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l SINUMERIK 8T

.Sprint 8T

’ Turning-/Milling Operation

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l SINUMERIK 8TBprint 8T

Turning-/Milling Operation

Edition 7.84

Siemens Aktiengesellschaft

General Chapter 1

Arrangement and Construction Chapter 2

Programming Chapter 3 ~

Operation Chapter 4

SINUMERIK 8T/Sprint 8T Drilling/Milling Operation O-l A.7.84

a 'SINUMERIK @ Documentation

Key to editions

The editions listed below have appeared previous to this latest edition.

Sections which have been modified with respect to the previous edition are marked.

a Edition Order no. Modifications

1.84 E80210-T2 7.84 E80210-T2-X-Al-7600 New edition

SINUMERIK 8T/Sprint 8T Drilling/Milling Operation O-2 A.7.84

CONTENTS

1. 1.1

2.

2.1

2.2

2.2.1

2.3

2.3.1

2.4

2.4.1

2.4.2

3.

3.1

3.2 3.2.1

3.2.2 3.2.3

3.3

3.3.1

3.3.2

3.4 3.4.1

3.4.2

‘4.

4.1 4.1.1

General

Using a lathe for turning and milling operations

Arrangement and construction

Drive and encoder, pulse evaluation for the C-axis

Arrangement of the operator's panel in the 8T/Sprint 8T for

turning/milling operation Switching over the operator's panel by the PC

Software switchover

Spindle encoder and setpoints during milling operation

Possible configuration of the axes

8T/Sprint 8T-Sprint 8M, with analog or digital position

control (MS 230/MS 250)

8T/Sprint 8T-Sprint 8M, with digital position control (MS 250)

Programming

General

G36/G37 coordinate transformation TRANSMIT

G37, coordinate transformation TRANSMIT selected

Programming with TRANSMIT

Application notes Program structure

Example on the structuring of a program

Program example

Handling tool offsets

Special case Using tool length compensation for eccentric cutters

with TRANSMIT

Operation

Display with G37/TRANSMIT Modification of the display system

SINUMERIK 8T/Sprint 8T Drilling/Milling Operation l-l A.7.84

a 1. General

a

The progress made in the automation of chip removing machine

tools has led to extensive optimization of the actual machining

times.

In spite of this however, during manufacturing many parts are

clamped onto a milling machine, where for example prismatic

surfaces or eccentric contours (external poW3ons, eccentrics,

flanges or cylinder grooves) are added after turning.

This results in a significant increase in the machining times due to the additional time required for loading, unloading, clamping

and in some cases aligning of the parts.

The control concept presented here eliminates this additional

time by combining the turning and milling operation on a single

machine which requires only one set-up. This results in a

significantly more cost effective total machining process.

This is achieved by a adding the milling operations listed below

to a turning machine:

. 3 D-Interpolation *

. Cylindrical interpolation

. Coordinate transformation TRANSMIT *

. Cutter radius compensation *

. Machining cycles (drilling and milling patterns) *

0

* Supplement

SINUMERIK 8T/Sprint 8T Drilling/Milling Operation l-2 A.'?.84

1.1 Using the lathe for turning and milling operations 0

Turning Milling

Setp. milling WV Dri.ve for milling sp.

Turning Milling

The characteristic features of a standard lathe are two linear

axes X and Z and a main spindle S. During the milling operation,

the missing Y axis is replaced by the main spindle drive, which

acts as an interpolating rotary axis C. The speed command value

defined by the S address is used in this case by the drive for

the milling head.

The machine can be switched over from turning to milling

operation and vice-versa by operator action or through

programming. Programming is carried out in the t'Turningt'

operating mode, according to the turning machine's programming

instructions. It offers the programming conveniences of a turning

machine control, such as diameter programming, cutter radius

compensation and standard turning cycles. When switching over to

milling operation, the functions of the main spindle are taken

over by rotary axis C which possesses interpolation capability.

The setpoint values defined under the address S are now

associated with the milling spindle. The control is now in the

l'Milling@' operating mode, and is programmed according to the

milling machine programming instructions. In this mode functions

such as 3D-linear interpolation, circular and helical

interpolation, milling and boring' patterns, cylindrical

interpolation and cutter radius compensation are available.

