Drafting Question: What are auxiliary and sectional views?

[Bipolarity]

What are auxiliary and sectional views when making orthographic projections? I missed class today, so I would like if someone could explain their significance in drafting.

P.S. I am drafting by hand, so no references to auto-CAD or SolidWorks please.

BiP

 

[Danger]

I did an awful lot of draughting by hand (even built my own table with a really nice machine and all of the fun tools), but I studied it only in grade 9 and 10. (It wasn't available in higher grades at my school.)
The way that I remember it is that auxiliary views are simply alternates to the normal ones, such as close-ups of exploded components. Sectionals are cut-aways, as if part of the object has been removed to reveal something behind it without the confusion of using hidden lines.
I'm not 100% sure about that, but it's the way that I was taught.

 

[DaveC426913]

Like Danger, without any formal training since high school, I would have said the same thing as he.

 

[NUCENG]

I did an awful lot of draughting by hand (even built my own table with a really nice machine and all of the fun tools), but I studied it only in grade 9 and 10. (It wasn't available in higher grades at my school.)
The way that I remember it is that auxiliary views are simply alternates to the normal ones, such as close-ups of exploded components. Sectionals are cut-aways, as if part of the object has been removed to reveal something behind it without the confusion of using hidden lines.
I'm not 100% sure about that, but it's the way that I was taught.

Auxiliary views are projections onto a plane that is not one of the three orthogonal planes. They are (Or were) used to provide dimensional information that was difficult to extract from the normal top, side, and front views or isometric drawings. With today's 3D drafting tools they are probably only useful in training to develop visualization skills for manual drafting.

Sectional drawings are as you described.

Exploded View drawings (my favorite when I was a draftsman in the dark ages BC - before computers) were considered an assembly drawing in our terminology.

 

[Danger]

Thanks for the info, NUCENG.
I can't afford any kind of draughting software, so I do my stuff in Inkscape (or Illustrator if I fire up one the the G3's). Auxiliaries are still quite handy to me.
Now that you've mentioned it, I remember the term "assembly drawing". I'd forgotten in the 40 years since school.