Lathe OD Turning

Hello John,

Has the file www.linuxcnc.org/www.linuxcnc.org/media/kunena/attachment...3ae267fd15d6a555.txt been moved or renamed? :unsure:

Rick G

Hello Rich,

Your address is bad (<br%20/>?!), you are looking for : www.linuxcnc.org/media/kunena/attachment...3ae267fd15d6a555.txt ?

Xavier

Thanks John, hope to try this weekend.

Rick

Hello John,

Thanks for posting your subs. I was using your od sub the other day and I wondered if it could be modified to use existing part files. Perhaps to run the same part from different stock sizes.

The below assumes a G92 to set work piece.
I made the part file testrun.ngc a sub by adding the 0<testrun> sub and o<testrun> endsub to it.

Below is untested, and a possible starting point, what do you think?

; 100717:10.32 john thornton
; adapt for ngcgui format by:
; 1. making a subroutine with positional parms
; 2. shorten some names for visibility in gui

;; modify to use existing part file
;; final diameter is smallest diameter of smallest section of part

o<od4> sub
#<Material_Dia> = #1 (=2.000 Material Diameter)
#<Final_Dia> = #2 (=1.500 Final Diameter)
#<Depth_Cut> = #3 (=0.010 Depth of Cut)
#<Final_Cut> = #4 (=0.000 Final Cut)
#<SurfaceSpeed> = #5 (=100 Surface Speed)
#<FeedRate> = #6 (=2 Feed Rate)
#<Max_RPM> = #7 (=1500 Max Spindle RPM)
#<Z_EndOfCut> = #8 (=-0.5 End of Cut)
#<Z_StartOfCut> = #9 (=0.100 Start of Cut)
#<RToolNumber> = #10 (=3 Roughing Tool)
#<FToolNumber> = #11 (=3 Finishing Tool)
#<Coolant> = #12 (=8 Flood=8, Off=9)
;;
#<Cut-Depth> = #13 (=1.000 Deepest Cut)
#<Mat_plus> = #14 (=3.000 Material Plus)


T#<RToolNumber> M6
G43 G7 G96 D#<Max_RPM> S#<SurfaceSpeed>
;G7
F#6
M3 M#<Coolant>

;; add depth of deepest cut to Material diam
#14=[#13+#<Material_Dia>]
G0 X#14 Z#<Z_StartOfCut>

o100 while [#14 gt #<Material_Dia>]

O101 if [[#14-#<Depth_Cut>] gt #<Final_Dia>]
#14=[#14-#<Depth_Cut>]
O101 else
#14=#<Material_Dia>
O101 endif

;;reset cord system
G10 L2P1 X#14
;; go to sub program

o<testrun> call

G0 X#14
G0 Z#<Z_StartOfCut>

o100 endwhile

M5 M9
G0 Z#<Z_StartOfCut>
G49

o<od4> endsub


The testrun program could be ....

o<testrun> sub
G0 X2.00
G0 Z0.00
G1 X1.5
G1 Z-.5
G1 X1.75
G1 Z-.75
G1 X2.00 Z-1.25

o<testrun> endsub

John,

Sort of a G71 with a gui?

If I have a finish path for a part that I want to run I am setting a start position to work down to it by the entered maximum cut per pass.
I am re setting the machine position with G10 each pass until done. Been up about 4 hours now.

Rick G

Exactly.
Does the same thing as your od sub but a more complex shape is possible that is contained in another sub.
I believe G71 is a roughing routine in other interfaces and I believe someone might be working on it for EMC.

Rick