SINUMERIK 8T/Sprint 8T Drilling/Milling Operation 2-l A.7.84

2. Arrangement and construction

2.1 Drive and encoder. pulse evaluation for the C-axis

r ------- 7 f.-- ---------- --------, 1

1 Machine I

i I NC I

Software

(36O.OOOP)

Software

(72O.OOOP)

I I MD N413-522 IICI N260

1 I I I P=Pulse (e) Bit 3

I I I I

-I I

72O.OOOP 1

I I ‘g

--L--,, -I I--------------,--, J $I

Encoder: For a resolution of 0.01 O, the double encoder 6FC9320-

1EA should be used (see appendix).

For a resolution of 0.001 O, encoder ROD 150 or ROD 170

with 18000 pulses and subordinated 5-fold-EXE is

recommended. The maximum velocity of the C-axis is 130

rpm for a resolution of 0.01 ', and 12 rpm for a

resolution of 0.0001 O.

Drive: Main drive for turning and milling with feed control

capability. For higher performance requirements, an additional feed drive can also be coupled mechanically.

Direction determination of the C-axis

The direction of rotation of the milling spindle and tool on page

l-2 shows the relative motion $ Cl. For programming relative to

the part, the direction + C shown on page 10 is valid.

For the main spindle the following direction assignments are

used:

-C’ i% MO3 % Ml9 S...

SINUMERIK 8T/Sprint 8T Drilling/Milling Operation 2-2 A.7.84

2.2 Arrangement of the operator's panel in the 8T/Sprint 8T

for turning/milling operation

Keys 10, 11, 67 and 74 are used.

The operator's panel is rearranged by the PC user program,

depending on the signal "8T/Sprint 8T-software", F26.4. (FB 23)

o The additional operating elements for the C-axis are active

only during the llMilling" operating mode.

o Multiple operation, % ., generates @ . (NC-solution)

2.2.1 Switching over the operator's panel by the PC

The operator's panel keyboard is switched over by the PC program

within the scope of possibilities offered by the flexible

operator's panel. Within the range of standard function blocks available from E

821, a modified function block FB 23 - TASTANNC, is available in

FB-packet 1 for the C-axis operation. The changes in this

modified FB23 are explained on the following pages.


FB 23: TASTANNC

Description

If the "flexible operator's panel" bit is set in the machine data

of the NC, then the signals of the standard keyboard and the keys

from the NC operator's panel are first transmitted to the PC.

These keyboard signals are returned to the NC in the normal case

bY the function block "Transmit keyboard signals to NC”.

Depending on the function for which the keyboard signals are

required in the PC, the transfer of the corresponding keys to the

NC is either suppressed or modified as described below:

Keys for input of display information:

The signals of these keys (addresses %, / etc .; digits 0,l etc.)

as well as the cursor keys are suppressed for the NC, if the

display is used by the PC or if the input SPT is "1". If SPT

is " 1" , the selection of the pictures "Test", "Parts program",

"Tool offset" and "Zero offset" is suppressed by the NC

operator's panel.

Keys for operating modes:

The signals from these keys (AUTO, JOG etc.) are suppressed, if

the operating modes are selected from the PC (e.g. for automatic

program start).

Selecting switch for spindle speed and feed / rapid traverse

override, direction keys and axis selection switch:

The signals are normally entered via the operator's panel of the

NC (Signal "0" at the inputs KPC and APC). Should these signals

be given by the PC (e.g. from a separate machine operator's

panel), then the corresponding signals must be entered directly

before calling FB23 in FW 248 and/or 250 and enabled via inputs

KPC/APC.


If DNC operation is active (interface flag 45.31, then the key DI/O is not transferred to the NC. Furthermore the RESET

pushbutton can,be disabled if the corresponding bit in the state

word (see assignment ZW) is set; RESET can then be entered from

the PC (also via one bit in the status word).

Oberation with the C-axis:

The control operates as far as the hardware is concerned only

with the operator's panel for SINUMERIK 8T. If the software on

the M-version is switched over (M26.5 = 01, then the keys and

switches are rearranged to an M-operator's panel.

