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PMAC 2 Software Reference

228 PMAC On-Line Command Specification

See Also

Following Error (Servo Features)

I-variables Ix11, Ix12, Ix67

On-line commands <CTRL-F>, P, V

Suggested M-variable definitions Mx61, Mx62

Memory map registers D:$0028, D:$002C, etc.; D:$0840, etc.

FRAX

Function

Specify the coordinate system’s feedrate axes.

Scope

Coordinate-system specific

Syntax

FRAX

FRAX({axis}[,{axis}...])

where:

• {axis} (optional) is a character (X, Y, Z, A, B, C, U, V, W) specifying which axis is to

be used in the vector feedrate calculations

Note:

No spaces are permitted in this command.

Remarks

This command specifies which axes are to be involved in the vector-feedrate (velocity)

calculations for upcoming feedrate-specified (F) moves. PMAC calculates the time for these

moves as the vector distance (square root of the sum of the squares of the axis distances) of

all the feedrate axes divided by the feedrate. Any non-feedrate axes commanded on the same

line will complete in the same amount of time, moving at whatever speed is necessary to

cover the distance in that time.

Vector feedrate has obvious geometrical meaning only in a Cartesian system, for which it

results in constant tool speed regardless of direction, but it is possible to specify for non-

Cartesian systems, and for more than three axes.

Note:

If only non-feedrate axes are commanded to move in a feedrate-

specified move, PMAC will consider the axis or axes commanded to

be feedrate axes for that move. However, the units of these axes may

be completely different from those of the vector feedrate axes (e.g.

degrees instead of mm), so the speed may not be what is desired.

If a motion program buffer is open when this command is sent to PMAC, it will be entered

into the buffer for later execution.

For instance, in a Cartesian XYZ system, if you use FRAX(X,Y), all of your feedrate-

specified moves will be at the specified vector feedrate in the XY-plane, but not necessarily

in XYZ-space. If you use FRAX(X,Y,Z) or FRAX, your feedrate-specified moves will be at

the specified vector feedrate in XYZ-space. Default feedrate axes for a coordinate system are

X, Y, and Z.

Example

FRAX.................. ; Make all axes feedrate axes

FRAX(X,Y)...... ; Make X and Y axes only the feedrate axes

FRAX(X,Y,Z) ; Make X, Y, and Z axes only the feedrate axes