T value

[dwade]

I read a post this week or last explaining the T value. Tried to search but had no luck.

Could someone explain it again. Trying to explain T values in programs for XS material or short on stock and can't remember whether +T = more material or +T = less material.

Duane

[Peter Warcholyk]

You have it correct.

+ T = more material

- T = less material

ZydecoPete

[jjewell]

Duane,

There is a mathematical explanation also, maybe someone will post, but I use the KISS rule when explaining to clients.

If the probe hits a surface before it gets to the nominal, its plus stock or +T value, if the probe travels past the nominal position before it gets to the surface it is missing stock, or - T value. This is all regardless of work plane, + or - x y or z...

HTH,

[johnnyrocket]

I'm familiar with the formula for calculating the T value as being....

(DX x I) + (DY x J) + (DZ x K)

I know this is valid and it works. I've also been told this is referred to as the dot product.

Could any of you mathemeticians out there confirm this formula with some valid documentation? It would be useful to have something to refer to when explaining T value to our engineeers.

Thanks,
John

[rangerboat72]

I'm familiar with the formula for calculating the T value as being....

(DX x I) + (DY x J) + (DZ x K)


Thanks,
John

If I'm not mistaken (which I may very well be), I believe it is 3*square root of (DX x I) + (DY x J) + (DZ x K) similar to the calculation of a diametrical true position but including a 3rd axis. Someone please correct me if I am wrong...

[dwade]

You have it correct.

+ T = more material

- T = less material

ZydecoPete

Thi is really what I was needing. I was trying to put some kind of vebage into the program to let the machinists know what adjustments needed to be done to make the parts right.

Thanks to all.

Duane

[Paul Barriage]

Tools are good

I use a Brown & Sharpe vector tool for demonstrations.

The large end is placed on the surface or edge. The small end points to + or early hit.

http://baggy3.info/Tee2.jpg

[Quality4you2]

t-values

Here is a example of the formula to figure T value