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      <title>Centerdrill</title>
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      <div class="title_topic3" id="xps10_pagetitle">Centerdrill</div>
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      <p class="para_topic">Centerdrills are straight shank twist drills often used to center the ends of shaft type workpieces. They have short flute lengths, short overall lengths, over sized shank diameters and are therefore rigid. They are used to increase the location accuracies of holes being machined.</p>
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               <p class="para_th">Tool Parameters</p>
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               <p class="para_th">Description</p>
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               <p class="para_td">(D) Diameter</p>
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               <p class="para_td">The largest diameter of countersink that could be created by the tool. It also indicates how large a hole could be deburred by the tool.</p>
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               <p class="para_td">(L) Length</p>
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               <p class="para_td">Maximum length that can be used for machining. </p>
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               <p class="para_td">(IA) Included Angle</p>
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               <p class="para_td">Included angle of the lower countersink portion of the tool, see the tool shape.</p>
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               <p class="para_td">(BA) Bell Angle</p>
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               <p class="para_td">Included angle of the upper countersink portion of the tool, which is adjacent to the body of the tool.</p>
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               <p class="para_td">(BD) Bell Diameter</p>
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               <p class="para_td">This parameter represents the largest diameter of the bell shape.</p>
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               <p class="para_td">(TD) Tip Diameter</p>
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               <p class="para_td">The smaller diameter of the tool that clears out material for the center web of the incoming drill.</p>
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               <p class="para_td">(TL) Tip Length</p>
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               <p class="para_td">Describes the length of the cylindrical portion of the tip.</p>
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               <p class="para_td">(PA) Point Angle</p>
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               <p class="para_td">The included angle at the tip end of the tool.</p>
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               <p class="para_td">Number of Flutes</p>
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               <p class="para_td">Centerdrills usually have two flutes.</p>
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