What does counterbore/spotface and down arrow with a bar on top symbol actually means?

I was given an assignment with instructions that is worth a lot of our grade in my CAD class. We use AutoCAD 2015.

Asked on November 29, 2016 in AutoCAD.
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Hello,

 

Bore: is a cylindrical hole done with a top circular diameter.

 

Counter Bore: is  a top circular diameter with a shamfer or a bevel, You can think of it as a housing for a screw to sit in, so that there is no difference between the part and the screw’s head.

 

Hope this clarifies things 😀

Answered on November 29, 2016.
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