Jig grinding

Application

On a milling machine, jig grinding will mainly be used for finishing a pre-machined contour with a grinding tool. There is not much of a difference between jig grinding and milling. Instead of a milling cutter, a grinding tool is used, such as a grinding pin or a grinding wheel. Jig grinding produces more precise results and a better surface definition than milling.

Requirements

  • Grinding (#156 / #4-04-1) software option
  • Available kinematics description for jig grinding
  • The machine manufacturer creates the kinematics description.

Description of function

Machining is performed in milling mode, i.e. with FUNCTION MODE MILL.

Grinding cycles provide special movements for the grinding tool. A stroke or oscillating movement, the so-called reciprocating stroke, is superimposed with the movement in the working plane.

Grinding is also possible with a tilted working plane. The tool reciprocates along the active tool axis in the current working plane coordinate system (WPL-CS).

Notes

  • The control does not support block scans while the reciprocating stroke is active.
  • Block scan for mid-program startup

  • The reciprocating stroke continues to be in effect during a programmed STOP or M0 as well as in Single Block mode, even after the end of an NC block.
  • If no cycle has been programmed and a contour is being ground whose smallest inside radius is smaller than the tool radius, the control will display an error message.
  • If you machine with SL cycles, only those areas will be ground that are suitable for the given tool radius. In this case, the resulting contour will not be completely finished and may need to be reworked.

Program structure for jig grinding

Here you see a possible program structure for jig grinding.

BLK FORM...

TOOL CALL...

Dressing of grinding tools (if applicable)

...

; Macro or FUNCTION DRESS

Defining the reciprocating stroke

CYCL DEF 1000 DEFINE RECIP. STROKE

If necessary, explicitly starting the reciprocating stroke

CYCL DEF 1001 START RECIP. STROKE

Machining a contour

CYCL DEF 14 CONTOUR

CYCL DEF 1025 GRINDING CONTOUR

CYCL CALL...

Stopping the reciprocating stroke

CYCL DEF 1002 STOP RECIP. STROKE

...

 
Tip

You can use specific machining cycles (e.g., cycles for grinding, for machining pockets or studs, or SL cycles) to define the contour.