ONLINE GLOSSARY

0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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• Unfold. To create a development for a three-dimensional object or surface composed of flat faces or "facets" (or to create a development that approximates a sphere). The object is "unfolded" into order to flatten it. See also Develop, Unroll.
  
  
• Uniform Cross Section. Having a cross section that does not change in shape but may change in size along the length of the object. Objects with a uniform cross section are often easy to draw because the cross section merely needs to be scaled at different points along the length of the object. It may also be possible to create such an object using the lofting tool of a spline-based 3D modeling program.
  
  
• Unroll. To create a development for a three-dimensional object or surface such as a cylinder with rounded surfaces. The object is "unrolled" into order to flatten it. See also Develop, Unfold.
  
  
• Usable Depth. The depth of a bored hole that includes only the cylindrical portion of the hole. Most drill bits have tips that are angled at 120 degrees, creating a cone-shaped depression in the bottom of the hole. The usable depth does not include the cone-shaped space occupied by the tip of the drill bit when it bottoms out in the hole. See also True Depth.

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0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Click on a letter to browse through the Glossary terms.
To download a printable version of the entire Glossary, click here.

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Reproduction, in whole or in part, is prohibited without written permission from the publisher.