HEIDENHAIN TNC 640 (34059x-04) - Manual (Page 141)

Cutting data calculator 4.5
4
TNC 640 | User's Manual
HEIDENHAIN Conversational Programming | 3/2014
141
4.5 Cutting data calculator
Application
With the cutting data calculator you can calculate the spindle speed
and the feed rate for a machine process. Then you can load the
calculated values into an opened feed-rate or spindle-speed dialog
box in the NC program.
Do not use the cutting data calculator if you have
programmed the
M136 function. With the M136
function the TNC move the tool at the feed rate
F in millimeters/spindle revolution as specified in
the program, but the cutting data calculator always
calculates feed rate in mm per minute.
You cannot perform any cutting data calculation
in turning mode with the cutting data calculator
because the feed rate and spindle speed data are
different in turning mode from milling mode. During
turning, feed rates are usually defined in mm per
revolution (M136), but the cutting data calculator
always calculates in mm per minute. In addition, the
radius in the cutting data calculator is with respect
to the tool, but turning operations need the tool
diameter.
To open the cutting data calculator, press the CUTTING DATA
CALCULATOR soft key. The TNC shows the soft key if you
open the pocket calculator (CALC key)
open the dialog field for spindle speed input in the TOOL CALL
block
open the dialog field for feed rate input in positioning blocks or
cycles
enter a feed rate in manual operation (F soft key)
enter a spindle speed in manual operation (S soft key)
The cutting data calculator is displayed with different input fields
depending on whether you calculate a spindle speed or a feed rate:
Window or spindle speed calculation:
Code letter Meaning
R: Tool radius (mm)
VC: Cutting speed (m/min)
S= Result for spindle speed (rev/
min)