Ramping G code

Being an old school G code programer I've never embraced CAD/CAM but wouldn't be without the conversational programing my control offers. I now need to machine an upstanding arc, with its centre at Z-36.5 the arc starts at X10.3 and finishes at X-10.3 (there is no Y motion involved) Having had a look at the manual G18 would appear to be prefix before G02/3 with the arc values signed by I & K. I've tried different combinations on the graphics but nothing runs. Can anybody supply a template for a ramping arc, (that runs) where I can fill in the values.

Thanks

Unless I'm missing something I'm having trouble seeing how you would machine an arc that steep ?

I not making myself clear. the arc centre is at Z-36.5 the arc itself would start some where around the Z-3/4 mark at X10.3 then a gentle sweep to X0 then on to X-10.3

Maybe this might help

OK got it, my bad, sorry.

Only way I can help is to show you a bit of code that I did back in June 2006 according to the code.

This was similar to the rocking boat type toolholders but was massive, about 100mm square and 224m long, again according to the code.

I'm presuming the K862.76 was the radius as it was only a shallow curve and from memory this was opposite to yours. i.e. concave instead of convex.

Hope this helps.

;( Produced :- 20:16:07 Tuesday, June 06, 2006 )
;( Post Processor :- M_AHHA )
;( Part Number ID :- )
;( Tools Used )
;( T16 20.0 End Mill)
N 20 G00 G21 G17 G90 G40 G49
N 60 M06 T19
N 80 G44 Z30.
N 90 M03
N 100 S3600
N 110 G04 P1.0
N 120 M08
N 135 G92 X-102.0 Y36.5 Z38.0
N 136 G00 X-112.0 Y0.0
N 140 G49 Z9.
N 150 G01 Z0.90 F260.0 ;
N 160 G18
N 170 G02 X112.0 I112.0 K862.76 F1200.
N 180 G01 Y-11.4
N 190 G03 X-112.0 I-112.0 K862.76
N 200 G01 Y-22.8
N 210 G02 X112.0 I112.0 K862.76
N 220 G01 Y-34.2
N 230 G03 X-112.0 I-112.0 K862.76
N 240 G01 Y-45.6
N 250 G02 X112.0 I112.0 K862.76
N 260 G01 Y-57.0
N 270 G03 X-112.0 I-112.0 K862.76
N 280 G00 Z30.
N 290 G54
N 300 G28 Z0.0
N 310 M30
%

Edited By John Stevenson on 13/01/2014 19:46:31

Thanks John, I'll try altering the values and see how I get on.

Hi. John.

Took out the G44 & G49 and it seems to work on the graphic screen, I'll try a dry run on the machine when I reach a suitable stage in a couple of days, its a starting point anyway. Thanks.

OK the G44 is specific to my machine . It's the tool length offset which on most is G43. G49 just cancels this.

New Post moved to it's own thread.

It's sure gonna be lonesome on it's own, as the new thread is closed. Looks like the anti-CNC brigade have taken over the asylum.

Andrew