Drill And Thread Milling (Cycle78) - Siemens SINUMERIK Series Operating Manual

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Drill and thread milling (CYCLE78)

You can use a drill and thread milling cutter to manufacture an internal thread with a specific

depth and pitch in one operation. This means that you can use the same tool for drilling and

thread milling, a change of tool is superfluous.

The thread can be machined as a right- or left-hand thread.

Approach/retraction

1. The tool traverses with rapid traverse to the safety clearance.

2. If pre-drilling is required, the tool traverses at a reduced drilling feedrate to the predrilling

depth defined in a setting data (ShopMill/ShopTurn). When programming in G code, the

predrilling depth can be programmed using an input parameter.

1. The tool bores at drilling feedrate F1 to the first drilling depth D. If the final drilling depth Z1

is not reached, the tool will travel back to the workpiece surface in rapid traverse for stock

removal. Then the tool will traverse with rapid traverse to a position 1 mm above the drilling

depth previously achieved - allowing it to continue drilling at drill feedrate F1 at the next

infeed. Parameter "DF" is taken into account from the 2nd infeed and higher (refer to the

table "Parameters").

2. If another feedrate FR is required for through-boring, the residual drilling depth ZR is drilled

with this feedrate.

3. If required, the tool traverses back to the workpiece surface for stock removal before thread

milling with rapid traverse.

4. The tool traverses to the starting position for thread milling.

5. The thread milling is carried out (climbing, conventional or conventional + climbing) with

milling feedrate F2. The thread milling acceleration path and deceleration path is traversed

in a semicircle with concurrent infeed in the tool axis.

Operating Manual, 08/2018, 6FC5398-7CP41-0BA0

Machine manufacturer

Please refer to the machine manufacturer's specifications.

Machine manufacturer

Please also refer to the machine manufacturer's instructions.

Programming technological functions (cycles)

10.1 Drilling