Re: Help needed with G code

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Mike Chaney"
<michaelchaney@b...> wrote:

> Greetings....
>
> I'm returning to this list after a couple of years absence, having

successfully

> converted my Taiwanese mill/drill to CNC in the meantime. Being

so inclined,

> I've been coding manually and producing parts in metal that I

certainly could

> not make by turning the handles.
>
> Today I ran into a problem, though, and I wonder if someone can

help or at least

> point me to someone who can. I've had a good trawl of the web and

this is one

> aspect where all the writers avoid going into any detail.
>
> I needed to cut a curve in the Y-Z plane and, although the G17,

G18 and G19

> codes are supported by CNCPRO (which I would heartily recommend,

by the way) I

> cannot work out how to use the I, J and K parameters to get the

right result.

>
> The following code should have cut a symmetrical convex curve from

Y6.20, Z-1.20

> to Y-6.20, Z-1.20 with its centre at Y0, Z-15.60. (The value of X

is not

> relevant.) By my reckoning, the cut should be anticlockwise

viewed from the X

> +ve end of the machine table.
>
> G00 Y6.20
> G01 Z-1.20
> G19
> G03 Y-6.20 Z-1.20 I-6.20 J-14.32
> G17
>
> It doesn't work, or rather the tool goes all over the place, so

what am I doing

> wrong?
>
> Thanks in advance,
>
> Mike

You might try it by changing the I,J to J,K.