Richard,

The equation for true position is 2 multiplied by the square root of the (X
axis squared plus Y axis squared ).  There is also a true position chart
that can be used to easily find true positions. Because you are specifying a
.009 true position location tolerance there really is no equal +/- value for
each axis. The true position value is dependent on the relationship of each
axis. However, to give you a middle of the road starting point, a True
position of .009 equates to about +/- 0.0032. This is actually a true
position of .00905.

Hope this helps,

Ed Cosper
-----Original Message-----
From: Richard Hamilton <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Wednesday, June 02, 1999 4:56 PM
Subject: [TN] True Position


>Hello all,
>
>I am sure this one will stretch the memory!! I used to know the specifics,
>but when you don't use something, well, it kinda goes away!
>
>We have a hole position tolerance of .009"TP (True Position). Can anyone
>tell me how to convert this tolerance into an X-Y location value? Like,
>based on the zero datum you are allowed a maximum of .003" x .003" off the
>defined location. Or, you are allowed a maximum of .006" in any direction
>combination which represents the .009"TP.
>
>The only number I am using from actual is the .009"TP. Taking that
tolerance
>and defining the location values allowed is what I am having a tough time
>finding out.
>
>Thanks to anyone who can save me here!
>
>Richard Hamilton
>Clemar Mfg. / Rain Bird
>[log in to unmask]
>
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