To help you use CM GRAAL 3D, we propose that you carry out the machining paths of the 3D files that you have made in the CAD module.

In the CAD module, open the file of the plate that you have normally named: " Ex5.CAO "

For this first exercise, you will use the blank size automatic calculation function.

As you are going to make this recessed machining, it is advisable to limit the area to be machined to the outside contour of the plate, using the function " extract the edges ".

As this function will extract all the edges of the surface, it is advisable to delete those that are not on the outer edge. To do this, you will place them on a different plane taking care that no object is selected.

Click on " property " and in the tab " drawing ", choose " plane 2 ".

Select the surface of the plate.

Click on: " extract the edges " of the " tools " menu.

Then deactivate the " drawing " plane where the surface is and on the visible plane2, delete all the entities except the outer circle.

Then reactivate the " drawing " plane and check that after a global selection, there are only two objects (the surface and the outer contour).

Save then click on the icon " FAO3D ".

You can use the material you wish to carry out this machining. For this example, we will take Labellite foam.

Choose the material: " Labellite foam ".

Click on: " automatic reframing ".

Validate by: " OK ".

You will find your drawing in the CAM module integrated into the blank and in perspective.

Select the surface as well as the line contour using the " select all " function or the shortcut " space bar ".Click on " describe the machining " of the contextual menu.

In the first window click on : preform + finishing.

Choose in the following window the preform tool : N°17 end mill 2 flutes of 6, long.

Then the definition tool : N° 19 ball end mill of 6.

In the following window choose the automatic preform strategy and click on:

" next ".

In the following window, choose a manual finishing strategy and click on: «next ".

In the following window (manual finishing parameters), you will choose a strategy of concentric machining, with a crosswise restart in automatic mode. You will also give the actual surface a value of crest height and tolerance of 0.03 mm.

Then click on " next ".

The following window asks you to display or not the additional parameters. If this window does not appear, it is because it is deactivated; in this case, you must go into the " Preference " sub-menu of the " Display " menu then choose the tab " Advanced " then the button " Global ", and finally you must select the function " Show the dialogue box : advanced parameters ".

Click on " show the additional parameters " then on " next ".

In the following window, click on: " activate the area to be machined " and choose " interior " then click on " next " which will launch the calculation.

The following window gives you the machining values in Preform and in Finishing with the estimated machining times.

Click on finish to display the toolpaths.

Before tooling the plate by the usual method, you can visualise and print the machining report which recalls for you the strategies and values of machining used; it is also advisable to make a simulation.

Attention: when you launch the machining, the thickness of the blank that will be displayed in the driver will be the one calculated by the automatic reframing i.e. about: 25.56 mm ; you will have to enter instead of this value the actual thickness of the blank you are using.