ADDA DRAFTING CERTIFICATION: COMPETENCY 9
(REVOLUTIONS)
revolution - Answer -rotation of an object to show true length at an angle in one view
(foreshortens rest); used to eliminate need for auxiliary view; view that is revolved is
always the one where the axis is shown as a point and the view is not changed in shape
and size; in views where the axis shows a line, the dimension parallel to the axis
remains unchanged
viewing plane - Answer -plane from which an object is viewed (front, top, right-side,
etc.)
primary revolution - Answer -revolution that occurs at another angle after the initial
revolution
successive revolutions - Answer -view projected from a primary revolution or another
revolutions
plane - Answer -three non-linear points in space, two non-parallel intersecting vectors,
two parallel vectors, or a line and a point non on line
true size - Answer -surface that is shown in its actual size; plane is parallel to the plane
of projection
path of revolution - Answer -
true length line - Answer -ALWAYS parallel to the reference plane in ALL adjacent
views; actual size of line; to find, draw view of line where reference plane is parallel to
an adjacent view of the line
true angle - Answer -angle formed by two intersecting planes shown in its actual
measure
dihedral angle - Answer -angle between two intersecting planes
rectified length - Answer -(Determining the length of an irregular arc segment?)
helix - Answer -curve created by line winding around a shaft; curving path that a point
would follow if it were to travel in an even spiral around a cylinder and parallel to the
axis of that cylinder
revolved view - Answer -view created from revolution of an object
(REVOLUTIONS)
revolution - Answer -rotation of an object to show true length at an angle in one view
(foreshortens rest); used to eliminate need for auxiliary view; view that is revolved is
always the one where the axis is shown as a point and the view is not changed in shape
and size; in views where the axis shows a line, the dimension parallel to the axis
remains unchanged
viewing plane - Answer -plane from which an object is viewed (front, top, right-side,
etc.)
primary revolution - Answer -revolution that occurs at another angle after the initial
revolution
successive revolutions - Answer -view projected from a primary revolution or another
revolutions
plane - Answer -three non-linear points in space, two non-parallel intersecting vectors,
two parallel vectors, or a line and a point non on line
true size - Answer -surface that is shown in its actual size; plane is parallel to the plane
of projection
path of revolution - Answer -
true length line - Answer -ALWAYS parallel to the reference plane in ALL adjacent
views; actual size of line; to find, draw view of line where reference plane is parallel to
an adjacent view of the line
true angle - Answer -angle formed by two intersecting planes shown in its actual
measure
dihedral angle - Answer -angle between two intersecting planes
rectified length - Answer -(Determining the length of an irregular arc segment?)
helix - Answer -curve created by line winding around a shaft; curving path that a point
would follow if it were to travel in an even spiral around a cylinder and parallel to the
axis of that cylinder
revolved view - Answer -view created from revolution of an object
