[automizer]

I am looking to make some manifolds that require a few different NPT threads. ( 1/4, 3/8, 1/2, 1-1/4) I have no problems with NPS but I can't figure out how to mill out a tapered thread. As well I have not looked yet but I do not know the degree of taper for a npt thread. I will be running this threw a Haas control, any suggestions would be appreciated.

[ProProcess]

I believe the taper is 1.78333Degrees from center.
Here is a link to Harvey Tool's site that has the tool you need...

http://www.harveytool.com/products/p...keyword=thread

Scroll to the bottom.
I've used them and they work well.
Good Luck.

[chrisryn]

A npt thread taper according to the machinist handbook is .75" per foot. Depending on which tool you use it should come with software that will generate the code you need.

[ProProcess]

The .75" per Foot is a diametric designation
i.e. the diameter is tapered .75" per 12." of length.
Which in turn work out to be around 1.789 from center.

[chrisryn]

Alot depends on the cutter I thread mill ALOT of pipe threads NPS and NPT. I have a 4"-8 NPT that I use a single point thread mill on it has a special G code that it runs so that it can spiral down to make the taper. I then have a 1.5-11.5 NPT that uses same path as my 1.5-11.5 NPS we just change out the multi tooth insert because the insert has the taper angle on it. There is alot of factors to look at to awnser your question.

[neilw20]

Do on a 4th axis rotary table (if you have one) tilted to the desired angle.
If you have a tiltable head like my SX3 then you can cheat with the helix angle too. Then just use a lathe insert to do the cutting.

[automizer]

Ok so this will not be a simple as I had hoped. I have no 4th axis so that ones out, I'm coding by hand so software is out. A macro maybe?
ProProcess I like those tools that maybe the route I need to go, I have a single point threading tool and I was hopping to use it.

[chrisryn]

I have a threadmilling macro laying around some where let me find it and I'll send it to you.

[Kiwi]

automizer
Attached is a program I have written. This may help.

[dcoupar]

Try this: http://www.vargus.com/vardex/templat....aspx?pCatId=9

[dertsap]

download a demo of machinist toolbox
it has simple cnc functions

[automizer]

Well Now I have some options to try
dertsap I downloaded the demo of machinist toolbox a long time ago and have not touched it maybe I should dig it out.
dcoupar Have you used this software?
Kiwi that is a cool program, what made you write it?
chrisryn if you could find that I would love to play around with it.

[chrisryn]

Well Now I have some options to try
dertsap I downloaded the demo of machinist toolbox a long time ago and have not touched it maybe I should dig it out.
dcoupar Have you used this software?
Kiwi that is a cool program, what made you write it?
chrisryn if you could find that I would love to play around with it.

I use vardex on alot of my threadmilling. They seem to be the only ones that have the type of NPS thread mills I need. There software is a timesaver. Works 99% of the time. Just keep in mind that it usually outputs the threadmill pass in incremental, not absolute.

[Kiwi]

........ I have a single point threading tool and I was hopping to use it.

I use vardex on alot of my threadmilling. They seem to be the only ones that have the type of NPS thread mills I need.......

All I could find was code for their multi point cutters.
Do they have code for tapered thread using single point cutter?

[chrisryn]

hmmm I know I got my code some were let me look at the software I have and see. I am still looking for that macro I had.

[automizer]

I use vardex on alot of my threadmilling. They seem to be the only ones that have the type of NPS thread mills I need. There software is a timesaver. Works 99% of the time. Just keep in mind that it usually outputs the threadmill pass in incremental, not absolute.

I just got a Vardex catalog today im curious what tool holder you use? and what inserts you use?

[shay z]

use their software (you can download it from their site). the program will recommend you the right tool.

if you mill larger diameters try their shell mills.

[chrisryn]

For NPS
Holder :TMC100-5
Insert: 5EI11.5NPSTM2

For NPT
Holder: TMC125-5
Insert: 5EI11.5NPTTM

VBX grade on both inserts
This grade works well on cast iron and cast aluminum

[Kiwi]

For NPS
Holder :TMC100-5
Insert: 5EI11.5NPSTM2

For NPT
Holder: TMC125-5
Insert: 5EI11.5NPTTM........

I couldn't find these holders and inserts in the Vardex catalogue.
What threads are they used for?

[automizer]

I couldn't find these holders and inserts in the Vardex catalogue.
What threads are they used for?

if you have the paper catalogue the holders are on page 229
the inserts are on page 216
I see in the catalogue there is a holder just for NPT there TMN Holder