Reduce the minimum clearance for DCM with FUNCTION DCM DIST (#140 / #5-03-2)

Application

Some machining steps are by design performed close to a fixture. If Dynamic Collision Monitoring (DCM) is active and the distance between the fixture and tool falls below the defined minimum clearance, the control issues an error message and stops the movement.

To enable using DCM in such machining steps, the control makes the FUNCTION DCM DIST NC function available. This NC function allows reducing the permitted minimum clearance between the tool and the fixture within a NC program.

Requirements

Description of function

When FUNCTION DCM DIST is active, the control displays an icon in the Positions workspace and in the information bar. The Simulation workspace displays the collision objects in question in orange.

The control resets FUNCTION DCM DIST with the following NC functions:

  • FUNCTION DCM DIST RESET
  • M2 or M30

Input

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.

11 FUNCTION DCM DIST FIXTURE1

; Reduce the minimum clearance to 1 mm

To navigate to this function:

Insert NC function All functions Special functions Functions FUNCTION DCM DIST

The NC function includes the following syntax elements:

Syntax element

Meaning

FUNCTION DCM DIST

Syntax initiator for reducing the minimum clearance between the fixture and the tool

FIXTURE or RESET

Reduce the minimum clearance or reactivate the minimum clearance defined by the machine manufacturer

Number or numerical parameter

Input: 0.0000...2.0000

Notes

 
Notice
Danger of collision!
If Dynamic Collision Monitoring (DCM) is deactivated, the control will not perform any automatic collision checking. This means that movements that might cause collisions will not be prevented. There is a risk of collision during all movements!
  1. Make sure to activate DCM whenever possible
  2. Make sure to always re-activate DCM immediately after a temporary deactivation
  3. Carefully test your NC program or program section in Single Block mode while DCM is deactivated
 
Notice
Danger of collision!
The FUNCTION DCM DIST NC function may lead to collisions, such as during CAM-generated short movements near the fixture. Dynamic Collision Monitoring (DCM) does not detect these collisions.
  1. Use FUNCTION DCM DIST only when needed
  2. Set the minimum clearance as small as necessary and as large as possible
  3. Check the simulation with the Fixture collision toggle switch active
  4. As an alternative, prove-out the affected NC program sections in Single Block mode

The control cannot approach the reduced minimum clearance with the RESTORE POSITION function. If the approach position falls short of the minimum clearance defined by the machine manufacturer, the control will display an error message.

Returning to the contour