Again thanks to all of you for your replies, I knew I could count on you. It just makes me feel bad that I am unable to offer any advice to others.

Vargusthread Mill speeds and feeds

My take is multiply the rpm by 25% - you are effectively using six teeth in this cut. It's sort of like over-revving a dovetail cutter in steel.

Thread millcutting parameters

Now here is another question. My thread is 1.181" deep. When I run the process in backplot, it looks like it makes 2 different helixes at different depths in the part. Is this normal? I don't see any parameters on the THREAD MILL page that would change the number of cuts.

Chamfermill speeds and feeds

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There should be a formula is your Val Book I have them in my Vardex Book. But sound slow to mena I would problay be at like 650 SFM but I like it balls to the wall though. Gcode is correct if you were using a single point tool then you would just need more passes is all.

I believe you are telling me that there is no relationship between the feed rate on the TOOL PAGE (x&y motion)and the thread pitch (z motion)on the THREAD MILL page. I think this is what was confusing me the most.

[3] I am using a VARDEX TMMC100-4 124/202 holder which has an effective diameter of .71". The insert has 6 teeth. I had to create a new tool, and it is possible that I have not correctly defined the tool.

I'm assuming your insert has 6 teeth, but only 1 flute (cutting edge). I don't know how deep this trapezoidal thread is, but based on a .002 feed per flute your rpm @390 SFM is 2100 and your feed rate is 4.2 ipm. That sounds like a reasonable place to start.

I look at this way if you can get 1000 holes threaeded in 10 sec a holes and the insert cost you $45.00. If you charge $75.00 an hour shop rate then it cost you $.21 a hole. Now you take 1 min a hole to thread it at the same shop rate it will cost you $1.29 a hole to do the same thing. That mean a difference in just the threaeded holes of almost $1000 I think I will keep doing it balls to the wall and put that $1000 in my pockey.

Well Jack use to do Stainless Steel at 450 Sfm using a much smaller cutter like one for 1/4 npt and never had any problems. I understand your concern about Naval Brass beign tough but I use to cut it like I was cutting Carbon Steel and never had any problems. I would rough all Carbon Steel at 690-980 SFM then usually finish at 1200 to 1600 SFM. But I always use carbide.

AdventThread Mill speeds and feeds

THE BIG QUESTION: How do I calculate the feedrate for the TOOL PARAMETERS page? I have come up with values ranging from .11811ipm to 250.98ipm.

Harvey Toolspeeds and feeds

Well You are apporaching it the right way. I have been threading milling for about 10 years now and blow most people mind when I do it. I think you will enjoy the way mastercam does it. It makes it very easy. I think my name suits me when it comes to doing anything. I feel that push till it break and the back 5% si where i always want to be. I think turing 4150 HT at 900 sfm with a .250 perside cut at .028 feed per rev is safe so all relative to what you have seen.

I think you have cleared up what has muddled my thinking. You stated "the feedrate has no function in forming the thread in threadmilling. You treat it like a one flute endmill".

Single pointthread mill speeds and feeds

Carmexthread Mill speeds and feeds

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ThreadMilling Calculator

I also found the FPM recommendations in the book and I chose the lowest value and will work from there. A lot of you guys scare me witless with the feeds and speeds you use. I can just imagine the shrapnel flying through the air!

The feedrate in x and y have no effect on the pitch of the thread. You can feed it as fast or slow as yoy want. As long as you helix is programmed right you'll get a 3mm thread.

RE Millman^crazy comments: I do have the feed table in my Vardex book, but I think I was confusing the feed rate (along the cutter path) with the rate the spindle was moving in the Z axis to make the helix.

your insert has 6 teeth and your thread is 10 teeth deep. The insert will have to make 1.5 full circles to machine the thread. What you are seeing