Pin Ø30 · Fanuc and Siemens lathe

Turning + live tools · O2222 and .MPF · CNMEC, small CNC workshop

The part

Machine: lathe with C axis and live tools
Programs: O2222 (Fanuc) · TORNO_SIEMENS_ADAPTATIVO.MPF (Siemens)
Stock: Ø40 × 40 · Z zero on the stock face

Work cycle

Facing 6.5 mm in 3 levels · T02
Turning Ø40 → Ø30.2 · T02
3 off-centre holes Ø3 r12.5 · T08
Centre hole Ø6 · T09
Adaptive pocket · T14
Pocket finishing 3D · T15

Same part, two languages

	Fanuc	Siemens
mm	G21	G71
mm/rev	G99	G95
limit	G50 S	LIMS
face	G12.1	TRANSMIT
drilling	G83	CYCLE83
angle	C-150.	SP1=210.

Cutting data

	rpm	F
T02 turning	107 m/min	0.127/rev
T08 Ø3	2,600	130
T09 Ø6	1,300	130
T14 pocket	5,000	333–1,000
T15 finishing	5,000	600

Same values on Fanuc and Siemens.

Cycle time

Fanuc ≈ 5.3 min
Siemens ≈ 5.1 min

Most of it is the 3D pocket finishing.

Same part, same tools, two controls.

Three holes, one wall

Ø3 at r12.5 in the Ø30.2 pin: 1.1 mm of wall.

G83 / CYCLE83 with 1.5 mm pecks and full retract; C clamped on every hole.

G71 isn't always G71!

Siemens: millimetres (this exercise)
Fanuc: roughing cycle
Okuma: threading cycle (M20 thread)

And M1=3 (Siemens) starts spindle 1, while M1 is optional stop.

Zero is on the stock

Facing goes down to Z-6.5: the finished part starts there.

Every dimension on the part is “-6.5 plus something”. Set Z on the stock face, not the finished one.

Spindle or C axis?

Turning: the part spins (M34, P11 / SETMS(1)).

Drilling/milling: the part is held at an angle and the tool spins (M35, P12 / SETMS(2)).

Before Cycle Start

≥ 40 mm out of the jaws
Z zero on the stock face
T02 · T08 Ø3 · T09 Ø6 · T14 · T15
Siemens: D2 on T2
Live tool up to 5,000 rpm
Sub-spindle at home
First part: single block

Lathe M codes

as this post uses them

M34/M35 spindle · C axis
M89/M90 C brake on · off
M138/M139 high-speed live tool
M24/M25, M110/M111 start · end

G-CODEblock-by-block explanation

Open the program on the control screen, with the reason for every line.