Hi,
V5
not sure best method to move to right the blue to have small circles tangent to the magenta one ?
step by step or vid or ?
MOVE TO BE TANGENT HOW.3dm (42.1 KB)
Cheers
Steve
Offset the magenta circle by the radius of a blue circle, then move the blue circle centre until it lies on the offset.
3 Likes
Cheers Jeremy,
I see the logic in that.
done that. looks good.
However when I trim the small circle with the larfe one and the lines, and join all lines it fails, zoom in and the large circle hasnt ended where the small one starts. there is an overlap.
why ?
Steve
Nothing needs trimming here…
MOVE TO BE TANGENT HOW_SL.3dm (88.3 KB)
01 target arc
_arc _tangent → click the 2 blue arcs, _radius 1.7
you can also measure the radius inline which will be twice “_radius”
first _radius for the option
second _radius fort the probe of the pink circle
_arc _tangent _pause _pause _radius _radius
02 move
_move with _CenterSnap _CenterSnap
01B construct it
this is the compas and ruler method.
copy the pink circle from _quadSnap to _quadSnap (black line/arrow)
_circe _centerSnap _centerSnap (the green circle)
_mirror
_move from _IntersectionSnap to 0 / or _centerSnap
This is because _Trim is inaccurate. If instead you use _Split you will find the various pieces end correctly and join.
The intersection point between two circles should lie on a line between their centres. If you draw that line and compare the trimmed ends you can see how far out they are. If you compare the _Split ends you will see that they are in the right place. The implication is that _Trim uses a different algorithm to _Split. That seems like a bad idea…
Note that, disappointingly, this _Trim bug still exists in Rhino 8.
2 Likes