Vectirc question. Bit of G-Code help please

Just a quick one,

if you use vectric you may be able to answer this or even if you know your GCode.

I export the GCode as NC files because I use NCStudio on the machine.

What is happening is, the file cuts fine but it goes to the "machine" 0 point first and then returns to the work piece origin to start the job, this means that if I start a job anchored down in the middle of the bed it still goes off to the far corner before coming back. I do some small stuff that really only do a single hole or small pocket and it takes longer to go to the 0 point and then back than to finish off the job.

So I've post ed the first 20 lines or so of code below, to see if any one knows what I need to take out so the job basically starts from the work piece origin.

o0001
( smallbox_recess_2 )
N20 G91 G28 X0.000 Y0.000 Z3.001
N30 G00 G21 G17 G90
N40 G00 G40 G49 G80
N50 G71
N60 T1 M06
N70 G00 G43Z3.001H1 M8
N80 S12000 M03
N90 X0.000 Y0.000 F3600.0
N100 G00 X-27.650 Y-78.650 Z3.000
N110 G01 Z-3.000 F1200.0
N120 G01 X-25.350 F3600.0
N130 G01 Y-25.350
N140 G01 X-27.650
N150 G01 Y-78.650
N160 G01 X-30.050 Y-81.050
N170 G01 X-22.950
N180 G01 Y-22.950
N190 G01 X-30.050
N200 G01 Y-81.050
N210 G01 X-32.450 Y-83.450
N220 G01 X-20.550
N230 G01 Y-20.550
N240 G01 X-32.450
N250 G01 Y-83.450
N260 G01 X-34.850 Y-85.850
N270 G01 X-18.150
N280 G01 Y-18.150
N290 G01 X-34.850
N300 G01 Y-85.850
N310 G01 X-37.250 Y-88.250
N320 G01 X-15.750
N330 G01 Y-15.750
N340 G01 X-37.250
N350 G01 Y-88.250
N360 G01 X-39.650 Y-90.650
N370 G01 X-13.350
N380 G01 Y-13.350
N390 G01 X-39.650
N400 G01 Y-90.650
N410 G01 X-42.050 Y-93.050
N420 G01 X-10.950
N430 G01 Y-10.950
N440 G01 X-42.050
N450 G01 Y-93.050
N460 G01 X-44.450 Y-95.450
N470 G01 X-8.550
N480 G01 Y-8.550
N490 G01 X-44.450
N500 G01 Y-95.450
N510 G01 X-46.850 Y-97.850
N520 G01 X-6.150
N530 G01 Y-6.150
N540 G01 X-46.850
N550 G01 Y-97.850
N560 G01 X-49.250 Y-100.250
N570 G01 X-3.750
N580 G01 Y-3.750
N590 G01 X-49.250
N600 G01 Y-100.250
N610 G00 Z3.000
N620 G00 Z3.000
N630 S12000 M03
N640 G00 X-26.750 Y-50.050 Z3.000
N650 G01 Z-6.250 F1200.0
N660 G03 X-26.450 Y-49.750 I0.000 J0.300 F3600.0
N670 G03 X-26.750 Y-49.450 I-0.300 J0.000
N680 G03 X-27.050 Y-49.750 I0.000 J-0.300
N690 G03 X-26.750 Y-50.050 I0.300 J0.000
N700 G01 Y-52.450
N710 G03 X-24.050 Y-49.750 I0.000 J2.700
N720 G03 X-26.750 Y-47.050 I-2.700 J0.000
N730 G03 X-29.450 Y-49.750 I0.000 J-2.700
N740 G03 X-26.750 Y-52.450 I2.700 J0.000
N750 G01 Y-54.850
N760 G03 X-21.650 Y-49.750 I0.000 J5.100
N770 G03 X-26.750 Y-44.650 I-5.100 J0.000
N780 G03 X-31.850 Y-49.750 I0.000 J-5.100
N790 G03 X-26.750 Y-54.850 I5.100 J0.000
N800 G01 Y-57.250
N810 G03 X-19.250 Y-49.750 I0.000 J7.500
N820 G03 X-26.750 Y-42.250 I-7.500 J0.000
N830 G03 X-34.250 Y-49.750 I0.000 J-7.500
N840 G03 X-26.750 Y-57.250 I7.500 J0.000
N850 G00 Z3.000
N860 G00 Y-50.050
N870 G01 Z-9.500 F1200.0
N880 G03 X-26.450 Y-49.750 I0.000 J0.300 F3600.0
N890 G03 X-26.750 Y-49.450 I-0.300 J0.000
N900 G03 X-27.050 Y-49.750 I0.000 J-0.300
N910 G03 X-26.750 Y-50.050 I0.300 J0.000
N920 G01 Y-52.450
N930 G03 X-24.050 Y-49.750 I0.000 J2.700
N940 G03 X-26.750 Y-47.050 I-2.700 J0.000
N950 G03 X-29.450 Y-49.750 I0.000 J-2.700
N960 G03 X-26.750 Y-52.450 I2.700 J0.000
N970 G01 Y-54.850
N980 G03 X-21.650 Y-49.750 I0.000 J5.100
N990

N20 G91 G28 X0.000 Y0.000 Z3.001

G91 tells the machine to move in reference mode
G28 tells it to return to reference point ...

read more there:
http://www.cnccookbook.com/CCCNCGCodeG28ReturntoReference.htm
read that also
http://www.cnccookbook.com/CCCNCGCodeG00G01.htm


this exactly is the code that tells your machine to start from work 0
N90 X0.000 Y0.000 F3600.0



if you dont understand from first read whats happening, then dont mess around, just change the HOME position of your machine to left nearest corner instead of middle of the machine.

or you could just raise the jog rate to the max by the motor tuning /velocity/ so all free non cut positioning movements will happen a lot faster.

Quote:

---

N90 X0.000 Y0.000 F3600.0
N100 G00 X-27.650 Y-78.650 Z3.000
N110 G01 Z-3.000 F1200.0

---

line N90 is telling it to go back to the machine Zero with a feed rate of 3600 you can just take out the X0 and the Y0 or change the numbers to some where near your work piece is.
line N100 is taking you at rapid speed to the start of your job and line N110 is dropping your Z down to -3mm at the feed rate of 1200. ..Clive

Ahh I get it now thanks for that.. so if I set my machine home to front-left corner and position my work piece to as near to that as possible , and set the origin to bottom left in aspire, as well. It will or should start near enough at the work piece origin ?

Quote:

---

Originally Posted by Clive S

line N90 is telling it to go back to the machine Zero with a feed rate of 3600 you can just take out the X0 and the Y0 or change the numbers to some where near your work piece is.
line N100 is taking you at rapid speed to the start of your job and line N110 is dropping your Z down to -3mm at the feed rate of 1200. ..Clive

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Ah ! so if i take out x0 and y0 it will basically just start the work where I set the work piece origin ?
Can I take the entire line out .. -> N90 X0.000 Y0.000 F3600.0 or does it need the feed rate command to function ?

I would just take out the x and y zero

Quote:

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Originally Posted by Clive S

I would just take out the x and y zero

---

Thanks Clive I will try it tomorrow post results.

In Aspire or V Carve Pro, you can specify the "home" location, so it goes somewhere else other than 0,0.
You can also edit the post processor to remove that first move.

Quote:

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Originally Posted by Ger21

In Aspire or V Carve Pro, you can specify the "home" location, so it goes somewhere else other than 0,0.
You can also edit the post processor to remove that first move.

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Hi Ger21 I've managed to reset the machine home to near to the work piece so its working OK now, thanks for the advice