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Programming technology functions (cycles)

9.1 Drilling

Turning

Operating Manual, 01/2015, 6FC5398-8CP40-5BA2

331

9.1.9

Drill and thread milling (CYCLE78)

Function

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.

Clamping the spindle

For ShopTurn, the "Clamp spindle" function can be set up by the machine manufacturer.

Machine manufacturer

Please refer to the machine manufacturer's specifi

cations.

See also

Clamping the spindle (Page 247)

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.

Machine manufacturer

Please also refer to the machine manufacturer's instructions.

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.

Siemens SINUMERIK 828D User Manual

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