Siemens CNC Milling | SLOT2 | Circumferential Slot

In this article, we describe how to use SLOT2 to machine circumferential slots arranged on a circle in Siemens CNC controlled milling (machine centre) machines with all details and examples.

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SLOT2 Introduction

The cycle SLOT2 is a combined roughing-finishing cycle. Use this cycle to machine circumferential slots arranged on a circle.

NOTICE: The cycle requires a milling cutter with an “end tooth cutting across center” (DIN844).

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“Siemens CNC Milling | SLOT1 | Slots on a Circle”

Supported CNC Series

Siemens CNC 802D, 810D, 840D, 840D sl, 840Di, 840Di sl series controllers.

SLOT2 Format

SLOT2 (RTP, RFP, SDIS, DP, DPR, NUM, AFSL, WID, CPA, CPO, RAD, STA1, INDA, FFD, FFP1, MID, CDIR, FAL, VARI, MIDF, FFP2, SSF, _FFCP)

Parameters

RTP = Retraction plane (absolute)
RFP = Reference plane (absolute)
SDIS = Safety clearance (enter without sign)
DP = Slot depth (absolute)
DPR = Slot depth relative to the reference plane (enter without sign)
NUM = Number of slots
AFSL = Angle for the slot length (enter without sign)
WID = Circumferential slot width (enter without sign)
CPA = Center point of circle, abscissa (absolute)
CPO = Center point of circle, ordinate (absolute)
RAD = Radius of the circle (enter without sign)
STA1 = Starting angle
INDA = Incrementing angle
FFD = Feedrate for depth infeed
FFP1 = Feedrate for surface machining
MID = Maximum infeed depth for one infeed (enter without sign)
CDIR = Milling direction for machining the circumferential slot ( Values : 2: (for G2); 3: (for G3) )
FAL = Finishing allowance at the slot edge (enter without sign)
VARI = Machining type ; Values :
UNITS DIGIT: Machining process
0: Complete machining
1: Roughing
2: Finishing
TENS DIGIT infeed
0: Positioning from slot to slot on straight line with G0
1: Positioning from slot to slot on circular path with feedrate
MIDF = Maximum infeed depth for finishing
FFP2 = Feedrate for finishing
SSF = Speed when finishing
_FFCP = Feedrate for intermediate positioning on a circular path, in mm/min

SLOT2 Examples

SLOT2 CNC Program Example – 1

Use this program to machine 3 circumferential slots arranged at a circle with center point X60 Y60 and radius 42 mm in the XY plane. The circumferential slots have the following dimensions:

Width 15 mm, angle for slot length 70 degrees, depth 23 mm. The initial angle is 0 degrees, the incremental angle is 120 degrees. The slot contours are machined to a final machining allowance of 0.5 mm, the safety clearance in infeed axis Z is 2 mm, the maximum depth infeed is 6 mm. The slots are to be completely machined. Speed and feedrate must be identical for finishing. The infeed when finishing is to be performed to slot depth.

Siemens CNC Milling SLOT2 Program Example

DEF REAL FFD=100 ; Definition of variables with value assignment
N10 G17 G90 S600 M3 ; Specification of technology values
N15 T10 D1 ;
N17 M6 ; 
N20 G0 X60 Y60 Z5 ; Approach starting position
N30 SLOT2 (2, 0, 2, -23, , 3, 70, 15, 60, 60, 42, , 120, FFD, FFD+200, 6, 2, 0.5) ; Cycle call;Parameters VAR, MIDF, FFP2 and SSF have been omitted
N40 M30 ; Program end


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