Re: G02 - G03

The posts about the accuracy of I,J start, and endpoints for Go2 and
G03 reminds me of a bunch of ellipses that I figured out these values for
using a Vic 20 a lot of years ago. I programmed them as a series of
circular arcs just like the Machinists Handbook suggests. I think that it
was 12 arcs to make the full ellipse and keep it in tolerance. There were
about 10 different sized ones getting smaller at the bottom like a
stadium. I used 4 digits after the decimal.

The program ran like a charm on a Mazak M-1 control but after a couple
years they upgraded to an M-2 control and the part wouldn't run any
more. We found out that that the new control needed 5 digits.

Ray

> Date: Mon, 21 Aug 2000 16:17:15 -0700
> From: "Darrell" <dgehlsen@...>
> Subject: Re: G02 - G03
>
> IJK is the most accurate. R is probably easier to under stand. Along with
> IJKs accuracy is the requirement for your numbers to be accurate. Most
> controls have a tolerance parameter that determines when the control errors
> out.
> Darrell