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Best Practices And Helpful Tips For Everything CAD Drawing

[1] 9 Easy Blueprint Tips and Tricks

What does a good blueprint provide for design and manufacture?

  • Reduces errors with interpretation and implementation.

  • Saves manufacturing money by specifying accurate tolerances and requirements.

  • Specifies critical dimensions and features for special attention and inspection.

  • Excellent communication beginning from concept and continuing through completion.

Useful with any CAD program: Solidworks, Autocad, Fusion3D, Catia, Inventor, Creo, and others.​

Create more professional drawings.

[2] Scribble Value

A concise whitepaper on the benefits of hand sketching in the early design process.

  • Quickly iterate through early ideas.

  • Easily explain your concepts to other people.

  • Have meaningful conversations about your ideas and avoid having to explain to people what your idea even is.

Greenpapers

[3] GD&T, Geometric Dimensioning and Tolerancing

Flatness

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Flatness determines the allowable overall surface variation between two parallel limiting planes.

 

The location of the limiting planes are set by the actual manufactured part's surface.

The spacing of the limiting planes is set by the flatness tolerance value.

An acceptable part must fall within both the flatness tolerance and the size tolerance.

Straightness

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Straightness determines the allowable overall variation of longitudinal elements in the indicated surface.

 

This is used often in mating parts such as a pin and a hole.

Straightness can allow both size and form variation when used with the MMC callout to permit the  median centerline tolerance to increase based on the actual part size at each location.

An acceptable part must fall within the stated tolerance.

Circularity

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Circularity determines the allowable variation of surface elements located in planes that are perpendicular to an axis.

Each perpendicular planes allowable tolerance values are determine from the actual part measurements and then applying the circularity tolerance to create the acceptable zone.

 

​An acceptable part must fall within the stated tolerance.

Cylindricity

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Cylindricity determines the allowable variation of all surface elements located along the entire length of the specified feature.

Cylindricity can only be applied to cylinders.

The tolerance zone cylinders are determined from the overall feature maximum actual measurement and then applying the cylindricity tolerance to create the acceptable zone.

The cylindricity tolerance zone cannot exceed the size tolerance zone.

 

​An acceptable part must fall within the stated tolerance.

Perpendicularity

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Perpendicularity determines the allowable variation of all surface elements located between two parallel planes that are 90 degrees from the datum plane.

The spacing of the parallel planes is set at the specified perpendicularity tolerance to create the acceptable zone.

One of the parallel planes is set based on the actual part surface high or low point. The other is set parallel to the first one a distance away equal to the specified tolerance.

 

​An acceptable part must fall within the stated tolerance.

Angularity

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Angularity determines the allowable variation of all surface elements located between two parallel planes that are at an angle other than 90 degrees to the datum plane.

The spacing of the parallel planes is set at the specified angularity tolerance to create the acceptable zone.

One of the parallel planes is set based on the actual part surface high or low point. The other is set parallel to the first one a distance away equal to the specified tolerance.

 

​An acceptable part must fall within the stated tolerance.