Scantek 2000 CNC Lathe – First cut with LinuxCNC

I converted my Scantek 2000 CNC lathe to work via Parallel port control (for Mach3/LinuxCNC software control) and have been learning how to hand write gcode (because the Linux compatible CAM lathe software options are not terribly good).

IMG_20160415_220855

Unfortunately, the LinuxCNC   software doesn’t support many of the automated cycles (G71 I’m looking at you!) for lathe turning (yet!), so I had to write up a gcode file with many manual G1 passes to cut down the cone shape you see here.

IMG_20160415_220832

Instead of hand coding the whole thing, I wrote a small python script that automated the gcode generation, which takes 0.2 mm passes off the stock, stopping 0.5mm shorter each time from 10mm down to 5mm radius. But I did the first few by hand….

Here is a video of the process in action:

And below is the full gcode file for those who care….

 

(Lathe Demo)
(Stock dia 20mm, radius 10mm)
(z-zero is 12mm from jaw face minimum)

N100 (Sequence Number)
G18 (X and Z for lathe plane)
M3 S2500 (Start Spindle at 2500 RPM)
G8 (Radius mode)

G0 X10. Z1. (Start position, 10mm out from center, 1mm from face.)
(M1 Optional Stop)
G1 Z-12. F200.
G0 X10.1
G0 X10.1 Z1.

G0 X9.75 Z1.
G1 Z-11.5
G0 X10.1
G0 X10.1 Z1

G0 X9.5 Z1.
G1 Z-11.0
G0 X10.1
G0 X10.1 Z1

G0 X9.25 Z1.
G1 Z-10.5
G0 X10.1
G0 X10.1 Z1

G0 X9.0 Z1.
G1 Z-10.0
G0 X10.1
G0 X10.1 Z1

G0 X8.75 Z1.
G1 Z-9.5
G0 X10.1
G0 X10.1 Z1

G0 X8.5 Z1.
G1 Z-9.0
G0 X10.1
G0 X10.1 Z1

G0 X8.25 Z1.
G1 Z-8.5
G0 X10.1
G0 X10.1 Z1

G0 X8.0 Z1.
G1 Z-8.0
G0 X10.1
G0 X10.1 Z1

G0 X7.75 Z1.
G1 Z-7.5
G0 X10.1
G0 X10.1 Z1

G0 X7.5 Z1.
G1 Z-7.0
G0 X10.1
G0 X10.1 Z1

G0 X7.25 Z1.
G1 Z-6.5
G0 X10.1
G0 X10.1 Z1

G0 X7.0 Z1.
G1 Z-6.0
G0 X10.1
G0 X10.1 Z1

G0 X6.75 Z1.
G1 Z-5.5
G0 X10.1
G0 X10.1 Z1

G0 X6.5 Z1.
G1 Z-5.0
G0 X10.1
G0 X10.1 Z1

G0 X6.25 Z1.
G1 Z-4.5
G0 X10.1
G0 X10.1 Z1

G0 X6.0 Z1.
G1 Z-4.0
G0 X10.1
G0 X10.1 Z1

G0 X5.75 Z1.
G1 Z-3.5
G0 X10.1
G0 X10.1 Z1

G0 X5.5 Z1.
G1 Z-3.0
G0 X10.1
G0 X10.1 Z1

G0 X5.25 Z1.
G1 Z-2.5
G0 X10.1
G0 X10.1 Z1

(Final Exit)
G0 X10.1 Z20

M5 (Stop Spindle)
M30

 

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