Calculated Industries 4087 User Manual - — 27
U
ser
'
s
G
Uide
— 27
RPM – Turning
Calculate the Spindle Speed (RPM) needed to turn a piece with
a 5" Diameter at a recommended Cutting Speed of 650 sfm:
KeySTROKe
DISPLAy
O O
0 .
1. Enter the bit Diameter:
5 d
DIA
$
5.
INCH
2. Enter the Cutting Speed:
6 5 0 C
CUT
$
650.
feeT/MIN
3. Calculate the Spindle Speed (RPM):
R
*
RPM 497.
* Repeated presses of
R
will toggle through the inputs and outputs,
starting with the entered Cutting Speed.
RPM – Drilling
Calculate what the RPM (Spindle Speed) should be set to
when drilling into material with a recommended Cutting Speed
of 90 sfm using a .625" bit:
KeySTROKe
DISPLAy
O O
0.
1. Enter the Diameter:
. 6 2 5 d
DIA
$
0.625
INCH
2. Enter the Cutting Speed:
9 0 C
CUT
$
90.
feeT/MIN
3. Calculate the RPM:
R
*
RPM 550.
* Repeated presses of
R
will toggle through the inputs and outputs,
starting with the entered Cutting Speed.