RECALL ON The Roll-over AXES

This Page is drawn mainly from information resulting from the handbook from programming FIDIA. At Fidia there are two orders making it possible to control the Roll-over axes. G14 the axes rollover position while passing by the shortest way - optional functions - modal functions G15 the direction of rotation of the axes rollover depends on the sign of the programmed dimension - optional functions - modal functions - function of rebootstrapping

PROGRAMMING ROLLOVER

To position an axis rollover, it is necessary to program the numerical value (ranging between 0 and 359.999 degrees) which defines the position to be reached inside the angle-turn. If the G14 function is active, the axis rollover reaches the final position while passing by the shortest way, independently of the sign of the programmed dimension. On the other hand, if the G15 function is active, the direction of rotation depends on the sign of the programmed dimension:

Rotation towards the line for the positive sign or lack;

Rotation towards the left for the negative sign.

The G14 function is modal.

The G15 function is modal and of rebootstrapping, it is activated automatically at the end of the program.
 

PROGRAMMING ROLLOVER WITH ACTIVE G15 FUNCTION

1) Absolute (active G90 function):

To obtain the rotation of an axis, it is necessary to program the distance from the zero of the final point to join, expressed in degrees.

2) incremental Programmation (active G91 function):

To obtain the rotation of an axis, the angle should be programmed to be traversed, expressed in degrees.

The sign allotted to the programmed dimension determines the direction of rotation:

feel time for sign "+" or missing

anti-clockwise direction for sign "-"

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EXAMPLE

Rotation of the axis C Significance of the points indicated in the figure: P1 not initial P2 not final
 

To reach P2 while turning in the anti-clockwise direction starting from P1, to program:
C-90. (as well in G90 in G91)
 

To reach P2 while turning clockwise starting from P1, to program:
C90. (with the active G90 function)
or:
C270. (with the active G91 function)
 

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VISUALIZATION OF AXES ROLLOVER

For each axis rollover, there is the visualization of a dimension (always positive and ranging between 000 and 359.999) which expresses the position of the axis even inside the angle-turn. This dimension indicates the distance which it is necessary to traverse in the positive direction of the axis on the basis of the origin to reach the position in which it is.
 

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TEST OF THE AXES

 

 
 
 
 

To program in IMD (Manual entry of data) with Active the G90 mode
 
 

G01 C270 - > the head turns of 270° in the direction (+) - > Programmation unspecified

Then
 
 

G01 C220 - > the head turns of 50° in the directions (-) - > linear Programming or G14

- > the head turns of 310° in the directions (+) - > RollOver G15

G01 C-45 - > the head turns of 265° in the directions (-) - > linear Programming

Position (C 45)

- > the head turns of 85° in the directions (-) - > RollOver G14

Notes:

If Cn does not accept the monkeys (-) on C it east can be a case of programming in G14 (in this case positive sign is enough) But attention this programming method is very dangerous and cannot be used in 5 axes. Normally programming 5 axes comprises many point with an angular value relatively near between two points what can make it possible to machine the course correctly 5 axes (CN always going to shortest). But attention it is as possible as this mode causes collision serious. The risk is especially located in the transitions between two courses.