How to change arc mode

Sometimes from your controller you may receive this kind of error message :

"radius to end of arc differs from radius to start"  

The first thing to check , is to have the same "arc center mode" both in controller and in post processor.

Depending on controller configuration , you need to define the arc center point in one of this way : 

• as the distance from arc startpoint
  
• as the distance from arc endpoint
  
• or in absolute coordinate.

To edit this , open the post processor dialog and search for "Arc Incremental Mode" , you can choose between from the 3 method above.

Define arc radius instead of center point

If after trying the method above , you still get issue , you can try to write the arc movement defining just end point and arc radius values.

To do so , edit the [Arc Move] template from post processor.

In case of lathe , the default template is :

{MOVE_MODE}{COMP_CODE}{COO_X_DIA}{COO_Z} {ARC_I}{ARC_K}{FEED_CODE}

edit this template to this :

{MOVE_MODE}{COMP_CODE}{COO_X_DIA}{COO_Z} {ARC_RADIUS}{FEED_CODE}

In other word, substitute the {ARC_I}{ARC_K} tags with {ARC_RADIUS} tag.

Convert arc movement in linear movement 

If you have a very old machine (or very dumb machine) that can't handle arc movement, is possible convert them in a list of linear G1 movements.

To do so , search and enable "Break Arc Movement into linear movement" .

Edit the related properties "Arc Linearization Chord Error" to adjust the quality of linearized arc.