I believe that R arcs that are 90 degrees or less are going to come out
very close to the IJK versions, but if you want a full circle, it's
better to break it up into 4 90 degree arcs. I don't know just where
radius arcs start to diverge from IJK arcs, but I would guess that 180
and 360 degrees are problem spots.
On 2/10/22 16:30, Les Newell wrote:
That code is testing the 180 degree issue, which is not usually a
major problem as far as accuracy is concerned. Try using a R value of
5.002, instead of 5.0025. In this case the arc does not technically
fit. Some controllers throw a fit and some quietly fudge the radius to
fit. I think LCNC fudges the radius, adding a tiny amount of error but
it won't be enough to measure.
Try using an R arc that's really close to a circle. Tiny rounding
errors in the X,Y coordinates can move the arc all over the place.
Les
On 10/02/2022 00:17, andy pugh wrote:
Thde docs state that a 7% difference was seen, but with some brief
experimentation I can't see it:
F1000
G0 X0 Y0
G2 X10 Y0.1 R5.00025
G0 X0 Y0
G2 X10 Y0.1 I5.0 J0.05
M2
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