SINGLETHREAD - Single-pass thread

Command caption

How the command appears in the CLData command list:

SINGLETHREAD OD(0) | ID(1) | FACE(2), STEP(0) | COUNT(1), s, ANGLE a

SINGLETHREAD command is used in continuous cylindrical or conical thread cutting with constant step by a lathe tool. Commonly this is the G32 or G33 G-codes in NC-programs.

f_clip0028

When the threading mode is activated the tool movement and spindle rotation synchronization mode is activated. All following movements of the tool are performed in this mode until feed rate change (FEDRAT) command or rapid travel (RAPID) command is received. If the tool is traveling along the spindle axis then cylindrical thread is formed. If the tool is traveling along the spindle axis and also perpendicular to it then conical thread is machined. It is possible to machine a face thread by moving the tool only perpendicularly to the spindle axis.

SINGLETHREAD command parameters define the threading orientation, the thread pitch and the spindle start angle.

There are two ways to specify the thread pitch: by specifying the value of the pitch, or by specifying the number of thread turns per length unit.

Spindle start angle is specified in degrees and defines the angle that is laid off the zero signal of the spindle probe before thread cutting. Specify different angle values for different passes to machine multi-start thread.

Access from sppx

Handler: program SingleThread

Parameter CLD array CLD name Description
OD(0)
ID(1)
FACE(2)		 CLD[1] CLD.Orientation Threading orientation: OD(0) – external, ID(1) – internal, FACE(2) – face.
STEP(0)
COUNT(1)		 CLD[2] CLD.IsCount Thread pitch defining: STEP(0) – value, COUNT(1) – number of thread turns per length unit.
s CLD[3] CLD.Value Thread pitch value.
a CLD[4] CLD.StartAngle Spindle start angle (for multiple-start thread).

Example (from the Fanuc (30i)_Mill postprocessor):

program SingleThread
  Feed_ = cld[3]; Feed_@ = MaxReal
  QStartAngle = cld[4]; QStartAngle@ = MaxReal
  Interp_ = 33; Interp_@ = MaxReal
end

Access from .NET

Handler:

public override void OnSinglePassThread(ICLDSinglePassThreadCommand cmd, CLDArray cld)

Inheritance: ICLDSinglePassThreadCommand : ICLDCommand.

Read the parameters from the strongly-typed cmd object (recommended); the raw cld[i] array (same indices as in sppx) and the named cmd["..."] helpers are available too. The table lists the command's members, including those inherited from its base interfaces; the common ICLDCommand members (navigation, CLD, CLDFile, TechOperation, ...) are described in the CLData access model.

Member Type Description
cmd.Orientation CLDThreadOrient Thread orientation (OD, ID, Face)
cmd.IsODThread bool Returns "True" if it's an external thread cutting command.
cmd.IsIDThread bool Returns "True" if it's an internal thread cutting command.
cmd.IsFaceThread bool Returns "True" if it's a face thread cutting command.
cmd.Units CLDThreadUnits Thread pitch units (mm or TPI).
cmd.StepIsDistance bool Returns "True" if thread pitch specified in a linear units (usually in mm).
cmd.StepIsTPU bool Returns "True" if thread pitch specified as a Threads per units (usually as threads per inch).
cmd.Step double Thread pitch value.
cmd.StartAngle double Thread start angle in degrees. Frequently can be used for a multi-start threads.

Example - OnSinglePassThread (from the Goodway SW postprocessor):

public override void OnSinglePassThread(ICLDSinglePassThreadCommand cmd, CLDArray cld)
{
        nc.GInterp.v = 32;
        if (cmd.StepIsTPU)
            nc.F.v = 1.0/cmd.Step;
        else
            nc.F.v = cmd.Step;
        nc.QThreadAngle.v = cmd.StartAngle;
        nc.QThreadAngle.v0 = 0;
}

See also