GD&T Positional Example

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Example</I></div> <div> <TABLE BORDER="2" CELLPADDING="2" CELLSPACING="1" WIDTH="668" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" ALIGN="BOTTOM" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 41 WIDTH="71"><div> <B>HOLE NO.</b></div> </tD> <tD VALIGN=TOP WIDTH="71"><div> <B>HOLE</b></div> <div> <B>MMC</b></div> </tD> <tD VALIGN=TOP WIDTH="71"><div> <B>HOLE</b></div> <div> <B>ACTUAL</b></div> </tD> <tD VALIGN=TOP><NOBR><div> <B>POSITION</b></div> <div> <B>ALLOW.</b></div> <div> <B>(Part Print)</b></div> </NOBR></tD> <tD VALIGN=TOP WIDTH="41"><div> <B>"X"</b></div> <div> <B>DIM.</b></div> </tD> <tD VALIGN=TOP WIDTH="42"><div> <B>"Y"</b></div> <div> <B>DIM.</b></div> </tD> <tD VALIGN=TOP WIDTH="137"><div> <B>POSITION</b></div> <div> <B>ACTUAL</b></div> <div> <B>(Machined Part)</b></div> </tD> <tD VALIGN=TOP><NOBR><div> <B>ACCEPT.</b></div> </NOBR></tD> <tD VALIGN=TOP><NOBR><div> <B>REJECT.</b></div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 16 WIDTH="71"><div> 1</div> </tD> <tD VALIGN=TOP WIDTH="71"><div> .375</div> </tD> <tD VALIGN=TOP WIDTH="71"><div> .375</div> </tD> <tD VALIGN=TOP WIDTH="78"><div> .020</div> </tD> <tD VALIGN=TOP WIDTH="41"><div> .002</div> </tD> <tD VALIGN=TOP WIDTH="42"><div> .003</div> </tD> <tD VALIGN=TOP WIDTH="137"><div> .0072</div> </tD> <tD VALIGN=TOP WIDTH="47"><div> x</div> </tD> <tD VALIGN=TOP WIDTH="42"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="16" ALIGN="bottom" WIDTH="42" HSPACE="0" VSPACE="0"></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 16 WIDTH="71"><div> 2</div> </tD> <tD VALIGN=TOP WIDTH="71"><div> .375</div> </tD> <tD VALIGN=TOP WIDTH="71"><div> .378</div> </tD> <tD VALIGN=TOP WIDTH="78"><div> .023</div> </tD> <tD VALIGN=TOP WIDTH="41"><div> .004</div> </tD> <tD VALIGN=TOP WIDTH="42"><div> .010</div> </tD> <tD VALIGN=TOP WIDTH="137"><div> .0215</div> </tD> <tD VALIGN=TOP WIDTH="47"><div> x</div> </tD> <tD VALIGN=TOP WIDTH="42"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="16" ALIGN="bottom" WIDTH="42" HSPACE="0" VSPACE="0"></tD> </tR> </TABLE></div> <bR> <div> One of the primary applications of positional tolerancing is related to bolt hole pattern locations.  The advantage of this method accurately describes the functional requirements of mating hole patterns.</div> <bR> <div> <TABLE BORDER="0" CELLPADDING="2" CELLSPACING="1" WIDTH="663" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" ALIGN="BOTTOM" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 428 ><NOBR><div> <IMG SRC="1648fa60.jpg" border=0 width="655" height="422" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </NOBR></tD> </tR> </TABLE></div> <div> <B>Above is a part drawing showing ONLY the necessary dimensions for the positional tolerance example.</b></div> <bR> <div> The image below represents an actual part with the hole sizes and locational dimensions.  Also, the formula for the actual position is included within the image to determine if each hole falls within their positional allowance. </div> <bR> <div>                           <FONT SIZE="2" COLOR="#000000" FACE="Arial" >NOTE:  Let "X" = horizontal dimensions & "Y" = vertical dimensions.</FONT></div> <bR> <div> <TABLE BORDER="0" CELLPADDING="2" CELLSPACING="1" WIDTH="664" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" ALIGN="BOTTOM" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 439 ><NOBR><div> <IMG SRC="0da94b10.jpg" border=0 width="660" height="433" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </NOBR></tD> </tR> </TABLE></div> <div> Both holes fall within the positional allowance.  Hole number two has a bonus tolerance of .003.  When this happens, it is added to the .020 positional tolerance within the feature control frame.  This is why the positional allowance on number two is .023.</div> </td> </tr></table></body>