SINUMERIK 8T/Sprint 8'1' Drilling/Milling Operation 2-5 A.7.84

. FB 23: TASTANNC

SPB Disable the operating-mode keys for NC

KPC Override switch from PC

ESP Input disable for NC

APC Axis and direction selection

from PC

SPT Disable keyboard signals

FB TASTANNC

UMRA Switchover operator's panel

from R to M E,BI - SPB

KPC '

E,BI - C3/4 Axis number of the C-axis

E,,BI - ESP

c- Minus-direction key, C-axis E,Bl - APC

E,BI - SPT Cf Plus-direction key, C-axis

E,BI -

RT Direction key

KOR Override switches

TAST Input:

Keyboard inputs of the

standard operator's panel

E,BI - c3/4

E,BI - C-

E,BI - c+

MW250 - RT

Mw248 - KOR

output:

Keyboard signals for

the NC

DNCA DNC active

DISP Display for the PC

* * TAST TAST -

*t4 45.3 - DNCA

*M 12.4 - DISP

*M;L38.1 - GST

GST Basic state * fixed parameters

SINLJMERIK 8T/Sprint 8T Drilling/Milling Operation 2-6 A.7.84

FB23 : TASTANNC

SPB The keys and switches for selecting and influencing the NC

operating modes are disabled with "1" signal.

KPC, A "1" signal at the KPC input means that the signals for

KOR spindle, drive and rapid traverse override must be entered

in FW248 (input KOR) - directly before calling FB 23. These

signals are then transferred instead of the NC operator's

panel signals to the NC; Assignment is given in input word

KOR.

ESP Input of NC data and programs from the PC (parallel to the

key switch) can be disabled by a llllt signal at input ESP.

APC, A "1 I, signal at the APC input means that the axis and

RT direction signals must be entered in FW 250 (Input RT) -

directly before calling FB 23. These signals are then

transferred to the NC instead of the signals from the NC

operator's panel.

SPT The transfer of the keyboard signals (address, %, /, etc.,

digits, input, edit, etc., page, cursor, TE, PP, TO and ZO)

to the NC are disabled with by a "1" signal.

GST A II 1 II signal brings the function block to the original

state.

UMRA A "1 II signal at the UMRA input is used depending on flag

26.5 for switching over the 8T operator's panel to an 8M

operator's panel.

C3/4, A "0" signal at input C3/4 is used for switching over the

c-t 3rd axis.

c+ A "1" signal is used for switching over the 4th axis.

DNCA The DI/o switch is not transferred to the NC when "DNC

active".


0 TAST A' tIO1' signal at input SPT causes the.keyboard inputs to be

continuously transferred to the NC. If the signal is "1 II

then they can be transferred from the PC.

D1SP.A II 0 II signal at input DISP is used for disabling the

transfer of those keyboard signals used for selecting or

modifying display information etc. (FB103-110,114), to the

NC.

l


2.3 Software switchover

A handshaking procedure across the NC-PC interface is used for

the switchover from turning to milling operation.

The PC switches the input signal F 01.2 "8T/Sprint 8T-Software".

The switchover is accepted by the NC only in the "RESET state"

(warning 511).

After switchover, the NC acknowledges with the output signal F

26.5.

NC-input: F01.2 = 0 = Sprint 8M-software

F01.2 = 1 = 8T/Sprint 8T-Software

NC-output: F26.5 = 0 = Sprint 8M-Software

F26.5 = 1 = 8T/Sprint 8T-Software

After the Sprint 8M is switched to 8T/Sprint 8T, the signal

"Reference point reached" for the axis to be switched over is

de-activated (The axis number of the switched axis is given by

machine datum 465 bits O-3).

2.3.1 Spindle encoder and setpoints during milling operation

Milling operation with the C-axis offers two possibilities

regarding the main spindle and the milling spindle:

a) Milling spindle without actual value detection

E.g. driven tool in revolver; the milling spindle receives the

setpoint from the NC, the NC however does not receive an

encoder feedback signal from the milling spindle, but from the

main spindle as for turning operation.

However since this is to be operated as a third axis under

position control, one must ensure that:

- the spindle alarms sometimes output by the NC to the PC are not

processed by the PC.

a

-

l

l


The speed setpoint for the main spindle is.switched over to the milling spindle, the main spindle is controlled by the position

setpoint of the 4th. (3rd.) axis. The actual value detection for the main spindle working as a C-axis is carried out by an additional encoder e.g. 9000 pulse-system of the double pulse generator 6FC9320-lEA, connected to the actual value input of the 4th. (3rd.) axis.

