HELP PLZ---Thread height chart---

[Wiseco]

I have an Haas TL-2 and I want to code a threading feature.

In the workbook of haas, it have a thread height chart that is supposed to tell me what value to put in K("O.D. Thread Single depth "k" Thread Height"). The chart tell me to put .0341 in K for an 9/16 NF. After testing it, I saw that the thread isn't deep enought.

I tryed with the conversational mode :

It gave me this code :
G76 X0.4964 Z-0.75 K0.0531 I0. D0.0095 F0.0556
Can someone help me to understand something about that???

The logic in my mind tell me that the K value must be 0.5625-0.4964 which is 0.0661, as K is a radius measure but the machine work with diameter measure... What do you think?? My work is stop by now... I hate to not understand something, I MUST FIND WHAT'S THE PURPOSE OF THAT K!!! Don't you think as when we enter a minor diameter, the tool MUST reach that value????

Help me guyz cause I'm lost!

[wizard]

Don't have a HAAS so I can't help. There is however a HAAS Discussion thread that is a permant fixture in this forum. That might be a good place to pose the question.

Dave

[little bubba]

Wiseco, I don't know a damn thing about Haas's, but, thread height is pretty simple, take your major diameter and subtract the average pitch diameter your trying to hit. Back it off a bit and give it a shot, leave it in the machine, and use whatever is your favorite way of measuring threads, adjust and rerun.

As for radius and diameter confusion, every machine I've ever worked on wanted thread height in radius, as in the actual thread height.

Why is your thread big, simple, its not an exact science(I guess it can be, if you want to waste the time), its not like turning a simple OD or ID. The main factor is your root radius of your cutting tool, that is basically what screws everything up. Cut it big, LEAVE THE PART IN THE MACHINE, measure, adjust the thread height or make an offset, rerun, remeasure and you should be ready to go.