Thread Ruler Simulator Home

Perpendicular Protractor Construction (Patent 7,080,459).

Select Tool Mode

Slider Position ($2c$): 18.0 cm

Taught Thread Length ($L = 2a$): 24.0 cm

Compass Rotation Angle (θ): 45.0°

Parallel Line Length ($h$): 16.0 cm

Kinematics & Geometric Metrics

Focal Distance ($2c$)

Perpendicular Top ($F_1$) to Slider Top ($F_2$)

18.0 cm

Thread Length ($d_1 + d_2 = 2a$)

Constant sum to both foci

24.0 cm

Semi-Axes ($a, b$) & Eccentricity ($e$)

a = 12.0, b = 7.9 cm

e = 0.75

Display Options

Render Realistic Thread Ruler Hardware[cite: 2] Show Foci Markers & Thread Vectors[cite: 2] Keep Persistent Markings Trace

Protractor Edge Set Perpendicular (90°) to Ruler Beam[cite: 2]