Week 8 - Challenge 3 - Coin Holder Design
AIM: Create the Coin Holder plastic Design through the given Class-A Surface.
INTRODUCTION:
CLASS-A SURFACE: a surface made by the designer which is given as an input to the plastic modeler to work on. It is an aesthetic surface and the outermost surface.
CLASS-B SURFACE: a surface below a certain thickness from the class-A surface is class-B surface. This is the surface that contains engineering aspects of a model.
CLASS-C SURFACE: a surface that joins class-A and class-B surfaces is class-C surface.
FOR DRAFT ANALYSIS:
First we analyse the model and then choose the dummy axis in x and y direction. As we intersected to proceed, we observed that the side walls are not given any draft. Hence, we assume the axis is normal to the base surface and parallel to side walls. This surely will create problems because a minimum draft has to be provided. As the class-A surface is made by another designer only he is authorized to make changes, so we look over this to complete the Coin Holder plastic Design for practice.
Now we go to draft analysis and follow the usual procedure to do the analysis.
Align the compass and click on the surface and as expected the model is mostly in red colour i.e. negative draft with respect to the axis.
To correct it as best as we can we moved the compass a bit till we got most of the surfaces in green and locked that position.
After hitting ok, we change the direction of the line from z axis to compass direction. The axis will align itself accordingly.
FOR CLASS-B SURFACES
We have divided the entire model into base, side walls, inside side walls and outer flange and worked on them one by one Everywhere we follow the same procedure i.e., extract, un-trim, extrapolate, trim and offset. First base, then side walls. To avoid confusion, we trimmed both together and made them one. Also, the fillet was given.
Fill the gaps to make the closed surface.
FOR CLASS-C SURFACES
In this model, unlike the earlier models, we have used a parallel tooling axis. Hence, we cannot use ‘with draft direction’ option under sweep. The C surfaces will mostly be created like shown below.
FOR FINAL MODEL
Join class-A and class-C surfaces together.
Then Trim class-B surface to them.
Go to the part design
and close the feature.
Run draft analysis on the model.
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