Week 10 - Challenge 1- Attachment Feature Creation (Ribs & Screw Boss)

Aim:- Attachment Feature Creation (Ribs & Screw Boss)

objective:-Create the rib for the Drill Handle considering the design rules mentioned in the video. 

Create the Screw boss for the Drill Handle considering the design rules mentioned in the video. 

General Guidelines for Bosses:

•   Draft  - 0.5 degrees on the walls of boss
•   Thickness -  Typically 40%* of the nominal wall at the base.
•   Height to Diameter Ratio -  3:1
•   Radii - 0.25mm maximum radii.  

. CREATING TOOLING AXIS :-

The Tooling Direction is basically the direction that the mold pulls a part.

The mold is built in two separate pieces, basically. You have a Cavity side and you have the Core side.

The Core pulls apart from the Cavity and that's the Dye line or the Tooling Direction.

• heck for gaps between surfaces for that click on join and then preview.
• If theres any gap between the surfaces join them with a maximum tolerance of 0.003 mm.

. xtract the boundary and dissemble the boundary.

. Find the correct tooling axis where the material don't interfere with the tooling axis and all the elements can be createIntersect the yz plane with respect to the class A surface.

Hide the class A surface and create point to point lines on the suspected drafts.

Create bisecting line with the two lines and point to create a tooling axis.

3. DRAFT ANALYSIS

The Draft Analysis command enables you to detect if the part you drafted will be easily removed. This type of analysis is performed based on color

ranges identifying zones on the analyzed element where the deviation from the draft direction at any point, corresponds to specified values.

Before going to drat analysis go to customized view parameter >under mesh >check material and then click ok.

Now for draft analyses go to insert » analysis » feature draft analysis.

Use the compasss to define the draft direction.

In the colour scale change the draft angle to 3 degree.

The component changes to green in indication of passing draft angle.

Use a running point to check the angle on the component.

. CREATING CLASS B SURFACE

Extract the surfaces from the class A using multiple extract and untrim them.

Use Extrapolate to make sure that all the untrims are properly intersected to trim and offset the surfaces to 2.5 mm to create the thickness.

Trim the extra surfaces using trim command.

Insert them into new geometrical set and name it with respective part names.

Apply fillets to the model after creating the entire surface.

If the edges are outside the fillet value will be added to the thickness of the component and if the edges are inside, the fillet value will be subtracted from the thickness of the component, for instance, the thickness of the component Is 2.5mm the fillet value is 15mm so the outside portion value should be 17.5mm and inner eges should be filleted 12.5mm to get uniform thickness.

Perform trims one at a time so that it will be clear to understand.

. CREATING CLASS C SURFACE

Extract the boundary from the class A surface using boundary command.

Using disassemble tool to divide the boundary as the boundary contains domains.

Use sweep command > choose profile type line > subtype as with draft direction > choose guide curve and draft direction > draft angle as 3 degree > preview.

• After getting sweep then trim the output with class B surface to get final output.

• Now open part design workbench and using close body surface create a solid of the component.

Sketch Used For Screw Boss Creation