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There are many ways to scale using CAD scale factors; here we have simplified some of them for everyone to learn from*, so that those who are just starting out with CAD can understand how to adjust the scale in the HaoChen drawing software. The method for modifying the scale factor in CAD is as follows: First, open a drawing file using HaoChen CAD, then use dimensioning to check whether the dimensions in it are 1:1. If it is found that the dimensions do not match the actual values, the blue-colored dimensions represent those subsequent annotations. Click Format in the menu bar above, select Annotation Style from the dropdown list, and the Annotation Style Manager will appear. Click on \"Modify\" on the right; here you can make appropriate changes to the contents of the drawing, such as changing units, tolerances, and conversion factors. It is the label for the default main unit; a scale factor can be seen in the middle. The original drawing was not in a 1:1 scale because 0.001 was entered as the scale factor. To make the drawing have a 1:1 scale, simply change this value to 1. Then click OK at the bottom, and you will return to the Annotation Style Manager dialog box. Click \"Set as current\" on the right side and then close the dialog box; this way, the ratio you just modified will take effect. When verifying the previous drawing again with marked dimensions, it can be seen that the dimensions on the drawing now match the actual dimensions. The above is a tutorial on how to modify the scale factor in the Haochen CAD drawing software. I hope it will be helpful for those who are just starting to learn CAD~