Week 10 - Challenge 2- Attachment Feature Creation (Dog House)

Respected Sir,

According to the given rules dog houses prepared well on door trim, for more information, please look into the below attachments.

Thanking you,

REPORT WRITING ON DRAFT ANALYSIS OF DOG HOUSE PLACED ON DOOR TRIM

Initially, the given surface model door trim is seen in 3 different directions such as x, y, and z axis, using compass. This is done to select appropriate axes which cover the entire surface of door trim. Thus, an appropriate axis is selected to create draft analysis. Before doing drafting analysis, the important thing is to create a dummy tooling axis to find the main tooling axis. In simpler surface models, we selected the flat surfaces or flat surfaces consisting holes in a rectangular planes to create the main tooling axis. As we know that, door trim is a type of complicated unique shape. Hence, entire surface model is selected directly to do the drafting analysis by creating the dummy tooling axis as the main tooling axis.

By using intersection command, an appropriate plane and class A surface is selected. Now the sketch is generated, through which draft lines has to be selected. Here it is observed that, there are no draft lines in the sketch, i.e., all the lines in the sketch were normals with zero degree inclination. With the help of line command and point generated on the flat surface, directly an actual tooling axis has drawn. Now, this tooling axis which is generated will help us to create a class C surface using sweep command in future or further processing.

Similarly, another image is represented above as Fig (b), which depicts the line drawn through the point created using the line command, by selecting point-direction option. This line drawn is nothing but, it acts as a dummy tooling axis. Due to complicated surface model, this dummy tooling axis is referred as main tooling axis and done draft analysis further.

The same tooling axis is used during creation of class C surface. During class C surface some of the sweep models were created by selecting the main tool axis direction. The sweep models made using tooling axis were shown below in the form of figures.

The above 2 figures, Fig (c, d) represents sweep models were tooling axes created for draft analysis is used to represent the direction and the draft angle is given here as 3 degrees.

It was also observed that the parting line of cavity should coincide with the parting surface, to obtain a good quality part model.

Thus, drafting analysis made on a closed surface after final trim of class- A & C with class B surface. During draft analysis, initially the compass have brought and coincided with main tooling axis. Now, once again the compass option have clicked and moved from the main tooling axis and once again coincided with the same axis. So that the created closed surface is turned into green colour by clicking the mouse pointer on the surface and selecting the inverse draft option. Now, here at 3 degrees, some portion of the closed surface is red, so the value from display which represents 3 degrees is changed to 1.45 degrees. 1.45 degrees is also well suitable for manufacturing the component for some uniquely defined shapes like dog houses.

Also separately for dog houses also draft analysis is made. First draft analysis done with respect to main tooling axis of door trim, for outside boundaries of dog house. Another draft analysis have done with respect to side core axis of dog house, for inner side boundaries of dog house. Thus according to the design parameters of dog house, it was observed that the draft angle of 1.45 degrees is well suitable and also the designed dog house met the required draft angle as shown in above figure.