During milling operation (switching state 8T/Sprint 8~), the spindle setpoint of the NC is switched again to the main spindle.

The position setpoint of the C-axis is opened and the spindle position encoder (9000 pulse) which is still connected to

x211 of the measurement circuit module remains inactive during the milling state (8T/Sprint 8T).

b) Milling spindle with actual value detection

If high demands are made on the milling spindle, (e.g.oriented spindle stop M19, thread cutting), then the software switchover to Sprint 8M (milling operation) can be implemented by switching over spindle setpoints and actual values of the NC to the milling

spindle as shown in the following recommendation:

MS230 X202 (250)

' Main

spindle

I drive

L Milling spindle

r-l drive

MS230 X207 m (250)

L i --

MS 230 X211 8 (250)

lequirements: o The NC-internal spindle monitoring (machine data

Bit) is not activated.


o Closed-loop control of the milling spindle drive

o Additional spindle sensor on the milling spindle

(1024 pulses per revolution)

o Switchover electronics for sensor


TO

range TO input

in auto

TO tape

read/

punch

I Progr-

amming

Machine

progr.

8T op.

panel §Inout

"8T/Sprint8T software "=Input signal (PC-NC) "8T/Sprint8T software I'=1 "8T/Sprint8T software=O"

NC as 8T/Sprint8T NC as Sprint8M

PC generates signal for PC generates signal for

8T/Sprint8T software=1 8T/Sprint8T software=0

with TO T (F01.2) with TO D (F01.2)

Switch-over only in RESET state (alarm 511)

Tl - T32 (T33) D49 - D99

Dl-D48 not selectable Turning Tl-T32 Milling D49-D99

No Sprint8M offsets can NQ SprintBT offsets can

be entered or changed be entered or changed

The PC generates the input signal "8T/Sprint8T

software=l" in operating mode DIO

Continuous tapes for T,D offsets

Tl - T 32 D 49 - D 99 - As in GT/Sprint8T

See example of machining program

As in Sprint 8M

(TO Dl-D48 unusable)

CYl .-interpol.as in 8MC

Transformation Cartesian

to polar enabled with

G37, disabled with G36

Switching to 8T/Sprint8T

operator's panel % . aenerates 5

Realizec

in:

PC

NC

NC

NC

PC

NC

NC

PC

FE323 NC

NOTE: During commissioning switch on control as Sprint8M

(input21


2.4 Possible configuration of the axes

2.4.1 8T/sprint 8T - sprint 8M with analog or digital position control (MS 230/MS250)

Axis address

1st.

axis

X

2nd. 3rd. axis , axis Z

Interpolation I K parameter

G 19 I Z I

4th.

axis

C

J

C 4

C

Virtual axis 1) (MD 465 Bit O-3) I I

4

Input signal

4th. axis=main axis active

Axis address of the virtual axis 1) C

4th axis // to

(MD 432 Bit O-3) 3rd.axis

1) See section 3.2, coordinate transformation TRANSMIT


l 2.4.2 8T/Sprint 8T-Sprint 8M, with digital position control (MS 250)

(alternative arrangement to 2.4.1)

Axis address

Interpolation

parameter

G 17

G 18

G 19

MD465/3

4th. axis

main axis

Axis address of the

virtual axis 1)

1st.

axis X

I

X

X

l 4th axis // to 3rd axis

(MD 432 Bit O-3)

2nd.

axis - z

K

Z

Z

L

3rd.

axis

C

J

C

C

3

4th.

axis

not active

C

--------------

1) See section 3.2, coordinate Transformation TRANSMIT

SINUMERIK 8T/Sprint 8T Drilling/Milling Operation 3-l A.7.84

0 3. Programming

3.1 General

Turning operations are programmed according to the 8T/Sprint 8T-

Programming Instructions.

Milling operations are programmed according to the Sprint 8M-

Programming instructions, using tool offsets D49 through D99.

