Week 9 - Attachment Feature Creation (Ribs & Screw Boss) - Challenge 1

• Aim : Create the rib for the Drill Handle and Create the Screw boss for the Drill Handle.

• Report: I had exatract the surface from the Class A surface and then create a point on the surface and through that point create a line normal to surface.

Tooling Axis is red colour line.

Class A Surface : class A surface is given as input.

it has zero thickness.

Class B Surface: I had created the class b Surface from the class A surface by extracting the surface then untrimming and extrapolation and trimed with other surfaces. the thickness of the final solid part is 2.5mm bacause that i had offseted the class B Surface from class A surface by 2.5mm.

class b Surface is same as of class A surface but it offseted from class A . class B surface is alway behind the class A surface.

Class C Surface : when Drafting suface is parallel to tooling axis then we given draft angle of 0 to 3 degree, but when drafting surface or class C surface is perpendicular to the tooling axis then we take sweep angle as 90 degree.

Class C surface join the Class A surface and the Class B surface size of the class C is thickness of the part.

Final Closed Surface of the coin holder is created by joining the Class A surface and Class C surface and that joined body trim with the Class B surface and created the final closed body.

Solid part : I had created the solid body by using close surface command in part design from that closed body.

Draft Analysis :

Draft Analysis of Class A surface:

I had done the draft analysis of the class A surface with draft angle of 2.9 degree.

Their is problem in Class A Surface surface because their is red surface in class A surface drafting. class A surface is send back to class A Surface designer to rework on that model. angle of tooling axis with surface is 89 degree. it should 90 degree but 1 degree less angle that red portion show.

Draft Analysis of Solid Part:

I had done the draft analysis of the solid part with draft angle of 2.9 degree but their is red surface is due to zero degree draft angle it get eliminated when change draft angle to 2 degree and then part get easily ejected from the mould.

Publication:

Engineering Features:

Rib is create on B surface to give strength to the part and screw boss also created on B surface. height of the rib and screw boss is 12mm.

Isometric View:

Top View:

Front View:

Right View:

Left View: