# 2 Orthographic Projections from Isometric Drawing Given the isometric drawing, we are to **create front, side, and top views with dimensions**. Here’s how you can approach this in 2 steps, with illustrative examples: --- ## **Step 1: Analyze and Extract Key Dimensions** ### **Key Features:** - **Overall block:** 90 mm (L) × 30 mm (W) × 50 mm (H) - **Key holes and slots:** - 2 large holes (R20, Ø40) - 2 side holes (Ø16) - 3 tapped holes (M8 × 1.25) - **Outer slots:** 12 mm wide, spaced 30 mm apart **_Example:_** - The distance from the left end to the center of the large hole is 30 mm. - The height from the bottom to the center of the large hole is 25 mm. --- ## **Step 2: Draw the 2D Views** ### **A. Front View** - Shows the two large holes (R20) and their positions. - Shows the overall height and width. - Includes the slot cut between the holes. - **Dimensions to Add:** - Overall height: 50 mm - Distance between holes: 30 mm - Hole diameters: Ø40 mm - Slot width: 12 mm **_Example (ASCII representation):_** ``` ______________________________________ | | | O O | ← Holes (front) |______________________________________| ``` --- ### **B. Side View** - Shows the thickness (30 mm), location of tapped holes, and side holes. - Indicates the slot and the thickness of the arms. - **Dimensions to Add:** - Thickness: 30 mm - Tapped hole positions: 10 mm, 20 mm, 30 mm from top - Side hole: Ø16 mm **_Example:_** ``` ___________________ | | | o o o | ← Tapped holes | | | | | O | ← Side hole |___________________| ``` --- ### **C. Top View** - Shows the slot separation and width. - Shows the tapped hole positions and spacing. - **Dimensions to Add:** - Overall length: 90 mm - Slot width: 12 mm - Distance between slots: 30 mm **_Example:_** ``` ______________________________ | | | | | |___|________|________|________| ``` --- ## **Final Answer (What to Draw in AutoCAD):** 1. **Draw three 2D views:** - **Front view:** Show two large holes, slot, and overall height/width. - **Side view:** Show thickness, tapped holes, and side hole. - **Top view:** Show slot width, length, and tapped hole spacing. 2. **Add dimensions** as shown above in each view. 3. **Add a title box** containing: - Drawing title: "Orthographic Views of Mechanical Part" - Scale: 1:1 or as needed - Date, Drafter’s Name, etc. --- ### **Illustrative Reference** | View | Main Features to Include | |--------------|-----------------------------------------------------------------------| | Front View | 2 large holes, slot, arms, overall height/width | | Side View | Tapped holes, thickness, side hole | | Top View | Slot separation, slot width, overall length, tapped hole locations | --- **Use these steps to create accurate 2D orthographic projections in AutoCAD.** If you need an actual drawing or AutoCAD file, let me know!