Week 10 - Challenge 1- Attachment Feature Creation (Ribs & Screw Boss)
DRAFT ANALYSIS REPORT OF DOOR HANDLE
Introduction:
Draft Analysis is the process of analysing the designed plastic part if it has the drafting angles as per the requirement. In CATIA, draft analysis is done by the tool called Feature Draft Analysis. It shows the different draft angles available at different parts and says if it meets the requirement or not by various colour codes. In this example, a Door handle class-A surface is taken for the draft analysis study.
Objective:
To perform draft analysis for both Class A surface & finished part of the Door handle.
Steps need to do before draft analysis:
1. Creating the tooling axis:
The given part (class A) is first checked for its boundary to find if there are any gaps or openings or discontinuity in the boundary. If there is any boundary you need to close the boundary before go to further.
After completing the boundary check insert a point at almost the symmetric centre of the part and insert a coordinate system at the point. The coordinate system should be facing in all directions the same as the default coordinate system.
Before actually creating the tooling axis, we need to create two dummy tooling axis on the class A surface at a point we created earlier. Then by using bisecting line command we need to find the final tooling axis.
First do creating dummy axis on the XY plane, by taken reference from the class a surface. With that reference lines by using bisecting line command, we can create dummy tooling axis for the XY plane. The below images show the dummy tooling axis for XY plane.
Then create a dummy tooling axis on the ZY plane by taking reference from the class A surface. Since there is only one intersection line, a dummy tooling axis is drawn at 3 degrees from the reference line at the point we created earlier. The below images show the dummy tooling axis for the ZY plane.
Now, using the two dummy tooling axes, use the bisecting line command to create a new line (TOOLING AXIS) and select the result in the required direction. This will give the tooling axis we require. It can be made bold and the colour can be changed for better visibility.
2. Perform draft analysis
Now, perform the draft analysis of the door handle. To do so, go to Tools > Analysis > Feature Draft Analysis. This tool has three groups of options, namely mode, display, and direction. First, the second icon from the direction group is selected, and the red dot in the compass is clicked and dragged to the part to be drafted. The line in the dragged element is matched with the tooling axis, and it is locked using the first icon in the direction group. It will define the tooling axis direction and lock it. Then click the door handle. It will create different colors on the main part. If the part is in green color, it shows the draft angle is ok. If it is not in the sense, then do correct the sketch of the tooling axis to correct it. The final result shows that all areas in the door handle maintain a thickness of 2.5 mm and a 0.5 to 3 degree draft angle.
Screenshots of the draft analysis report for the given Class-A surface
Screenshots of the draft analysis report for the given door handle (with Rib’s & boss’s)
Screenshots of the solid model with the proper colour code of the draft angle in various orientations with tree structure (Isometric, Front, Side, and Top View)
