22 — Ma c h i n i s t ca l c ™ Pr o
RPM – Turning
Calculate the Spindle Speed (RPM) needed to turn a piece
with a 125 mm Diameter at a recommended Cutting Speed
of 200 smm:
KEYSTROKE DISPLAY
OO
0.
1. Enter the bit Diameter:
125d
DIA
$
125. MM
2. Enter the Cutting Speed:
200C
CUT
$
200. M/MIN
3. Calculate the Spindle Speed (RPM):
R
* RPM 509.
* 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 25 smm using a 17 mm bit:
KEYSTROKE DISPLAY
OO
0.
1. Enter the Diameter:
17d
DIA
$
17. MM
2. Enter the Cutting Speed:
25C
CUT
$
25. M/MIN
3. Calculate the RPM:
R
* RPM 468.
* Repeated presses of
R
will toggle through the inputs and outputs,
starting with the entered Cutting Speed.
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