I'm running an Orac via Mach3 control, and I have 'transposed' (hand typed) the pawn piece as close as you can be from the written crib sheet from the Orac Manual into Mach3 version of G-Code. I worked out the coding and how to do the subroutines (old orac name 'Do xxx ' end 'do' etc) - and the visual representation on Mach 3 mimics nicely the drawing in the Orac brochure ... but the cut depths seem very scary as do the feed speeds.... scary enough to stall the motor on the lathe and cause me to 'whack the big red stop button'!!!

Surely the original Orac manual values are right??

Has anyone had a similar experience (or has anyone copied the official chess piece onto an Orac and made one successfully?

Yes I know I could put the outline of the chess piece into CAD and let the PC work it out for me, but half of the intended fun was hoping to see the lathe make a chess piece as it would have been when used back when it was released.

G-Code; if someone wants to try it on their machine: (Though I suggest free air cutting first!!!):

My tooling is set up as follows:

T0101 (tool 1) = 'copy tool 56deg tip (Orac manual = tool 2)

T0303 (tool 3) = 'R-H Turning tool 56deg tip (Orac manual = tool 1)

T0505 (tool 5) = 'L-H Turning tool 56deg tip (Orac manual = tool 4)

Parting off is (well would be if I got that far) by hand with a saw as I haven't yet set up the parting tool in the tool changer..

Mach3 is running in Radius mode, units of measurement = mm...

Code: Select all

```
G18 G21 G50 G80 G90 G94 (written in radius mode) (G90=Absoloute, G91=incrimental)
(Bar stock size 25.4mm x 70mm - mild steel)
T0303
F1000
G01 X15 Z5
M03 S1500 G04 P5
G91
F1000 X-2 Z-4
M98 P1 Q4
S1200
F1000 X-0.5 Z0.2
M98 P2 Q4
F1000 X-0.98
M98 P3 Q3
F1000 Z-4.8
M98 P4 Q2
G90
F1000 X3.4 Z-0.8
F100 X4.51 Z-4.6
F1000 X3.4 Z-0.8
F1000 X2.3
F100 X4.3 Z-3.5
F1000 X2.3 Z-0.8
F1000 X0 Z-0.85
F80 G02 X4.54 Z-5.39 R-4.44
F100 G01 X3.7 Z-9.7
F1000 X4.6 Z-6
F100 X2.8 Z-9.5
F100 X6.1 Z-11.5
F100 X6.1 Z-12.7
F60 X5.1 Z-14.4
F100 X5.1 Z-25
F1000 X5.1 Z-14.4
F100 X4.1 Z-16.3
F100 X4.1 Z-22.5
F1000 X4.1 Z-16.3
F100 X3.2 Z-18
F80 X3.6 Z-22.5
F200 X4.7 Z-22.5
F100 X4.7 Z-24.5
F100 X9.2 Z-32.5
F1000 X10 Z0
F1000 X0 Z-0.5
F30 X0 Z-1.05
F100 G02 X4.34 Z-5.39 R-4.34
F100 G02 X4 Z-6.5 R-2
F100 G01 X2.5 Z-9.5
F100 X5.8 Z-11.5
F80 G02 X5.8 Z-12.5 R-2
F100 G01 X3 Z-18
S1000 G04 P5
F100 X3.5 Z-22.5
F200 X4.15 Z-22.5
F100 X4.5 Z-22.85
F100 X4.5 Z-24.5
F100 X8.9 Z-32.3
F100 X9 Z-32.6
F100 X9 Z-39
F1000 X10 Z-39
F1200 X15 Z5
S1600
T0101
F1200 X10 Z-33.5
F100 X9 Z-33.5
F25 X8.3 Z-33.5
S1000 G04 P5
F900 X10 Z-33.5
F1200 X15 Z5
S1200
T0505
F1200 X10 Z-15
F900 X5.1 Z-15
F80 X5.1 Z-12.4
F1000 X5.1 Z-15
F1000 X4.1 Z-17
F80 X4.1 Z-12.4
F1000 X4.1 Z-17
F100 X3.2 Z-18.5
F60 X2.7 Z-12.4
F1000 X3.2 Z-18.5
F60 X3 Z-18
F100 X2.5 Z-12.4
F400 X10 Z-12.4
F1200 X30 Z5
F1200 X10 Z-36.6
F80 X7.5 Z-36.6
F1200 X10
F1200 X15 Z5
M30
O1
F1000 Z-0.5
F80 X-13
F1000 X13
M99
O2
F1000 X-0.83
F100 Z-39
F1000 Z39
M99
O3
F100 Z-29.8
F1000 Z29.8
F1000 X-1 Z1.6
M99
O4
F100 Z-10.1
F1000 Z10.1
F1000 X-0.75 Z0.5
M99
```