The default measurement unit that comes with Catia v5 is in milimeters (mm) and the spacing for the grids are 1 mm for major grid lines (or also known as Primary Spacing) and 0.1 mm for minor grid lines (or Graduation).
However, as you may have noticed, the Catia v5 Tutorials that is available here uses inches (in) as their measurement unit. In order to adjust the measurement unit to the one that you desire, all you have to do is to access the Options window located under the Tools menu.
In the Options window, select Parameters and Measure which in located on the Options tree. In there, select the Units tab and you will be presented with all the parameters available in Catia v5. Select the parameter that you want to adjust and for this tutorial purpose, we will be changing the units for Length. Once you have selected a parameter, you can change its units by using the drop down menu.
In the Sketcher menu, under the Mechanical Design tree, you can adjust the Primary Spacing and the Graduation values to suit your preference. As mentioned earlier, Primary Spacing is basically the length of each major grid lines while Graduation is the spacing between minor grid lines.
As you can see below, I have set my Primary Spacing to 1-inch and the Graduation to 10. This basically means that the length of my major grid lines will be 1-inch while the minor grid lines are 0.1-inch.
I hope that you found something useful in this tutorial. Make sure to check back for future updates in Catia v5 Tutorial for Beginners.
