Richard,

Ed has the formula correct.  However, maybe an easier way to think about it is to take the diametric true postion and multiply by 0.3535 to arrive at the bilateral (+/-) tolerance.  In your case, 0.009 X 0.3535 = +/- 0.0032.

Jay Soderberg


Remember,  all opinions expressed above are mine and mine alone.  They do not necessarily reflect the opinion of the ownership or management of this radio station.


>   ------------------------------------------------------------------------
>
> Subject: Re: True Position
> Date: Thu, 3 Jun 1999 08:18:10 -0400
> From: Ed Cosper <[log in to unmask]>
>
> 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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