Interpreting drawings and blueprints

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Before working from a solid model, most of the time you are

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given a drawing with information about sizes and tolerances for the part.

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It is important to look closely at this drawing to ensure that the information in it

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meets certain requirements that make machining the part possible.

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For this video, open the file Coupling Drawing.pdf.

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Zoom in on the view to the left.

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You can see that some of the dimensions have symmetric tolerances or deviation tolerances applied to them.

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Some of the tolerances in this drawing are specific, while others appear to be more open.

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For example, zoom in on the notes.

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The note reads, “Unless specified on the drawing,

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use the dimensions from the solid model with a tolerance of plus or minus three-thousandths of an inch” (±.003).

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Given the information in this note, before applying toolpaths,

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you would analyze all the dimensions and tolerances in this drawing

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to ensure that you machine critical areas using the right tools and the right strategies.

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Zoom in again on the left view.

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As you examine these dimensions, you must determine

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if your machine is capable of turning out a dimension like the one

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where you must hold it to a tolerance of two ten-thousandths of an inch (±.0002).

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These are all things that you want to keep in mind when interpreting a drawing before you apply toolpaths.