Week 8 - Challenge 4 - Coin Holder Design

AIM : To make a model from the provided class A surface.

INTRODUCTION:

class-A surface : A surface made by the designer which is given as an input to tha plastic modeler to work on.It is aesthetic surface and the outer most 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.

METHODOLOGY:

In this model we have focused on the following things

1. Tooling axis
2. Draft analysis
3. Class-B surface
4. Class-C surface
5. Making a solid model from surface

Following tools were used to reach the final step:

1. Extract
2. Un-trim
3. Trim
4. Extrapolate
5. Offset
6. Edge fillet
7. Boundary
8. Sweep
9. Join
10. Close

FOR DRAFT ANALYSIS:

1. First we analysis the model and then choose dummy axis in x and y direction.
2. As we intersected to proceed we observed that the side walls are not given any draft.Hence we assume the axis normal to the base surface and parallel to side walls.this surely will create problems because a minimum draft has be provided.
3. As class-A surface is made by other designer only he is authorised to make changes,so we look over this to complete the coin holder for practice.
4. Now we go to insert<analysis<draft analysis and follow usual procedure to do the analysis.
5. Align the compass and click on the surface and as expected the model is mostly is mostly in red color i.e negative draft with respwct to the axis
6. To correct it to as best as we can we moved the compass a bit till we got most of the surfcaes in green and lock that position
7. After hitting ok,We change the direction of the line from z axis to compass direction.The axis will align itself accordingly.

Note: As the side wall doesnot have draft, this result was expected and few areas needcorrection.But still we are moving forward to complete the model.

FOR CLASS-B SURFACES

1. We have divided the entire model into base side walls,inside side walls and outer flange and worked on them one by one.
2. Everywhere we follow same procedure ie extract un-trim ,extrapolate,trim and offset
3. First base then side walls.To avoid confusion we trimmed both together and made them one.Also the fellet was given
4. Then we move to inside side flange Here insted of using extract and untrim we directly used multi-extract and extrapolated it
5. We nearly do the same procedure for outside flange.After all these we get a basic sharp model
6. we then make all of them one by trimming
7. After measuring various fillets,we fillet the surface.Remember to keep minimum fillet value as 1mm.

FOR CLASS-C SURFACES

1. In this model,Unlike the earlier models,we have used parallel tooling axis.Hence we cannot use with draft direction option under sweep
2. The C surface will mostly
3. Here we will first get the boundary of the class-A surface and sweep it with reference surface option
4. Similarly we will get thye C surface for the hole to close it.

FOR FINAL MODEL

1. Join class-A and class-C surface together
2. Then joining class-B surface to them
3. Go to the part6 design and close the feature
4. Run draft analysis on the model.

TREE STRUCTURE: