Rpm (Spindle Speed); Rpm - Milling - Calculated Industries 4087 User Manual

rPm (SPINDlE SPEED)

RPM is the rotational speed of the spindle in revolutions per
minute. In a milling machine or drill, the Spindle Speed is the
rotation of the attached cutting tool. In a turning machine, it is
the rotation of the attached workpiece. RPM can be calculated
given values for Diameter and Cutting Speed.
RPM – Milling
Calculate the Spindle Speed (RPM) when milling with a .375"
bit at a Cutting Speed of 300 sfm (surface feet per minute):
KeySTROKe
O O
1. Enter the bit Diameter:
. 3 7 5 d
2. Enter the Cutting Speed:
30 0 C
3. Calculate the Spindle Speed (RPM):
R
R
R
*
r R
* The calculated RPM is displayed as a rounded, whole number value.
displays the stored RPM value in decimal floating point format.
rR
26 — M
achinist
c P
alc™ ro
Diameter: .375"
RPM
DIA
CUT
CUT
DIA
RPM
DISPLAy
0.
0.375
$
INCH
300.
$
feeT/MIN
RPM 3056.
300.
$
feeT/MIN
0.375
$
INCH
3055.7749
$