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Messages - ian3846

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G-Code, CAD, and CAM discussions / Re: G3 G13 code verfication
« on: February 21, 2009, 07:34:34 AM »
ok that makes sense because that's the result I'm getting. so is there any way to spiral cut a circular pocket starting at say xo yo with a radius of 50mm?

edit: that is simpler then programing it manually maybe a macro? i haven't had the pleasure of using mach yet my personal cnc is still be constructed but has been put on hold due to the Australian $ taking a dive. so i don't know if it will or how it will react to macro......  but even so i still work with cnc's all day and it would be handy.

G-Code, CAD, and CAM discussions / Re: reset home with G code
« on: February 21, 2009, 06:03:29 AM »
would it not be g 91 g 28 zo xo yo ?

G-Code, CAD, and CAM discussions / G3 G13 code verfication
« on: February 21, 2009, 05:50:28 AM »

Hi Guys

Just wondering if any one can help with this using fanuc controlls.

G3 being circular interpolation
G3 can also be used to machine a helix be adding a "P" value

But from what i understood G13 is ment to be a flat helix or spiral if you like for example you could pocket out a circle cutting in ever grater spiral untill you reached the diamiter of the circle.

but when i try to run G13 all i can get is a single cirle of a given diameter with a lead in lead out.


would it be possible to use something like this

G3 x... y.... I..... j.... P.... F.....

If im thinking about this correctly changing G17 ( X / Y plane selection )
To G18 may make it spirl in an outward motion insted of a down motion?

          Please note, although no boardcode and smiley buttons are shown, they are still useable 

G-Code, CAD, and CAM discussions / Re: editing Gcode
« on: May 22, 2008, 02:50:23 PM »
yes there is it is a lot easier to do on ver 9, then on x though. if you tell me which ver you running i may be able to tell you where to look.

G-Code, CAD, and CAM discussions / editing Gcode
« on: May 22, 2008, 04:46:20 AM »
Just wondering if any knows if i can edit the g code on mach to suit master cam output. I know it can be done on master cam but thought it may be easier doing it here.

For example master cam outputs g3 as circular interpolation and mach has is it as helical interpolation.

Thanks guys

yes your right Sam sorry wheels my mistake.

the radius can be no smaller then then the arc if that makes sence but it could be larger
the problem with your code here is your not feeding anywhere your machine position is Y-2.75 X 3.5 and then your telling the machine to make a curve from this positon to this position.

if your trying to engrave letters using a cam program would be youre best bet. If you trying to mill out a circular pocket you could try this

G3 X0 Y25 R50 (this would give you a circular curve from X0 to Y25 with a radius of 50mm moving in a unti clockwise motion.) this would be 3/4 arc


G2 I50 J0 R50 this would give you a full circle starting from X50 Y0 with a radius of 50mm ( you need to work in incremental mode for this to work thats why its I + J instead of x+y

G-Code, CAD, and CAM discussions / Re: Help with G-code
« on: April 09, 2008, 07:41:51 AM »
just a thought but you may be able to use g54 - G59 just set the datum for g55 at the same place g 54 left off this would give you 5 cornices before you have to repeat the program.

Graham would this work?

As yet i havnt used mach3 but i will be shortly when i finish my mill. Basicly all operating systems use the same codes with a few differance which im not going to go into here.

m4 = unticlockwise rotation
m3= clockwise rotation 
m5= spindle stop

S = speed, 8000 would only normally be used in highy speed machining using carbide and coolant unless you have a small diamater tool

evrything i do is in mm ( im in Australia) but they still use imperial measurements in some parts of the world so youll find nearly all programs can be setup to use metric or imperial just depends what you prefer. so depending on which way you system is setup will depend on what 5 means. i ment it to be 5mm above the job.

In this line "G01 Z-0.25 F10 (THIS LINE IS GOOD)" G01 = feed Z-0.25 = .25mm below the surface of the work piece F = feed rate

so you teeling the machine to feed the tool .25mm below the suface of the job at a rate of 10

your tool speed can be worked out like this: say your using a 10mm drill made from high speed steel the calculation would be 300x25/10 ( 300 is rounded from pie 3.14, 25 is the allowable suface speed of high speed steel 10 is the diamater of the tool.

the same caculation is used for carbide except the suface speed for carbide is 120 your feed rate is normally one tenth your speed but this can vary considerably depending on your materail being used ( what your work piece is made out of) age of tool etc etc.

with out seeing a picture of what you trying to make its very hard to tell if the program itself is correct

glad to help, going though this stuff keeps it fresh in my mind so if you need anything else just yell out.

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