Automotive deviation symbols do not match?

[kevin strine]

How can i get the automotive deviation symbols to match?
The symbols are stating that the part is back in the X direction.(which it is)
But the T value states that it is Forward.
Is there a toggle someware that switches this.
This is the same for edge points or surface points. (The symbol for the S is correct on the edge point.)

3.5 MR2
Global image 09-20-08
sp600
Metris LC50

[rangerboat72]

If I understand your question correctly you cannot do that. The T value tells you whether it + or - material.

[kevin strine]

But the deviation symbol is attached to the T on the inspection report.
What i am asking is why does the symbol for the T read opposite?

[rangerboat72]

Because it is plus material.

[Matthew D. Hoedeman]

The "T" will read POSITIVE if the surface you just checked is too CLOSE to the "FROM" position of the probe, indicating too much stock, or a touch TOO soon. A minus value indicates too little stock or the surface being AWAY from the start positoin of the probe. It has NOTHING to do with body position/direction. It is simply telling you too close or too far away from the start postion of the probe.

Now, If you are checking from the 'rear' of the part (ie the back of the vehicle) you will get a POSITIVE X deviation and a POSITIVE T deviation for a 'heavy stock' condition. If you are checking from the 'front' of the part, you will get a NEGATIVE X deviation and a POSITIVE T deviation for a 'heavy stock' condition. That's just the way it is. The XYZ axis give you CAR POSITION, the T gives you 'stock' and TOTAL VECTOR deviation, and since there are 3 axis, it is a total of all 3, so, unless you are checking something that is absolutly sqaure to a body line, you will have deviations in all 3 axis, so, will it be AFT, HIGH or OB?

[rangerboat72]

The "T" will read POSITIVE if the surface you just checked is too CLOSE to the "FROM" position of the probe, indicating too much stock, or a touch TOO soon. A minus value indicates too little stock or the surface being AWAY from the start positoin of the probe. It has NOTHING to do with body position/direction. It is simply telling you too close or too far away from the start postion of the probe.

Now, If you are checking from the 'rear' of the part (ie the back of the vehicle) you will get a POSITIVE X deviation and a POSITIVE T deviation for a 'heavy stock' condition. If you are checking from the 'front' of the part, you will get a NEGATIVE X deviation and a POSITIVE T deviation for a 'heavy stock' condition. That's just the way it is. The XYZ axis give you CAR POSITION, the T gives you 'stock' and TOTAL VECTOR deviation, and since there are 3 axis, it is a total of all 3, so, unless you are checking something that is absolutly sqaure to a body line, you will have deviations in all 3 axis, so, will it be AFT, HIGH or OB?

You are so much better (or have a whole lot more time on your hands than I do) at explaining things than I am. I was just waiting for you to jump in and fill in the blanks...

[kevin strine]

I am completely aware of the use of T vectors however, when you do a screen dump then show it to your customer and have to explain that the X deviation in this case is Back but the T deviation is Forward, it is some thing that I should not have to explain to the customer that i have no control over and to ignor the T vector deviation symbol. If you print out just the T vertor then you will have the results being in the wrong direction.

[kevin strine]

If I am using an edge point Function the T deviation reads backwards (the x=+ B and The T=- F (back Vs Forward)
But the S deviation reads correctly.(even know that the x=+ B and The S=- B)(back vs back)

[kevin strine]

I have been informed that version 3.5mr2 has a bug in it and you cannot change the deviation symbols.

[Glenn]

T values have no relevance whatsoever to XYZ or body coordinates. They are only in relation to part material, similar to SPC indicator checks. If the material is farther from the SPC bushing than it should be, it is negative (-). If the material is too close to the bushing it will be a positve number. Think this way and it is easier to understand...

[kevin strine]

I understand what the T is all about however my Original question was why did they put an automotive deviation symbol in 3.5mr2 that reads backwards.
They should not have put a deviation symbol for the "T"

[Glenn]

Then you are saying the F/B, I/O, and L/H don't agree? I seldom use those but if they are not reading correctly it wouldn't surprise me too much. I am not sure if I have used them more than a couple of times ever, they will confuse the issue with Y deviations for sure. Y positive or negative, In or Out and T vectors (relating to surface normals primarily Y) will get pretty confusing to the average customer unless he/she is quite CAD oriented.