A turning machine with its rotary C-axis (main drive), and a

linear X-axis is to be treated as a polar coordinate system when

programming. Especially in outer contour machining of turned

parts, this conceptual approach leads to the upgrading of the

numerical control so that in the case of milling operations it

can be treated as a milling machine as far as programming is

concerned, i.e. in a Cartesian coordinate system. Programming in

Cartesian coordinates and motion in polar coordinates requires

coordinate transformation.

The coordinate transformation allows, for instance, the

programming of an outside rectangle on a turning machine in four

NC blocks, as in any standard milling machine.

3.2 G36/G37, coordinate transformation "TRANSMIT"* For milling operation of the external contours of turned parts on

spot-faces (contouring operation linear axis plus rotary axis).

The TRANSMIT function (transformation milling into turning)

allows contour programming in a "virtual" Cartesian system, while

the motion of the machine occurs in a real polar coordinate

system. This virtual Cartesian coordinate system is constructed

from the 1st. axis X, and from the axis number of the

corresponding rotary axis, as designated under machine datum

465/Bit O-3. The rotary axis is given by address IIC" and the

virtual axis by the symbolical address "Cf". The transformation

is activated and de-activated within the program using the G-

function.

* Supplement


G36 Coordinate transformation de-activated

(Reset State)

The rotary axis is programmed in degrees, the velocity in degrees/min.

3.2.1 G37 Coordinate transformation TRANSMIT selected

Programming is carried out in the virtual Cartesian coordinate system. C is programmed in mm, the velocity in mm/min.

Cartesian 1


Application example: +x

/

Milling of a contour on the transverse plane

% 20 Program part milling *

*

NlOO GO 2200 CO

Coordinate transformation activated with G37

N105 G37 G42 D49 Xl00 Cl00 Gl F5000

Nllo X-100 FlOO

N115 C-100

N120 X+100

N125 Cl00

N130 G42 DO Xl10 Cl10 F5000

Coordinate transformation de-activated with G36

N135 G36 *

*


3.2.2 Programming with TRANSMIT

- The missing axis of the actual virtual plane is substituted

with G17, if only one axis is programmed in the block and if

this axis is an axis of the selected plane (example a and b).

- The control activates alarm 504 if only one axis of the

virtual plane and one axis not belonging to the virtual plane

are programmed (example c).

- Both axes of the virtual plane must be programmed, if further

axes, apart from the axes of this plane, are programmed in the

same block (example d).

Example: G37 active, X -

a) G17 X..

b) G17 Cf..

c) G17 X.. Z..

d) G17 X.. Cf.

e) G17 Z..

Note:

LIF

LIF

L,F

Z . .' LF

LIF

CF = virtual plane = G17 - plane

= Cf is substituted

= X is substituted

= Alarm 504

= No axis substituted

No alarm

= No alarm

The TRANSMIT function is also available for the SINUMERIK 8M. For

details see the programming instructions 8M/8MC/Sprint 8M,

edition 6/83. A software switch-over however, is only possible

between the 8T and the Sprint 8M.


3.2.3 Application notes:

- The cutter centre point must lie on the X-axis, at the turning

centre.

- The control cannot compensate for offsets in the Cf direction.

I - The part zero-point lies at the centre of the transverse axis.

- The transformation must not be switched on or off, if cutter

radius compensations G41/G42 are selected (change from G36 to

G37).

a - The transformation must not be switched on or off within a

contouring block sequence (change from G36 to G37).

- Inch to metric switching are not permitted within the x-Cf

system; the measurements must be entered in metric.

- Rapid traverse movements must be programmed under GO1 or Gll,

with the corresponding F-values.

- The contour velocity is programmed within the X-Cf coordinate

system and is held constant there. Only such X-Cf velocities

are permitted within a circle around the centre of the

0 traverse axis, which produce permissable C-axis angular

velocities. The motion is aborted if these limits are

exceeded.

- When changing from G36 to G37, the actual value of the C-axis

is set to 0 and the actual value of the X-axis is set to the

machine actual value regardless of the current offsets (ZO,

preset, G92). The zero offsets are calculated using the

Cartesian system.

- If the C-axis is used, the accuracy that can be achieved on

the part depends on the actual working radius (the control is

in degrees).


- If too1 change cycles L91/L92 are used. during the turning a operating mode, the tool length offsets of the milling tools used must also be stored in the T-geometry memory.

