X6 Lathe how to make it move in Z first and in X last?

[Darin]

Hello,

 

How do I make Mastercam always post a Z move first to approach the part and X only to exit? I can't get reference points to do this... It always post a X and Z on the same line which is a crash sometimes.. Is there a way to make it go to a certain home position in Z when approaching and the X when exit? I started with MPLmaster post... We have X6

[Allan]

In your post processor there is a post block:

 

pl_retract #Retract tool based on next tool gcode, lathe (see ptoolend)
cc_pos$ = zero
if home_type = one,
[
xh$ = vequ(start_xh)
pmap_home #Get home position, xabs
ps_inc_calc #Set inc.
pbld, n$, psccomp, e$
if css_actv$ & css_end_rpm & not(lathe_stop | synch_flg | n1_gcode = 1003 | n1_posttype <> posttype$ | n1_spindle_no <> spindle_no$),
[
pspindle
prpm
]
pcan1, pbld, n$, *sgcode, pfxout, pfyout, pfzout, [if drop_offset, *toolno], strcantext, e$
if lathe_stop | synch_flg | n1_gcode = 1003 | n1_posttype <> posttype$ | n1_spindle_no <> spindle_no$,
[
pbld, n$, pnullstop, e$
]
]
else,
[
#Retract to reference return
pbld, n$, `sgcode, psccomp, e$
if home_type = m_one & drop_offset, pbld, n$, *toolno, e$
if css_actv$ & css_end_rpm & not(lathe_stop | synch_flg | n1_gcode = 1003 | n1_posttype <> posttype$ | n1_spindle_no <> spindle_no$),
[
pspindle
prpm
]
pcan1, pbld, n$, *sg28ref, "U0.", [if y_axis_mch, "V0."], "W0.", strcantext, e$
if lathe_stop | synch_flg | n1_gcode = 1003 | n1_posttype <> posttype$ | n1_spindle_no <> spindle_no$,
[
pbld, n$, pnullstop, e$
]
if home_type > m_one & drop_offset, pbld, n$, *toolno, e$
]

 

The home_type variable controls if G28 U0. W0. or if the values in the machine def define the home position.

Important point the values in the machine def are world co-ordinates so Z on the lathe is X on the home position and X on the lathe is Y in the home position setting (as a radius value)

 

The first setcion is retracting when X and Z values are used (home_type = 1)

The second is for retracting when G28 U0. W0. is used (home_type = any_thing_but_1)

 

Switching where the pfzout come out or the "W0." arround will affect the output

Example:

 

 

pl_retract #Retract tool based on next tool gcode, lathe (see ptoolend)
cc_pos$ = zero
if home_type = one,
[
xh$ = vequ(start_xh)
pmap_home #Get home position, xabs
ps_inc_calc #Set inc.
pbld, n$, psccomp, e$
if css_actv$ & css_end_rpm & not(lathe_stop | synch_flg | n1_gcode = 1003 | n1_posttype <> posttype$ | n1_spindle_no <> spindle_no$),
[
pspindle
prpm
]
pcan1, pbld, n$, *sgcode, pfxout, pfyout, e$
pcan1, pbld, n$, pfzout, [if drop_offset, *toolno], strcantext, e$
if lathe_stop | synch_flg | n1_gcode = 1003 | n1_posttype <> posttype$ | n1_spindle_no <> spindle_no$,
[
pbld, n$, pnullstop, e$
]
]
else,
[
#Retract to reference return
pbld, n$, `sgcode, psccomp, e$
if home_type = m_one & drop_offset, pbld, n$, *toolno, e$
if css_actv$ & css_end_rpm & not(lathe_stop | synch_flg | n1_gcode = 1003 | n1_posttype <> posttype$ | n1_spindle_no <> spindle_no$),
[
pspindle
prpm
]
pcan1, pbld, n$, *sg28ref, "U0.", [if y_axis_mch, "V0."], e$
pcan1, pbld, n$, "W0.", strcantext, e$
if lathe_stop | synch_flg | n1_gcode = 1003 | n1_posttype <> posttype$ | n1_spindle_no <> spindle_no$,
[
pbld, n$, pnullstop, e$
]
if home_type > m_one & drop_offset, pbld, n$, *toolno, e$
]

 

The approach is a similar edit in the ltlchg postblock.

