Grizzly G4000 Lathe User Manual


  Open as PDF
of 76
 
BdYZa<)%%%B[\#H^cXZ-$%.
"(("
Calculating Correct Spindle Speed
1. JhZi]ZiVWaZ^cFigure 43 idYZiZgb^cZi]Z
gZXdbbZcYZYXjii^c\heZZY[dgi]Zldg`e^ZXZ
bViZg^Va#
Note: Cutting speeds are expressed in SFM
(surface feet per minute) that the workpiece
moves against the cutter, which is different
from the spindle speed (RPM).
Recommended Cutting Speeds
Ldg`BViZg^Va
BV\cZh^jb
6ajb^cjb
7gVhh7gdcoZ
8deeZg
8Vhi>gdcHd[i
8Vhi>gdc=VgY
B^aYHiZZa
8VhiHiZZa
IddaHiZZa
6aadnHiZZah=VgY
HiV^caZhhHiZZa
I^iVc^jb
=^BV\VcZhZHiZZa
6kZgV\ZIddaHeZZYh[b
Rough Cuts Finish Cuts
)%%
(*%
'*%
&%%
&%%
*%
&%%
,%
*%
*%
+%
.%
)%
-%%
,%%
*%%
'*%
'*%
&*%
'*%
&*%
&*%
&*%
&-%
'%%
&%%
Note: These values are based on HSS cutting
tools. For carbide cutting tools, double the aver-
age speed. These values are a guideline only.
Refer to the MACHINERY’S HANDBOOK for
more detailed information.
Figure 43.8jii^c\heZZYiVWaZ#
2. 9ZiZgb^cZ i]Z [^cVa Y^VbZiZg! ^c ^cX]Zh! [dg
i]ZXjindj^ciZcYidbV`Z#
Note: For this step, you will need to aver-
age out the diameters or work with the finish
diameter.
Example A:
Ndjl^aa[^c^h]Xji
&
¿'Y^VbZiZge^ZXZd[
XVhi hiZZa hidX`! jh^c\ Vc =HH Xjii^c\
idda#
Step 1:
&*%H;B[gdbX]Vgim)2+%%
Step 2:
+%%$#*9^VbZiZgd[ldg`e^ZXZ2&'%%
Result:
I]ZXdggZXihe^cYaZheZZY^h&'%%GEB#
Example B:
Ndj l^aa gdj\] ijgc V & Y^VbZiZg e^ZXZ
d[hiV^caZhhhiZZa!jh^c\VXVgW^YZXjii^c\
idda#
Step 1:
+%H;B[gdbX]Vgim'[dgXVgW^YZidda
2&'%
Step 2:
&'%8VaXjaViZYH;Bm)2)-%
Step 3:
)-% $ & 9^VbZiZg d[ ldg`e^ZXZ 2 )-%
GEB
Result:
I]ZXdggZXihe^cYaZheZZY^h)-%GEB#
3. JhZ i]Z [daadl^c\ [dgbjaV id YZiZgb^cZ i]Z
XdggZXihe^cYaZheZZYGEB[dgndjgdeZgV"
i^dc/
Cutting Speed (SFM) x 4
Diameter of Cut
Spindle Speed
=
 previous next