Grizzly G9249 - SPINDLE SPEED; Calculating Correct Spindle RPM; Configuring V-Belts and Back Gear


 
Spindle Speed
      
        



Calculating the Correct Spindle RPM
1. Figure 48


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 48.
2.       

 Note: For this step, you will need to aver-
age out the diameters or work with the finish
diameter for your calculations.
3.       


Cutting Speed (SFM) x 4
Diameter of Cut
Spindle Speed
=
Configuring the V-Belts and Back
Gear
      
      

To configure the V-belts:
1. 
2.      Figure 49  
      

 Note: This chart is also on the front of the
headstock. The "Direct" speeds are with
the back gear disengaged. Instructions for
engaging the back gear are on Page 35.
6
&
' (
/min.
A
B
& ' (
DIRECT
BACK GEAR
1200 900 655
550 410 300
220 165 120
100 75 50
7
B
Figure 49.