TANA Tangent Arc

TANL Tangent Line

General Format for TANA & TANL

Input Parameters

P90 = X1 center of arc 1

P91 = Y1 center of arc 1

P92 = R1 radius of arc 1

P93 = X2 center of arc 2

P94 = Y2 center of arc 2

P95 = R2 radius of arc 2

P96 = R3 radius of tangent arc (use in TANA only)

Calculated Output Parameters

P80 = Xs X starting point of tangent arc or line

P81 = Ys Y starting point of tangent arc or line

P82 = Xe X end point of tangent arc or line

P83 = Ye Y end point of tangent arc or line

P84 = Xt X center of tangent arc (TANA case only)

P85 = Yt Y center of tangent arc (TANA case only)

TANA C# or TANL C#

# is a number 0 through 7 in the tangent arc case, and 0 through 3 in the tangent line case.

This number selects one of the eight possible solutions of the TANA or one of the four solutions

of the TANL. The values of C# are defined as the tangent point being to the right or left of a line

connecting the centers of the arcs and center of the connecting arc, when facing in the direction

of tool movement. See the following diagrams for illustration of tangent solutions.

TANA Cases

1st 2nd Center

C0 = Right Right Left

C1 = Left Right Left

C2 = Right Left Left

C3 = Left Left Left

C4 = Left Left Right

C5 = Right Left Right

C6 = Left Right Right

C7 = Right Right Right

Sample Program Using TANA or TANL

N1 P90=0 (XC of arc 1)

N2 P91=0 (YC of arc 1)

N3 P92=1.5 (radius of arc 1)

N4 P93=5 (XC of arc 2)

N5 P94=4 (YC of arc 2)

N6 P95=2 (radius of arc 2)

N7 P96=5 (radius of tangent arc, not used for tangent line)

N8 TANA C3 or TANL C3 (calculate line or arc points)

N9 G2 R1.5 XC0 YC0 X[P80] Y[P81] (first arc #1)

N10 G3 R5 XC[P84] YC[P85] X[P82] Y[P83] (TANA calculated center and end points)

(or)

N10 G1 X[P82] Y[P83] (TANL calculated end point)

N11 G2 R2 XC5 YC4 X Y (second arc #2)