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      <title>Conventional Right-Hand Rule</title>
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      <div class="title_topic2" id="xps10_pagetitle">Conventional Right-Hand Rule</div>
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      <p class="para_topic">The conventional right-hand rule is, that if the origin of the coordinate system is in the palm of the right fist, with the back of the hand lying on a table. The outward extension of the thumb corresponds to the positive X-axis; the outward extension of the index finger corresponds to the positive Y-axis, and the upward extension of the middle finger corresponds to the positive Z-axis.</p>
      <p align="center"><img align="bottom" src="graphics/int_righthand_1.gif"></p>
      <p class="para_topic">The Conventional Right-Hand Rule</p>
      <div class="title_division">Right-Hand Rule for Rotation</div>
      <p class="para_division">The right-hand rule for rotation is used to associate vectors with directions of rotation.</p>
      <p class="para_division">When the thumb is extended and aligned with a given vector, the curled fingers determine the associated direction of rotation. Conversely, when the curled fingers are held so as to indicate a given direction of rotation, the extended thumb determines the associated vector.</p>
      <p class="para_division">For example, to determine the counterclockwise direction of rotation for a given coordinate system, the thumb is aligned with the ZC axis, pointing in the positive Z direction.</p>
      <p class="para_division">Counterclockwise is defined as the direction the fingers would move from the positive X to the positive Y-axis.</p>
      <p align="center"><img align="bottom" src="graphics/int_righthand_2.gif"></p>
      <p class="para_division">The Right-Hand Rule for Rotation</p>
      <div class="title_division">Intersection Point</div>
      <p class="para_division">In normal usage, an <em>intersection of two curves</em> is the point at which the curves physically meet. In NX, curves that do not physically meet may also be intersected.
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      <p align="center"><img align="bottom" src="graphics/int_righthand_3.gif"></p>
      <p class="para_division">Example Intersection Point</p>
      <p class="para_division">In the figure above, the second curve (C2) selected is swept or projected along the direction of the ZC axis to form an imaginary sheet body. The first curve (C1) selected is then intersected with this sheet body; the point (P1) obtained is called the &quot;intersection point&quot; of the two curves.</p>
      <p class="para_division">The intersection point always lies on the first curve selected unless the two curves intersect in the usual sense. In that case, this intersection point will lie on the second curve selected.</p>
      <p class="para_division">If the ZC axis is perpendicular to the screen, the intersection point will appear to lie on the second curve, though it actually may not.</p>
      <p class="para_division">Extending the definition of &quot;intersection&quot; in this way actually gives you the capability to intersect any curve with a plane (by orienting the ZC axis correctly and selecting a line as C2).  </p>
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