PLTW-Notebook day 13
Today we are learning about the dimension standards when sketching. We had to create our 3-D sketches then had to export them into the drawing tab. That is what we did for lesson 7.1. For Lesson 7.2 we did more dimensioning and 3-D modeling as well as 7.1.
You want it completely dimensioned so you are able to create the item without having to calculate.
Size dimensions will tell you the hight, width, and the length but location dimensions show you the dimensions from different perspectives.
Chain dimensioning is done linked and longer than datum dimensioning which usuallly is just a better perspective of seeing diameters and radius with datum dmensioning
Dimension drawing gives you more of a representation of a shapes diameter, length, and maybe width. While a written description is longer and must be read more carefully than the dimensioned drawing.
Arrows on a cutting plane indicate where you are able to split the item in half to put a plane or maybe to even mirror an object.
A full section is able to have a full section view of the object. Half section you are only able to view half of the section view of an object.
Yes hidden lines must be shown if their are cuts or extrusions in the object.
7.1
1. Why
is it important to have your drawing dimensioned completely?
2.
What is the difference between size dimensions
and location dimensions?
3.
What is the difference between chain
dimensioning and datum dimensioning? Which method generally results in smaller
dimensional deviation in manufactured parts?
4.
What are the similarities and differences
between communicating about an object or product part through a dimensioned
drawing and through a written description?
7.2
1. What
do the arrows on a cutting plane line indicate?
2. What
is the difference between a half and a full section?
3. Are
hidden lines shown in a section view?
4. What
conventions are associated with section lines?
Section lining is always bound by visible lines that are associated with section lines.
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