More fuel for the fires of confusion:
If you have to place a hole within 9 mil of its perfect location (true
position) it seems that you are allowed to be off by 9 mil in any direction.
If you can only measure x and y errors and they have to fall inside that 9
mil true position spec, they can be 9 / root(2) = 6.36 mil positive AND
negative, compared to 9 mil true position.
Did I goof?
Regards, Ahne.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jay Solderberg
Sent: Thursday, June 03, 1999 7:14 AM
To: [log in to unmask]
Subject: Re: [TN] True Position
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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