TAILIEUCHUNG - Modelling with AutoCAD 2011 Part 10

Tham khảo tài liệu 'modelling with autocad 2011 part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Dimensioning in model and paper space 263 Viewport specific layer 1 With Format-Layer from the menu bar use the Layer Properties Manager dialogue box and a pick the DIM layer then New b alter the Layer1 new name to DIMTL c pick Current then OK 2 With the top right viewport current activate the Layer Properties Manager dialogue box and a pick the DIMTL line b pick freeze in current viewport c pick OK 3 Repeat step 2 in the lower left and lower right viewports then make the top left viewport current 4 Dimension the top horizontal line and the circle as before and these two dimensions will only be displayed in the top left viewport due to the viewport specific layer DIMTL. These two dimensions are designated by a in Fig. Paper space dimensioning 1 Enter paper space 2 Dimension the same two objects as before . the top horizontal line and the circle. Use the DIM layer. 3 These two dimensions are designated by b in Fig. and are obviously not correct 4 How then can paper space be used to give true dimensions Figure Adding dimensions in model and paper space. 264 Modelling with AutoCAD 2002 Using DIMLFAC DIMLFAC Dimension Linear scale Factor is a system variable which when set to the correct value will scale linear and radial measurements and allow paper space dimensioning of model space objects to have the correct value. 1 In model space make the top right viewport active then enter paper space 2 At the command line enter DIM R and prompt Dim enter DIMLFAC R prompt Enter new value for dimension variable or Viewport enter V R - the viewport option prompt Select viewport to set scale respond pick the border of the top right viewport prompt Dimlfac set to then Dim respond ESC to end the command line dimension sequence 3 Still in paper space dimension the same linear and circular objects in the top right viewport. The dimensions should now be correct designated by c Using DIMASSOC DIMASSOC is a system variable which controls dimension associativity

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