Direct selection/deselection of TRC without block (G239)

The approach motion with G239 is executed immediately as with G138.

When TRC is deselected (G40) the last equidistant point is the current position. A subsequent motion block to reduce the tool radius is not required.

Attention

An arc programmed directly after G40 causes an error message because then the real deselection position and the programmed starting point of the circle are no longer identical.

In the examples below the programmed path is displayed in black and the equidistant path is displayed in blue.

Programing Example

Example 1

Then after TRC is deselected, a position is programmed in both main axes and executed in this way.

%G239_Demo1.nc

N010 G0 X0 Y0 Z0 F1000

N020 G239 (TRC mode)

N030 V.G.WZ_AKT.R = 10

N040 G41 G01 X30 Y20 (Select TRC)

N050 G01 X60

N060 G01 X90

N070 G01 X120

N080 G40 (Deselect TRC without block)

N100 G00 X150 Y0

N110 M30

Motion block sequence of G239_a position in both main axes

Programing Example

Example 2:

Here only one of the main axes is programmed after TRC is deselected. The position of the 2nd main axis remains the same.

%G239_Demo2.nc

N010 G0 X0 Y0 Z0 F1000

N020 G239 (TRC mode)

N030 V.G.WZ_AKT.R = 10

N040 G41 G01 X30 Y20 (Select TRC)

N050 G01 X60

N060 G01 X90

N070 G01 X120

N080 G40 (Deselect TRC without block)

N090 G00 X150

N100 G00 X200

N110 M30

Motion block sequence of G239_only one main axis programmed

Programing Example

Example 3:

When TRC is selected again directly after G40, only one of the two main axes is programmed.

%G239_Demo3.nc

N010 G0 X0 Y0 Z0 F1000

N020 G239 (TRC mode)

N030 V.G.WZ_AKT.R = 10

N040 G41 G01 X30 Y20 (Select TRC)

N050 G01 X60

N060 G01 X90

N070 G01 X120

N080 G40 (Deselect TRC without block)

(Y is not programmed again)

N090 G41 G01 X150 (Reselect TRC)

N100 G00 X200

N110 M30

Programing Example

Example 4:

Here the 2nd motion block is only programmed in the 2nd motion block after TRC is reselected.

%G239_Demo4.nc

N010 G0 X0 Y0 Z0 F1000

N020 G239 (TRC mode)

N030 V.G.WZ_AKT.R = 10

N040 G41 G01 X30 Y20 (Select TRC)

N050 G01 X60

N060 G01 X90

N070 G01 X120

N080 G40 (Deselect TRC without block)

N090 G41 G01 X150 (Reselect TRC)

N100 G00 X200 Y20

N110 M30

Motion block sequence of G239_Program the 2nd main axis in 2nd motion block

Programing Example

Example 5:

In this example the position of second main axis is programmed as for the first selection (G41) after TRC is reselected after G40 .

%G239_Demo5.nc

N010 G0 X0 Y0 Z0 F1000

N020 G239 (TRC mode)

N030 V.G.WZ_AKT.R = 10

N040 G41 G01 X30 Y20 (Select TRC)

N050 G01 X60

N060 G01 X90

N070 G01 X120

N080 G40 (Deselect TRC without block)

N090 G41 G01 X150 Y20 (Reselect TRC)

N100 G00 X200

N110 G40

N120 M30

Motion block sequence of G239_Program the 2nd main axis as for the 1st selection

Programing Example

Example 6:

The arc programmed after TRC is deselected cannot be moved because the specified centre point (M) no longer corresponds to the (new) starting point (S) and the (programmed) end point (E).

%G239_Demo_Kreis.nc

N005 G162

N010 G0 X0 Y0 Z0 F1000

N020 G239 (TRC mode)

N030 V.G.WZ_AKT.R = 30

N040 G41 G01 X30 Y20 (Select TRC)

N050 G01 X60

N060 G01 X90

N070 G40 (Deselect TRC without block)

N080 G02 X140 Y-30 J-50 (Error, centre point not correct)

N100 G00 X200

N110 G40

N120 M30

Motion block sequence of G239_Centre point does not match starting and end points

A message is output with ID 20035.