How To Draw Inclined Faces and Circles

# How To Draw Inclined Faces and Circles - Pulling dimensions...

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Pulling dimensions off of hard to visualize isometric drawings Step One: Understand what measurements can and *cannot* be taken from isometric views. -Any line that is NOT perpendicular to a principal plane (and therefore not collinear with a coordinate axis) cannot be measured directly (see diagram below). In this figure, to get the correct length of the inclined face you would have to measure the height and length (collinearly with the Z and X axes respectively) from a similar point and then connect the two ends (as if drawing a triangle). How to draw the inclined face in the principle views:

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In each of the three following examples, all of the measurements or extending lines are done collinearly with an axis (either at 30 o , 90 o or 150 o from the horizontal where 0 o is in the positive X direction in the Cartesian coordinate system.)
From the previous two examples, you can see that you can extend “temporary” lines (as long as they are collinear with an axis) and these extensions will allow you to find the true dimensions of a line. This is especially helpful when part or all of an inclined surface is obstructed by another face as in the following example. If you are given an object like the one above where the inclined face has some/all of its “true length” sides (sides that

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How To Draw Inclined Faces and Circles - Pulling dimensions...

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