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Actually true position is most often a certain distance from a certain place so [place + or - distance = position] is the correct formula. To confirm look it up in a book..If you cant find a book to confirm then write one and it will be a big help to everyone who can't find position,
True position is most often used on holes and, therefore, will include the diameter symbol. In such a case, the position deviation is multiplied by two. (see formula). If the feature is a slot, then this symbol will be omitted. Position Tolerance: The maximum allowed deviation from the theoretical position.
A true position of .001 between the same two surfaces would allow only .001? Is this the reason the true position callout is popular on round features, rather than a smaller concentricity callout. I think the total runout callout of .001 also limits the roundness of each feature, and their shared axis of rotation.
Through the Pythagorean theroem and such you do the formula SQRT(x squared + y squared) to find the hypotenuse and you end up off 5 from your intended 0,0 target. However, the way true position callout works, the formula is 2*SQRT(x squared + y squared), thus putting you off 10 (even though we just established that you were really only off 5).
Then after you get coordinates of actual center of the hole [x,y,z] you can calculate position deviation using the formula: sqrt [ (x-X)^2+ (y-Y)^2+ (z-Z)^2)] Side note: primary datum feature does not have to be always perpendicular to the axis of the hole. It is just the most common situation, but it is not the rule.
B4 does give the equations for calculating position tolerance from the sizes of the male/female components. The equation you give is for converting +- coordinate dims to position, instead 14.5 concentrates on determining the pos tol from true function, hence B4.
Anyway, true position is a trig function. You have X and Y axis (usually) take the value that your hole is off in each axis. Square them, then add them together, then take the square root of the answer. Your true position will be the hypotenuse: (X^2)+(Y^2)=(hypotenuse^2) then take sq rt of hypotenuse to get true position. In other words: (A^2 ...
JLang17. You need to times 2 ( X2 ) on your equation above to get the correct data. There are two simple ways to get the positional tolerance : 1. Positional tolerance = Overall Plus / Minus tolerance X 1.4142. Example : ±.01 = Overall .02 tolerance. Positional tolerance Ø = .02 X 1.4142 = .0283. Overall Plus/Minus Tolerance = Positional ...
You have referred to basic dimensions - this is just a means of defining true position (or true profile), it does not somehow fix the coordinate system to be utilized. If these dimensions have been specified as a pitch circle and angle they can be easily converted to (x,y) rectangular coordinates and back again using the standard equations ...
When calculating the true tool position for a radius element of the Workpiece, you need to calculate the location of the TNR centre, then add or subtract either one or both of the following depending on how the cutting tool is set. 1. one TNR for Z 2. two TNRadii for X