- Block advance with G37 blocks is not possible

3.3 Program structure

The part programs for the turning operations are clearly separated from those of the milling operations. By linking turning and milling operation programs, a total machining program is generated, and this is executed by a single activation (see

page 3-8). Within the part program, the programmer decides on the next program to be called. A M-function which can be freely selected at the beginning of a part program determines whether it

is a turning or a milling operation. The MO2 M-function

designates the end of a part program, while M30 indicates the end of the total machining program. This type of total machining program allows re-entry into any part program after a too1

break.


3.3.1 Example on the structuring of a program

NC-programming

%lOO(Machining program)

(Turning) Nl M71

N5 G.. G.. F.. X.. 2..

.

N245 %llO

N250 M70 MO2

5110 (Milling)

Nl M70

N2 L999 (or 531)

N260 G.. F.. Z.. C..

.

N525 %120

N530 M71 M02

%llO (Turning)

Nl M71

N540 G..G..F..Z..C..

.

N870 %lOO

N875 M30

PC-functions

* M70 - "RESET" * Signal "8T s/w"=0

* Op.panel 8T-Sprint8M

* C-axis not following

* Ref.pt.C-axis approach

* S-Betpoint to drive

* NC start

* M71 - "RESET"

* C-axis following

* Signal"8T s/w"=1

* op. panel Sprint8M-8T

* S-setpt.- main spindle

* NC start

* PC sets NC in reset

state by M30 without

M70/71

Notes

NC start from op.

* Next prog. no.

* Switchover 8T-

Sprint8M by M70

* Prog.%llO started

For program start

in reset state 8T

alarm 501 generated

without 531

* Next prog. no.

* Switchover Sprint

8M - 8T by M71 * Prog.%120 started

* Prog. no. of start

program

* End machining prog.

(30 w/o M70/71)

Any other optional M-functions can be used for M70/71


Total machining program

Turning operation

% 10

M71

N . . X.. Z.. *

N

%.ZO

X.. Z..

M70

MO2

Milling operation

% 20

M70

Q 31

N . . X.. Z.. C.. *

N. . x . . z . . c. .

% 30 M71

N . . x.. z.. *

Milling operation

% 30

M71

N . . X.. Z.. *

*

N . . X.. Z..

% 10

M 30

No. of the total machining program

Turning and milling

Switch on turning operation

No. of the next part program

End of the part program

No. of the part program

Switch on milling operation

No. of the part program

Switch on turning operation

No of the part program Switch on milling operation

No. of the total machining program

for the next run

End of the total machining program.


3.3.2 Program example:" Milling a contour in the transverse plane"

cutter

% 20 Part program Milling

M70 Switch on milling operation

N5 X.. C.. Z..

*

* Real coordinate system

N50 X.. C.. Z..

N55 GO x 120 CO ZlOO D50 Approach start point Select tool length compensation

N60 G37 GO1 F200 ZOO Switch on transformation block with G37;

programming in the virtual

coordinate system

N65 G42 X90 CO Select the cutter radius compensation

(C corresponds to virtual axis Cf)

l

N70 X40 C40

N75 X-60

N80 GO2 C-40 J-40

N85 GO1 X40

N90 X90 Co

N95 G40 X120

NlOO Zl0t-l

N105 G36

NllO X.. C.. Z..

*

*

Semicircle

De-activate cutter radius compensation

Retract Z axis

Switch off transformation

Real coordinate system


3.4 Handling tool offsets

The tool offsets for the turning and milling operations can be

stored simultaneously in separate memories of the control. For

turning operations, there are 33 offset memories available and

for milling operations there are 51 such memories. All too1

offsets can be punched out and read in at the same time. The operator can enter the tool wear even during machine operation.

* Tool tape format:

To generate a TO tape, it is necessary to first enter the 8T

offsets, and then the Sprint 8M offsets.

% TO

G92 TO1 X.. Z.. B.. A..

G92 T02 X.. Z.. B.. A.. *

*

G92 T31 X., Z.. B.. A..

G92 T32 X.. Z.. E.. A..

G92 D49 D.. E.. G92 D50 D.. B..

*

*

G92 D98 D.. B..

G92 D99 D.. F..

