Ertan Toparlak-3rd Week Missing Terms

1-Geometrical Tolerances:A geometrical tolerance defines the size and shape of a zone within which a toleranced entity has to lie. It controls the form, attitude or location of a face. Geometrical dimensioning and tolerancing of a workpiece also impose important constraints on the selection and sequencing of operations although the ways geometric tolerances influence the selection and sequence of operations can be very complex.Special cases of line forms are straightness and roundness (circularity). Special cases of surfaces are flatness (planarity) and cylindricity.

(INTEGRATING ADVANCED COMPUTER-AIDED DESIGN, MANUFACTURING, AND NUMERICAL CONTROL:PRINCIPLES AND IMPLEMENTATIONS-1st Edition-Xun Xu-Chapter 7-P.133)

2-Parametric Design:Parametric design is a method of linking dimensions and variables to geometry in such a way that when the values change, the part changes as well – hence the dimension-driven capability. This implies that the CAD system treats all dimensions as variables that can be changed any time and almost anywhere, be it in the modelling mode or drawing mode. The geometry is of course governed by these dimensions in the parameter form.

(INTEGRATING ADVANCED COMPUTER-AIDED DESIGN, MANUFACTURING, AND NUMERICAL CONTROL:PRINCIPLES AND IMPLEMENTATIONS-1st Edition-Xun Xu-Chapter 1-P.19)

3-Positive Features:A positive feature is an entity or a group of entities that are added to the existing model.Apparently, the starting feature for a design model has to be a positive feature. A typical positive feature is protrusion. Protrusions may come in four forms depending on how they are constructed: extrude, revolve, sweep and blend.

(INTEGRATING ADVANCED COMPUTER-AIDED DESIGN, MANUFACTURING, AND NUMERICAL CONTROL:PRINCIPLES AND IMPLEMENTATIONS-1st Edition-Xun Xu-Chapter 7-P.150)

4-Negative Features:A negative feature is an entity or a group of entities that are removed or subtracted from the existing model. Therefore, they create depressions on a part. Cuts, slots and holes are some common types of negative features.

(INTEGRATING ADVANCED COMPUTER-AIDED DESIGN, MANUFACTURING, AND NUMERICAL CONTROL:PRINCIPLES AND IMPLEMENTATIONS-1st Edition-Xun Xu-Chapter 7-P.150)

Ertan TOPARLAK-503091329