[工学]Chapter4ViewsandDimensionsofCompositeSolids.ppt

Chapter4 Views and Dimensions of Composite Solids 4.1 Analysis of Composite Solids 4.1.2 Relative positions of composite solids (2) When two neighboring surfaces are in tangent condition, there is no line between their projections. (3) When neighboring planes intersect, one should draw the projection of the intersection line. 2. Subtraction 4.1.3 Shape analysis method 4.2 Drawing views of Composite Solids Example 1. Draw the threeviews of the composite solid. 2. Selecting the front view 3. Select the scale and the size of drafting paper Example 2. Draw the threeviews of the composite solid. Example 3. Draw the threeviews of the composite solid. 4.3 Reading views of Composite Solids 2. Understanding the meaning individual lines and other drawing elements of the view 3. Reading start from a view that most reflects shape characteristics Character views of location 4. be good at thinking of object 4.3.2 Methods and steps of reading 2. Steps of reading (3) Understanding shape from the drawing elements Example 4. Given the threeviews of the object, imagine the space shape of the composite solid. Example 5. Given the threeviews of the object, imagine the space shape of the composite solid. Example 5. Given the threeviews of the object, imagine the space shape of the composite solid. Example 6. Given the front view and the top view , imagine the space shape of the composite solid. Example7. The front view and top view of the composite solid are known, add the missing leftside view. Example 8. The front view and left-side view of the composite solid are known, add the missing top view. Example 9. The front view and left-side view of the composite solid are known, add the missing top view. Example 10. Draw the missind lines shown in views. Example 11. The front view and top view of the compo-site solid are known, add the missing left-side view. Example 11. The front view and top view of the compo-site solid are known, add the missing left-side view. Example 12. T