FILLET
Rounds the corner between two elements with an arc, or puts in an arc that starts on one element, touches a second and ends on a third.
Syntax
FILLET @a,@b,radius
FILLET @a,@b,radius,pointsOnly,trim,extend
FILLET @a,@b,@c,sideA,sideB,sideC,which
FILLET @a,@b,@c,sideA,sideB,sideC,which,trim
| Argument | Meaning |
|---|---|
| @a, @b | The two elements. |
| radius | The arc's radius. An expression. |
| pointsOnly | TRUE to only add the corner's points, leaving out the arc (optional: FALSE). |
| trim | FALSE to add the arc but leave the two elements as they are (optional: TRUE, trim them to it). |
| extend | FALSE to refuse elements that don't reach the corner (optional: TRUE, extend lines and arcs to it). |
| @a, @b, @c | Three elements (lines, arcs or circles): the arc starts on @a, touches @b and ends on @c, its radius whatever makes it touch all three. |
| sideA, sideB, sideC, which | Which arc: the side of each element its centre is, and which of those on those sides, as for the FILLET expression. |
| trim | With three elements, FALSE to add the arc but leave the elements as they are (optional: TRUE: @a and @c cut back to the arc, @b taken out). |
Examples
LINE @1,P0,P1
LINE @2,P1,P2
FILLET @1,@2,25
FIL1=40

The corner at P1 is rounded with a 25 radius arc; changing FIL1 makes it 40.
Notes
Between two line segments that meet at a point, the new points are worked out from the lines and the size is a new variable (FIL1, FIL2 …): change it in the Variables panel, or move the lines, and the corner follows. Between other elements, the elements are kept on the Construction layer and the trimmed parts are defined on them.
See also: CHAMFER, FILLET(), Fillet Tool.