G17,G18,or G19 on a Lathe???

[theemudracer]

I am wanting to know how to make a circle or arc on the O.D. of a tube with a live tool.

I am still learning the I and J thing on the Fanuc. I ran a Dynapath for 10 years and can prg. a circle in my sleep.

I have read the manual and confused on the whole G17-G19 thing. I think the G18 is modal. The wording is not that good in those fanuc manuals.LOL

thanks
Jon

[HuFlungDung]

Yes, G18 is the mode for the ZX plane.

The coordinate centers are I and K for X and Z respectively.

[dcoupar]

Jon,

Does your machine have the Cylindrical Interpolation (G07.1 or G107) option? If not, I believe you'll have to split the arc or circle into line segments and program Z/C line moves to approximate the arc.

Dave

[theemudracer]

Originally Posted by dcoupar Jon, Does your machine have the Cylindrical Interpolation (G07.1 or G107) option? If not, I believe you'll have to split the arc or circle into line segments and program Z/C line moves to approximate the arc. Dave

yes it does have the cylindrical interpolation option. The probem I am having is the code that is generated by my cam use I and J for coordinates. I can replace them with J and K if I can figure out how to do it that way. I can also breakdown all the circles and radius's into line segments but it increased the file size by over 8000 lines and I have to run it in the DNC option which is possible now but its cumbersome when you have to edit it.

I have read about the Cylindrical Interpolation function quite abit, but I wish they give better examples in the book. The way I understand it is you give the machine the O.D. of the tube, radius, and feedrate and endpoints.

Can you give me a better real world example of it and a programming format for such a cycle??

thanks alot
Jon

[CNCRim]

Originally Posted by theemudracer I am wanting to know how to make a circle or arc on the O.D. of a tube with a live tool.

Are you try to put arcs around the cylinder or use Y-axis to put contour on the OD?

[theemudracer]

All I have is X and Z and C. No Y axis.

Trying to engrave a circle or arc on the O.D. of a tube using Z and C axis.


thanks
Jon

[CNCRim]

O0000(ENGRAVE ON CYLINDER)
G20
G0T1000
M23
G0X6.Z-4.0258
C181.998
G97S2500
X5.05
G1G98G7.1C2.5(CYLINDER INTERPOLATION ON)
X4.875C181.9983F6.16
Z-3.5258C186.1727
Z-4.0258C190.3471
X5.875F500.
X6.
Z-3.7937C195.7083
X5.05
X4.875F6.16
C196.445
G3Z-3.9098C199.1051R.1161
Z-4.0258C196.445R.1161
G1C195.7083
G3Z-4.0127C194.478R.1161
Z-3.9098C193.0482R.1161
Z-3.7937C195.7083R.1161
Z-3.6598C192.6389R.1339
Z-3.5836C193.1844R.1339
Z-3.5258C195.7083R.1339
G1C196.445
G3Z-3.6598C199.5144R.1339
Z-3.7937C196.445R.1339
G1X5.875
X6.
G7.1C0.(CYLINDER INTERPOLATION OFF)
G0X5.875C258.689
M30

Hope it will help.

[theemudracer]

G1G98G7.1C2.5(CYLINDER INTERPOLATION ON)
X4.875C181.9983F6.16



Is the C2.5 the radius of the work piece??

and does it keep the 6.16 feedrate on the o.d of the work piece??


This helps alot
thanks
Jon

[theemudracer]

I tried the Clyinder interpolation with no luck
I get a "Illegal plane axis commanded" alarm as soon as it gets to the first
GO2 Line N52

Here is what I have for my prg.

N44G56
N45T0505
N46M43 (engage C-axis)
N47G0Z-3.6029C.6914
N48G97S4000M13
N49X2.55
G98
G7.1C1.25(CYLINDER INTERPOLATION ON)
N51X2.49F50.
N52G02Z-3.6644C.4117R.9259
N53G02Z-4.1431C.01R.6039
N54G02Z-4.4089C-.0075R.2024
N55G01Z-4.4854C.0025
N56G02Z-4.9313C.2827R.0788
N57G02Z-5.021C.4963R.7052
N58G00X2.55
N59Z-4.748C.5306
N60G01X2.49
N61G01Z-5.021C.4963
N62G00X2.55
N63Z-3.6029C.6914
N64G01X2.49
N65G01Z-3.6018C.8781

etc, etc......


thanks
Jon Thee

[jackson]

does it start to cut ?

[jackson]

can you post a pic of what you are doing

[theemudracer]

Originally Posted by jackson does it start to cut ?

No, It alarms out as soon as it hits the GO2 line.

Originally Posted by jackson can you post a pic of what you are doing

I have a .dxf file of what I am engraving but not a pic. I tried to upload the .dxf but the file size was too large.