HEIDENHAIN TNC 640 User Manual page 112

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Fixed Cycles: Drilling | SINGLE-LIP DEEP-HOLE DRILLING (Cycle 241, DIN/ISO: G241)

Q427 Spindle speed of entry/exit?: Rotational

speed at which the tool is to rotate when moving

into and retracting from the hole. Input range 0 to

Q428 Spindle speed for drilling?: Desired speed

for drilling. Input range 0 to 99999

Q429 M function for coolant on?: Miscellaneous

function M for switching on the coolant. The TNC

switches the coolant on if the tool is in the hole at

Q379 STARTING POINT. Input range 0 to 999

Q430 M function for coolant off?: Miscellaneous

function M for switching off the coolant. The TNC

switches the coolant off if the tool is at Q201

DEPTH. Input range 0 to 999

Q435 Dwell depth? (incremental): Coordinate in

the spindle axis at which the tool is to dwell. If

0 is entered, the function is not active (standard

setting). Application: During machining of through-

holes some tools require a short dwell time before

exiting the bottom of the hole in order to transport

the chips to the top. Define a value smaller than

Q201 DEPTH, input range 0 to 99999.9999.

Q401 Feed rate factor in %?: Factor by which the

TNC reduces the feed rate after the Q435 DWELL

DEPTH has been reached. Input range 0 to 100

Q202 Maximum plunging depth? (incremental):

Infeed per cut Q201 DEPTH does not have to be a

multiple of Q202. Input range 0 to 99999.9999

Q212 Decrement? (incremental): Value by which

the TNC decreases Q202 MAX. PLUNGING DEPTH

after each infeed. Input range 0 to 99999.9999

Q205 Minimum plunging depth? (incremental):

If you have programmed Q212 DECREMENT the

TNC limits the infeed to Q205. Input range 0 to

HEIDENHAIN | User's manual for cycle programming | 10/2017