CATIA 솔리드 모델링 1st 페이지 예제 - 01 (Multi-Body & Master Sketch 작업 방식)_01

Overview (what the video covers)

• A CATIA Solid (Part Design) modeling tutorial showing how to build an example part using a Multi-Body and a Master Sketch workflow.
• The instructor starts from a downloaded “start file” from a CATIA example page, then recreates the geometry using:
  • Pad (extrude)
  • Draft
  • Pocket (cut)

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Key tutorial steps / technological concepts

1) Reference drawing notes and design rules

• The drawing includes a “Normal Draft Angle” with an angle noted as 900 / 5 degrees (as transcribed).
• It uses a neutral plane referencing the XY plane (neutral plane described as “9 times that”).
• Unspecified fillet radii on the drawing are treated as 1.
• The geometry is intended to be symmetric, with the whole image mirrored using the XY plane.

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2) Start file + Master Sketch workflow

• CATIA opens the downloaded start file (in a space/screen context with no workspace set initially).
• The tutorial emphasizes:
  • Use the YouTube channel’s sketch-practice video/materials for the master sketch.
  • In this video, the instructor downloads the start file, then uses the existing master sketch to begin solid modeling in Part Design Workbench.

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3) Main body creation with Pad (O2 profile definition)

• Creates a body named “Main Body.”
• Uses Pad for the first solid feature:
  • Uses O2 Profile Definition to select the outermost loop/profile from the master sketch.
  • Uses a variable for thickness, set to 5 mm (variable name transcribed as “Main Technis/Main Technique”).
• Notes on controlling which sketch edges are picked:
  • Right-click → Go To Profile Definition
  • Switching behavior where Hole Geometry becomes Sub-Element and selecting parts of the outer line defines the profile.

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4) Draft feature setup (direction + preview checking)

• Applies a Draft feature (mold open/close slope control).
• Draft parameters required for activation:
  • Angle
  • Face to Draft (which side face gets the draft)
  • Inference element / plane (the plane where the draft starts)
• Critical workflow detail:
  • Use Preview first (instead of immediately pressing OK) to confirm the draft direction and alignment relative to the XY plane.
• Direction interpretation:
  • Discusses Z+ / Z- relative to XY and whether material is effectively cut vs. added depending on arrow direction.
  • The instructor flips the draft direction to match the mold/product opening/closing behavior.

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5) Fillet after drafting

• Applies a fillet (top face).
• The drawing context suggests a default R = 1 when no explicit radius is shown.

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6) Saving with correct folder structure

• Defines the output name as “PDG Page 1 Example 1”.
• Since the file is downloaded, uses Save As and stores it in a specific directory:
  • Folder name (transcribed): Part Design pdgr Page 1 Example 1

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Pocket creation via copy-paste + linked sketch behavior

7) Pocket setup by copying the main pad

• Creates a pocket leveraging the fact that the sketch already exists.
• Strategy:
  • Copy-paste the Main Body to create a new feature/body instance.
  • CATIA copying doesn’t always guarantee associative linking by default, but here the master sketch relationship is preserved because the copied pad still references the same sketch/profile selection.

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8) Renaming and organization

• Renames the copy:
  • From “Pocket” → “Pocket Body”
• Changes color to distinguish bodies and hides the Main Body.

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9) Pocket edit and depth/thickness control

• Double-click the pocket pad and go into Go To Profile Definition.
• Remove the old selected edges and re-select the pocket sketch at the 12 o’clock position.
• Uses variables for pocket depth:
  • Pocket height references the same thickness variable used earlier (Main Technique/Main Technis).
• Ensures correct positioning relative to the section:
  • Pocket positioning is 2 mm away from the bottom
  • Sets Second Limit to “minus 2mm instead of plus 2mm” so the subtraction/movement occurs in the correct direction relative to the draft/product space.

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10) Handling “Edge not found” after sketch edits

• After modifying the sketch, the draft/fillet related to the pad may fail and show:
  • “edge not found”
• Fix:
  • Re-remove/reselect the updated edges/faces/profile geometry in the affected features.

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Draft direction considerations for the pocket

• For pocket draft/inference element:
  • The draft should expand/grow along the Z-axis direction rather than be cut away.
• Because the “product” may effectively move opposite relative to mold movement:
  • The instructor re-selects the inference element from the bottom (not the XY plane)
  • Flips the draft arrow so preview indicates a material-adding behavior (light/dark blue surface visualization)
  • Confirms removal behavior is correct after applying.

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Fillet robustness across sketch changes

• The top edge fillet remains valid when the sketch changes because it was applied to a specific top surface selection (more stable than selecting a non-edge surface/corner edge).
• To reassign:
  • Double-click fillet and select another surface if needed (example shows selecting bottom surface).

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Main speakers / sources (as stated in subtitles)

• Source referenced: “Lee Chang-sik” (searched on Naver) and a CATIA homepage containing part design examples.
• Speaker: The instructor presenting the tutorial (name not explicitly stated in the subtitles).