 

Look for this line:

 

pcan1, pbld, n$, *sgcode, pfxout, pyout, pfzout, pscool, strcantext, e$

 

Allan

[Darin]

That worked for the home position but it still moves in X and Z at the same time.... Below is the code... I have tried ref points no go...

 

 

G28 U0.

G28 W0.

N1 G0 T0101

G18 G99

M24

G97 S312 M03

G0 X2.45 Z.5 <------------------------------- This needs to be only Z move first then it can be X ... This can crash from the home position sometimes...--------------------------------------------------------->

G50 S3500

G96 S200

Z.055

G1 X-.0625 F.01

G0 Z.155

X2.45

Z.01

G1 X-.0625

G0 Z.11

X2.45

Z0.

G1 X-.0625

G0 Z.1

(ROUGHS O.D.)

G0 X2.0506

Z.21

G1 Z.11

Z-3.6812

X2.192 Z-3.6105

G0 Z.21

X1.8512

G1 Z.11

Z-2.99

X1.8575

G3 X2.02 Z-3.0713 R.0812

G1 Z-3.9813

X2.1614 Z-3.9105

G0 Z.21

X1.6518

G1 Z.11

Z-2.99

X1.8575

G3 X1.8712 Z-2.9903 R.0812

G1 X2.0126 Z-2.9196

G0 Z.21

X1.4524

G1 Z.11

Z-2.99

X1.6718

X1.8133 Z-2.9193

G0 Z.21

X1.2531

G1 Z.11

Z-2.99

X1.4724

X1.6139 Z-2.9193

G0 Z.21

X1.0537

G1 Z.11

Z-2.99

X1.2731

X1.4145 Z-2.9193

G0 Z.21

X.8543

G1 Z.11

Z-.0021

X.9863 Z-.0681

G3 X1.0105 Z-.0973 R.0412

G1 Z-2.7543

G3 X1.0305 Z-2.7813 R.0412

G1 Z-2.99

X1.0737

X1.2151 Z-2.9193

(FINISHES O.D.)

G50 S3600

G0 Z.1

X0.

G1 Z0.

X.7959

G3 X.8401 Z-.0092 R.0313

G1 X.9722 Z-.0752

G3 X.9905 Z-.0973 R.0312

G1 Z-2.7583

G3 X1.0105 Z-2.7813 R.0313

G1 Z-3.

X1.8575

G3 X2. Z-3.0713 R.0713

G1 Z-3.95

X2.1414 Z-3.879

G97 S153

G28 U0.

G28 W0.

M01

(TOOL - 7 OFFSET - 7)

(OD THREAD LEFT INSERT - NTC-3L10E)

(MIYANO)

(HEX_CAPSCREW_1.00-8UNCX3.00)

(TURNS 1-8 THREADS)

G28 U0.

G28 W0.

N7 G0 T0707

G18 G99

G97 S200 M03

G0 X1.19 Z.2281

G76 P010060 Q10 R0.

G76 X.8512 Z-2.75 P694 Q214 R0. F.125

G28 U0.

G28 W0.

M05

M30

%

[Manuel0822]

If you always Mastercam to do it that way you'll need to change your post, just as Allan described, look for the line he mentioned on the " ltlchg postblock", pcan1, pbld, n$, *sgcode, pfxout, pyout, pfzout, pscool, strcantext, e$

 

and break it just as you did for the ref return block.

 

Or if you only want to do it on certain Tpaths, ie, you're using the tailstock, then I would just add a couple points to my chain so the tool would follow them as approach moves.

 

HTH

[Darin]

If you always Mastercam to do it that way you'll need to change your post, just as Allan described, look for the line he mentioned on the " ltlchg postblock", pcan1, pbld, n$, *sgcode, pfxout, pyout, pfzout, pscool, strcantext, e$

 

and break it just as you did for the ref return block.

 

Or if you only want to do it on certain Tpaths, ie, you're using the tailstock, then I would just add a couple points to my chain so the tool would follow them as approach moves.

 

HTH

 

 

Great thanks that worked...

[mroy0404]

Darin

 

Could you give alittle more detail on this subject, I would also like to change how our lathe rapids to the face of our parts. We are also using mplmaster for a post processor.

Thank you for any help.