Tan Plane
Tan Plane
(OP)
Is it possible that someone in this forum might be able to give me a link (?) to an example of 'tan plane', as defined in ASME Y14.5-1994, being used on a part?. I am searching for a 'real world part' rather than a partial example in text or training manuals. I am trying to improve my understanding of Y14.5 and how it relates to geometry.
TIA,
TIA,





RE: Tan Plane
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RE: Tan Plane
RE: Tan Plane
If one had a 45 degree angle with a +/- 30 minute tolerance, the shop floor would use a protractor and contact tangent to the axis or high points and read the actual angle from the protractor. This is an axis and not a plane.
On a tangent plane, one would need a checking flat the exact size of the plane. Place the checking flat on the plane then then check the tilt in both directions (both axis)and report the highest reading. Tangent plane just takes the flatness out of the equation.
If you think people don't understand GD & T now, just place a "T" with a circle around it and insert it in the feature control frame after the tolerance and watch the reaction.
There ARE good uses but I don't believe that we are at that level yet in industry. This forum kind of proves it.
Dave D.
RE: Tan Plane
In the drawing we want to control the lowest point of the terminal insulation crimp relative to datum J (box of the receptacle). This controls the "bend" of the crimped terminal in one direction. Since the form of the insulation crimp can vary from sample to sample, indicating a specific point is not funcionally feasible.
[IMG]http://img
RE: Tan Plane
Who and why was the tan suggested?.
The drawing in in accord with Y14.5-1994, correct?
RE: Tan Plane
Looking at the drawing, since datum J is on the same plane, one should have placed phantom lines between datum J and the feature. Do not use a basic dimension of 0. I could not find datum E either??
Profile of a surface controls the angle of the surface, flatness and location all in one.
Dave
RE: Tan Plane
RE: Tan Plane
The phantom line instead of 0.00 BASIC makes sense. Thank you.
The objective was to control how high or low the surface identified by the profile of a line can shift relative to datum J. Essentially we want to control how much the terminal can bend about the insulation crimp. One problem is that the insulation crimp is a very imperfect surface who's shape can vary substantially from sample to sample
One mistake was assuming that the tangent would always be a point that a plane parallel to datum J would contact.
If I changed the profile of a line to parallelism, would that make this correct? (I'm thinking not)
What method might be best for my purpose?
RE: Tan Plane
Dave
RE: Tan Plane
2. [IMG]http://i13.tinypic.com/2hxajnt.jpg[/IMG]
3. [IMG]http://i14.tinypic.com/2mcuh6w.jpg[/IMG]
4. [IMG]http://i14.tinypic.com/4c8e7ix.jpg[/IMG]
Chris
SolidWorks 06 4.1/PDMWorks 06
AutoCAD 06
ctopher's home (updated 10-27-06)
RE: Tan Plane
Tan used to mean contact between a plane and either a point or a element of a curved surface. Now it seems to be redefined as contact between a plane and counterpart of the feature surface. One example cites its application as working on either concave or convex surfaces.
One text defines Tangent Plane-A theoretically exact plane derived from the true geometric counterpart of the specified feature surface.
And Datum-A theoretically exact point-plane or axis derived from the true geometric counterpart of a specified datum feature. (Not a whole lot of diff)
The examples from ctopher appear similar to one in the Y14.5. They are missisng the view that would show the 'depth' of the part, for one thing.
I cannot accept the idea of orienting a plane as stated in the summary. Somehow it just don't fit!
RE: Tan Plane
Opinions?
RE: Tan Plane
This does the same thing as datum targets would but without having to specify a particular point of contact.
David