MO2


3.4.1 Special case

When operating with cutters in the X-C plane and with

transformation enabled, the following should be taken into

consideration:

- The reference point on the X-axis must be so defined, that the

cutter centre point always stays at X = 0.

- If the cutters used have different distances from the cutter

centre point to the tool reference point, then it is necessary

to define a different reference point for each cutter I 1.

The function "7 Additional reference points" should be used for

this purpose in the X-axis.

Example: The 1st cutter and the turning tools are related to

the 1st reference point (MD 180). If several cutters are to be

used, the 2nd cutter should be referenced to the 2nd point (MD

3001, the 3rd cutter to the 3rd point and so on rMD3Gl-tiD306).

In the part programs, the selection of reference points is done

by programming a T- or a M-word. The evaluation is carried out by

the PC which automatically generates a reference point approach

in the X-axis.

If several cutters with different distances of the cutter centre

point from the tool's reference point are used in the same

milling operation, then the milling program should be divided

into several part programs depending on the number of cutters

used, (because reference point approach is only possible in the

RESET state).

*) In these cases use of pitch error compensation or

software limit switches is not possible in the X-axis. After software version 03, see section 3.4.2.


3.4.2 Tool length compensation for'eccentric'l milling machines

during TRANSMIT (from software version 03)

This function is extended to include the use of eccentric

"cutters" in the X-axis without the function "7 additional

reference points in the X-axis 'I. Programming of G37 D... can be

used for any required correction number which can be selected

from the tool correction memory. The sum of the geometry and wear

values of the given D values is used for producing a correction

of the current position value of the X-axis, so that the X-axis

has a reference as radius axis referred to the cutter middle

point.

The programming of the combination G37 D... is obligatory.

Example:

Rererence to cutter centr.e

R=@ R=2$35

The correction value is 5 mm.

The function G37 D... can be compared to setting an actual value.

The new actual value is equal to the old actual value plus the

sum of the tool corrections.

When programming G37 DOO, no correction is active. The function

G37 D... should not be used in the first block in the program.


0 4. Operation

Tool offset input in automatic operation:

No sprint 8M offsets can be entered or changed during turning

operations.

During milling operations, no 8T/Sprint 8T offsets can be entered

or changed.

If G37 is selected, then switchover is possible from AUTOMATIC

into the following operating modes:

a - Manual (JOG)

- Step (INC) - MD1

The C-axis is used for the duration of the switchover as a rotary

axis again. When this axis is traversed, the traversing path

appears in the display picture under OFF.

This path must be exactly traversed to zero before switching back

to AUTOMATIC.

4.1 Display for G37/TRANSMIT:

l ACT X.. (11.. (mm) DIF X.. (21.. (mm) Z . . (l).. (mm) Z . . (31.. (mm)

C . . (11.. (0) C . . (21.. (mm)

(1) Actual value in the real system

(2) Setpoint to actual value difference in the virtual

Cartesian system

(3) Setpoint to actual difference in the real system

Display of the actual value system referred to the workpiece is

not possible.

.SINUMERIK 8T/Sprint 8T Drilling/Milling Operation 3-14 A.7.84

4.1.1 Modification of the disolav svstem (from software version 03)

Display of the actual values can optionally be carried out using setting data in the real machine system (SE 2, Bit 3 =l)or in

the virtual Cartesian system.

The following example applies for the virtual Cartesian system

(SE 3, Bit 3 = 0).

Display of G37/TRANSMIT

ACT X... (21.. (mm) DIF X... (41.. (mm)

Z . . . (11.. (mm) Z . . . (31.. (mm)

C . . . (21.. (degree) C... (41.. (mm)

(1) Actual value in the real system

(2) Actual value in the virtual Cartesian system

(3) Setpoint actual value difference in the real system

(4) Setpoint actual value difference in the virtual Cartesian system

The display of the actual value system referred to the workpiece

is possible.

Herausgegeben von Siemens AG, Bereich Steuerungs- und Automatisierungstechnik Postfach 3240,. 8520 Erlangen

Siemens Aktierigesellschaft Subject to change without prior notice Order No. E-60210~T2-X-Al-7600 Printed in the Fed. Rep. of Germany 062 144 PA 0964.5

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