+%
.%
)%
-%%
,%%
*%%
'*%
'*%
&*%
'*%
&*%
&*%
&*%
&-%
'%%
&%%
Note: These values are based on HSS cutting
tools. For carbide cutting tools, double the aver-
age speed. These values are a guideline only.
Refer to the MACHINERY’S HANDBOOK for
more detailed information.
Figure 54.GZXdbbZcYXjii^c\heZZYiVWaZ#
2. 9ZiZgb^cZ i]Z [^cVa Y^VbZiZg! ^c ^cX]Zh! [dg
i]ZXjindj^ciZcYidbV`Z#
Note: For this step, you will need to average
out the diameters or work with the finished
diameter.
3. JhZ i]Z [daadl^c\ [dgbjaV id YZiZgb^cZ i]Z
XdggZXihe^cYaZheZZYGEB[dgndjgdeZgV"
i^dc/
Cutting Speed (SFM) x 4
Diameter of Cut
Spindle Speed
=
Example A
Ndjl^aabV`ZV
&
¿'Y^VbZiZg[^c^h]Xji dcV
XVhi hiZZa ldg`e^ZXZ! jh^c\ Vc =HH Xjii^c\
idda#
Step 1:
&*%H;B[gdbX]Vgim)2+%%
Step 2:
+%%$#*9^VbZiZgd[Xji2&'%%
Result:
I]ZXdggZXihe^cYaZheZZY^h&'%%GEB#
Example B
Ndj l^aabV`ZV &Y^VbZiZggdj\] Xjidc V
hiV^caZhh hiZZa ldg`e^ZXZ! jh^c\ V XVgW^YZ
Xjii^c\idda#
Step 1:
+%H;B[gdbX]Vgim'[dgXVgW^YZidda2
&'%
Step 2:
&'%9ZiZgb^cZYH;Bm)2)-%
Step 3:
)-%$&9^VbZiZgd[Xji2)-%GEB
Result:
I]ZXdggZXihe^cYaZheZZY^h)-%GEB#