Cycle 427 MEASURE COORDINATE (#17 / #1-05-1)

ISO programming

G427

Application

Touch probe cycle 427 measures a coordinate in a selectable axis and saves the value in a Q parameter. If you define the corresponding tolerance values in the cycle, the control makes a nominal-to-actual value comparison and saves the deviation values in Q parameters.

 
Tip

Instead of Cycle 427 MEASURE COORDINATE, HEIDENHAIN recommends using the more powerful Cycle 1400 POSITION PROBING.

Cycle run

  1. The control positions the touch probe to the pre-position of the first touch point 1, using positioning logic.
  2. Positioning logic

  3. Then the control positions the touch probe to the specified touch point 1 in the working plane and measures the actual value in the selected axis.
  4. Finally, the control returns the touch probe to the clearance height and saves the measured coordinate in the following Q parameters:

Q parameter
number

Meaning

Q160

Measured coordinate

Q168

Deviation of the measured coordinate

Notes

  • This cycle can be executed only in the FUNCTION MODE MILL machining mode.
  • If an axis of the active working plane is defined as the measuring axis (Q272 = 1 or 2), the control will perform a tool radius compensation. The control determines the direction of compensation from the defined traversing direction (Q267).
  • If the touch probe axis is defined as the measuring axis (Q272 = 3), the control will perform a tool length compensation.
  • The control will reset an active basic rotation at the beginning of the cycle.

Notes on programming

  • Before defining this cycle, you must have programmed a tool call to define the touch probe axis.
  • The measuring height Q261 must be between the minimum and maximum dimension (Q276/Q275).
  • Parameters Q498 and Q531 have no effect in this cycle. You do not need to make any entries. These parameters have only been integrated for reasons of compatibility. If, for example, you import a program of the TNC 640 turning and milling control, you will not receive an error message.

Cycle parameters

Help graphic

Parameter

Q263 1st measuring point in 1st axis?

Coordinate of the first touch point in the main axis of the working plane. This value has an absolute effect.

Input: –99999.9999...+99999.9999

Q264 1st measuring point in 2nd axis?

Coordinate of the first touch point in the secondary axis of the working plane. This value has an absolute effect.

Input: –99999.9999...+99999.9999

Q261 Measuring height in probe axis?

Coordinate of the ball tip center in the touch probe axis in which the measurement will be performed. This value has an absolute effect.

Input: –99999.9999...+99999.9999

Q320 Set-up clearance?

Additional distance between touch point and ball tip. Q320 is active in addition to the SET_UP column in the touch probe table. This value has an incremental effect.

Input: 0...99999.9999 or PREDEF

Q272 Meas. axis (1/2/3, 1=ref. axis)?

Axis in which the measurement will be made:

1: Main axis = measuring axis

2: Secondary axis = measuring axis

3: Touch probe axis = measuring axis

Input: 1, 2, 3

Q267 Trav. direction 1 (+1=+ / -1=-)?

Direction in which the touch probe will approach the workpiece:

–1: Negative traverse direction

+1: Positive traverse direction

Input: –1, +1

Q260 Clearance height?

Coordinate in the tool axis at which no collision between touch probe and workpiece (fixtures) can occur. This value has an absolute effect.

Input: –99999.9999...+99999.9999 or PREDEF

Q281 Measuring log (0/1/2)?

Define whether the control will create a measuring log:

0: Do not create a measuring log

1: Create a measuring log: The control will save the log file named TCHPR427.TXT in the folder that also contains the associated NC program.

2: Interrupt the program run and display the measuring log on the control screen.Resume the NC program run with NC Start.

Input: 0, 1, 2

Q288 Maximum limit of size? (optional)

Maximum permissible value

Input: –99999.9999...+99999.9999

Q289 Minimum limit of size? (optional)

Minimum permissible value

Input: –99999.9999...+99999.9999

Q309 PGM stop if tolerance exceeded? (optional)

Define whether in the event of a violation of tolerance limits the control will interrupt program run and output an error message:

0: Do not interrupt program run; no error message

1: Interrupt program run and output an error message

Input: 0, 1

Q330 Tool for monitoring? (optional)

Define whether the control should perform tool monitoring:

0: Monitoring not active

> 0: Number or name of the tool used for machining. Via selection in the action bar, you have the option of applying a tool directly from the tool table.

Input: 0...99999.9 or max. 255 characters

Tool monitoring

Parameters Q498 and Q531 have no effect in this cycle. You do not need to make any entries. These parameters have only been integrated for reasons of compatibility. If, for example, you import a program of the TNC 640 turning and milling control, you will not receive an error message.

NC programs contained in this User's Manual are suggestions for solutions. The NC programs or individual NC blocks must be adapted before being used on a machine.

Change the following contents as needed:

  • Tools
  • Cutting parameters
  • Feed rates
  • Clearance height or safe position
  • Machine-specific positions (e.g., with M91)
  • Paths of program calls

Some NC programs depend on the machine kinematics. Adapt these NC programs to your machine kinematics before the first test run.

In addition, test the NC programs using the simulation before the actual program run.

 
Tip

With a program test you determine whether the NC program can be used with the available software options, the active machine kinematics and the current machine configuration.

Example

11 TCH PROBE 427 MEASURE COORDINATE ~

Q263=+35

;1ST POINT 1ST AXIS ~

Q264=+45

;1ST POINT 2ND AXIS ~

Q261=+5

;MEASURING HEIGHT ~

Q320=+0

;SET-UP CLEARANCE ~

Q272=+3

;MEASURING AXIS ~

Q267=-1

;TRAVERSE DIRECTION ~

Q260=+20

;CLEARANCE HEIGHT ~

Q281=+1

;MEASURING LOG ~

Q288=+5.1

;MAXIMUM LIMIT ~

Q289=+4.95

;MINIMUM LIMIT ~

Q309=+0

;PGM STOP TOLERANCE ~

Q330=+0

;TOOL ~

Q498=+0

;REVERSE TOOL ~

Q531=+0

;ANGLE OF INCIDENCE