
I would like to apologize to the Cove for not responding sooner with my evaluation of the ThreadTech and STETFS software. My 85 year old mother has been ill and in the hospital for a couple of weeks. When they finally got her well enough to go home, I stayed with her to continue her recovery. I just came back to my own home and my job last week, so I have been a little pre-occupied.

But I am back now and ready to offer up my objective opinion on these programs. I was a little distressed to learn that the demo version of ThreadTech is not the lastest. That may explain some of the concerns I had.
Both programs are very good and appear to be based on the standards (I only checked a few different thread types and sizes). They both offer printed reports of the data in a logical fashion. I am afraid that is where the similiarities end.
ThreadTech should be used by anyone who needs standard thread data and who has the right size of thread wires. I did not see a way (maybe it will be in the new version) to use the software to calculate special threads or determine constants for non-standard thread wire sizes. Like I said, if you only need information for standard threads, this is the program to pick. It is very simple to use (which is hard to find in software today) and only takes a few key strokes to get the information you need.
When I went to download the demo I realized that I had looked at this program years ago when I was shopping around for thread software. The lack of versatility (being able to calculate data for special threads and wires) was the reason why I did not select it then.
STETFS should be used by anyone who needs special thread data in addition to standard thread data. One of the hardest things to get used to is that you just don't click on an icon and have the program open. The icon opens an explorer window and then you select the file by the thread type that you are interested in. If you need information on a different thread type you must close that file and open the other one. Once you get used to it, it only takes a few extra seconds to go from UN threads to NPT.
STETFS should not be used by amateurs or anyone with a weak heart.

There are a whole bunch of screens to go through before you can get the information you need. You also have to start from the beginning each time you are looking up different size threads for the same thread type. This can be a very frustrating process until it is understood and mastered.
At this point, it sounds like I should not have purchased STETFS four times. But in reality, there is only one reason that I bought STETFS over ThreadTech or any of the others and that reason is flexibility. Many times I have run across a PD callout on a drawing that was not to the standard. What is the major or minor diameter for that PD? STETFS will tell you that and more. Ever wonder what happens to the PD of a buttress thread when the 7 degree and 45 degree angles are off. STETFS will tell you. (And believe me that process was not pretty when I had to explain all of that to the tool maker and the product engineer!

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There is no comparison between these two programs. Both serve their designed purpose well. Your question should be what do I want from the software. Standard and simple go with ThreadTech. Dealing with non-standard threads and willing to put up with a little more time in front of a PC go with STETFS.

I would like to caution everyone. Using this software will make you lazy. You should look up some information in the standards (or other appropriate source) and compare it to the data from the software. Not so much to check the software, but to make sure that you understand where the numbers are coming from. A mind is a terrible thing to waste.
Wayne (and all other interested parties), I hope I gave you enough detail. I looked at the programs from the end user's viewpoint, not programming steps or whatever you call it (I know nothing about that kind of stuff). Thank you for asking me to do this. I hope I did it justice.