I have been adjusting the limit switches on my G4000 lathe. Suddenly I am
getting Joint 0 on limit switch error and Joint 1 on limit switch error when I
try to turn on the spindle. The spindle turns on and then immediately off with
the error messages.
The X limit switch is set at 3.45" so that at 0.0" the tip of the tool is at
X=0.000. The Z limit switch is set at 13.4806"so the tip of the tool at the end
of the jaws on my 3 jaw chuck is Z=0.000". Until the last change this
subroutine was working perfectly. At the point I get the error messages the X
and Z axis are nowhere near the limits.
The last change I made was to flip A+ and A- on the x-axis so that I don’t have
to go in and had edit X-Axis STEP_SCALE to change it to negative every time
that I use pncconf.
Global variables are:
(======================================================================)
(=================== Define Constants/Variables =======================)
#<_xorigin>=[0.0000] ( X axis offset for
Coordinate sys 2 )
( to correct too small diameter add positive value equal to 1/2 error to
#<_xorigin> )
( to correct too large diameter subtract positive value equal to 1/2 error
from #<_xorigin> )
#<_zorigin>=[0.861] ( Z axis offset for
Coordinate sys 2 )
#<_toolnum>=2 ( Set Tool Number )
#<_tooldia>=0.000 ( Set the tool diameter )
#<_toolrad>=[#<_tooldia>/2] ( Tool radius )
#<_cutoffwidth>=0.09375 ( Cutoff Tool Width )
#<_feedrate>=3.5 ( X Feed rate )
#<_plungerate>=1.2 ( Z Feed rate )
#<_finefeed>=1.0 ( Fine Feed rate )
#<_partoffrate>=0.2 ( Part off feed rate )
#<_spindlespeed>=500 ( Spindle Speed )
#<_X_dia>=0.9000 ( Starting Diameter of
Material )
#<_X_rad>=[#<_X_dia>/2] ( Starting Radius )
#<_Xfinish>=0.750 ( Edge of Material )
#<_X_depth>=[[#<_X_dia>-#<_Xfinish>]/2] ( Final Diameter of Material )
#<_Xcut>=0.010 ( X cut depth )
#<_close_X>=0.050 ( Close to X surface )
#<_clear_X>=[#<_X_rad>+#<_close_X>] ( distance to clear X axis at
end )
#<_safe_X>=[#<_X_rad>+#<_close_X>] ( distance to move X for safe
z moves )
#<_Zcut>=0.010 ( Z Cut depth )
#<_Zthick>=0.603 ( Thickness of Material )
#<_ZFace>=0.000 ( Z surface )
#<_Zdepth>=[#<_ZFace>-#<_Zthick>] ( Depth to cut in Z direction
)
#<_close_Z>=0.050 ( Close to top )
#<_safe_Z>=[#<_ZFace>+#<_close_Z>] ( Z clear height )
#<_clear_Z>=1.000 ( Distance for final retract )
#<_sqcorner>=[[SQRT[2]-1]*[#<_toolrad>+0.0001]] ( Offset of Tool radius to
corner )
(#518=[2*[SIN[15]**2]])
(#518=[2*[SIN[15]^2]])
#<_referencetool>=#5063
The subroutine is:
( Turn Outer Surface )
o<TurnOuter> SUB ([1] [2] [3] [4]) ( #1=X Diameter, #2=ZStart,
#3=Xsize, #4=ZLength )
#<Xcut> = [#1/2] ( starting radius )
#<ZStart>=[0.0-#2]
#<Xend> = [#3/2] ( depth to cut to )
#<Zend>=[#<ZStart>-#4]
#<localfeed> = #<_feedrate> ( variable feed rate )
o<L1> DO
m0 (DEBUG, Turn Arbor Stub1 X = [#<Xcut>+#<_close_X>]; Zstart =
[#<ZStart>+#<_close_Z>]; ZEnd = [#<Zend>] ... unpause[S] when ready)
G0 X[#<Xcut>+#<_close_X>] ( move X close to start position
)
Z[#<ZStart>+#<_close_Z>] ( move Z close to start
position )
o<L2> IF [#<Xend> LT [#<Xcut> - #<_Xcut>]] ( set up X cutting position )
#<Xcut> = [#<Xcut>-#<_Xcut>]
o<L2> ELSE
#<Xcut> = #<Xend>
#<localfeed> = #<_finefeed> ( change feed rate for finish
cut )
o<L2> ENDIF
m0 (DEBUG, Turn Arbor Stub2 X = [#<Xcut>]; ZEnd = [#<Zend>] ... unpause[S]
when ready)
G01 X#<Xcut> F#<_finefeed> ( Position for X cut )
Z#<Zend> F#<localfeed> ( Make Z cut )
o<L1> WHILE [#<Xend> LT #<Xcut> ] ( Loop until we cut to depth )
G0 X[#<Xcut>+#<_close_X>] ( move X close to final cut
position )
Z[#<ZStart>+#<_close_Z>] ( move Z close to start
position )
G01 X#<Xcut> F#<_finefeed> ( Position for X spring cut )
Z#<Zend> F#<localfeed> ( Make Z spring cut )
G0 X#<_clear_X> ( Retract X to clear )
G0 Z#<_safe_Z> ( Retract Z to clear )
o<TurnOuter> ENDSUB
The calling sequence is:
m0 (DEBUG, be sure Arbor Stub is sticking out from chuck ... unpause[S] when
ready)
m0 (DEBUG, Mount Turning Tool ... unpause[S] when ready)
T#<_toolnum> M6
m0 (DEBUG, Turn on Spindle ... unpause[S] when ready)
S#<_spindlespeed> M3
m0 (DEBUG, Call TurnOuter ... unpause[S] when ready)
o<TurnOuter> call [#<_X_dia>] [0.0] [0.750] [#<_Zthick>] (Cut probe thread)
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