DESIGN
Slide 06
To make the crown adaptor, you must first design the part, in other words model it numerically according to the necessary constraints.
This modelling will be the unique base and it will serve for all the other steps.
In the photo on the left we can see the digital model made by CAD software, and on the right the manufactured part made with production means.
Let's now study the different steps necessary to obtain a digital model.
Slide 07
The first step in design is to decide on the initial volume of the part.
The initial volume is made by means of an extrusion of the base drawing[1]; the base drawing gives the outline[2], or profile[3] of our part.
The outline[2] is drawn, on a plane surface, known as two dimensions, or in 2D, and is then extruded.
Extrusion means the base drawing is prolonged along an axis perpendicular to the plane of the original drawing.
The depth of extrusion gives the thickness[4] of the part.
Slide 08
The initial volume can be cut to shape, so that it has the correct shape of the crown adaptor, making the necessary rounded edges[5] and cut-outs[6], so that the part can be made by casting.
Slide 09
Slide 10
The final actions required are the boring[10] of the central bore[11], used to centre the part, and the drilling[12] and countersinking[13] of the five holes to fix the crown adaptor to the hub.
Slide 11
After having designed the part, the final step is the technical layout drawing[14] and the functional dimensioning and fixing of tolerances.[15]
This step corresponds to the production of the reference document for the designed part. This reference document can be printed and it is the technical layout drawing of the part designed by the software.
This document indicates the dimensions, tolerances and geometric constraints[16] which are the technical characteristics of this part.
