CATICS 3D02_01

Exercise 96 - 3D02_01

In this CAD tutorial we'll use the features: 

1. The "Positioning" Constraints

• Coincident: Forces two points (or a point and a line) to touch and stay connected. Think of it as Digital Glue.

  • Best for: Connecting the end of a line to the origin point.

• Midpoint: Locks a point to the exact middle of a line or arc.

  • Best for: Centering a rectangle on the origin without drawing diagonal construction lines.

• Concentric: Forces two circles or arcs to share the same center point (like a bullseye).

  • Best for: Making pipe walls or washers.

2. The "Orientation" Constraints

• Horizontal / Vertical: Forces a line to snap perfectly flat (Horizontal) or straight up (Vertical).

  • Best for: Straightening out sloppy lines.

• Parallel: Forces two lines to run side-by-side forever without touching (like train tracks).

  • Best for: Sketching a slot or a channel where the width must remain constant.

• Perpendicular: Forces two lines to meet at a perfect 90° angle (T-shape).

  • Best for: Ensuring corners are perfectly square.

3. The "Shape & Flow" Constraints

• Tangent: Forces a line to touch a circle/arc at exactly one point, creating a smooth transition.

  • Best for: Connecting a straight belt to a round pulley so it flows smoothly.

• Curvature (G2): A smoother version of Tangent. It matches the "rate of curve" rather than just the angle.

  • Best for: Car bodies and organic consumer products (Apple-style smoothness).

• Equal: Forces two lines to be the same length, or two circles to have the same size.

  • Best for: Making two screw holes identical. If you change the size of one later, the other updates automatically.

4. The "Alignment" Constraints

• Collinear: Forces two separate lines to sit on the same infinite path.

  • Best for: Making sure two mounting tabs are perfectly aligned on the same level.

• Symmetry: Forces two sides of a sketch to be perfect mirror images across a centerline.

  • Best for: Bottles, vases, or anything symmetrical. (Requires a construction line to act as the mirror).

5. The "Locking" Constraint

• Fix / Unfix: Locks a point or line in space so it cannot move at all. (Turns green).

  • Best for: Locking imported logos or reference geometry that you don't want to accidentally drag. Avoid using this for regular sketching—it's lazy modeling!

All dimensions are in mm/g/s/ISO  

#Fusion360 #Solidworks #Inventor #Autocad #FreeCAD

3D Sketch

 Sketch 96 - Catics 3D02_01

Exercise 96 - 3D practice drawing for all CAD software ( AutoCAD, SolidWorks, 3DS Max, Autodesk Inventor, Fusion 360, CATIA, Creo Parametric, SolidEdge etc.)

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Tutorial In Autodesk Fusion: https://youtu.be/yDDzLL1z3DQ