Fanuc program for a 2 7/8 EUE male thread

For Oilfield lathe programmers or other knowledgable machinists.

A customer has won a contract to produce an oilfield tube or pipe of sorts that has a stub acme at one end and a 2 7/8 EUE male at the other end. I'm looking for a sample program (fanuc) to use as a guidline for producing said thread (turning and threading) that will show thread profile. I havent had much success searching this type of thread on google and haven't produced one in over 10 years. Or if someone knows of a link that gives specs for machining thread. API gauges have been ordered to check threads but not yet recieved. Thread uses an 8 round insert and is 3/4 taper per foot. Part will be manufactured on a milltronic lathe.

thankyou in advance for any replies

I don't know if anyone is going to give you the code for it, but my best advice is turn the od straight. Don't forget about the 25 degree chamfer (iirc) on the front.

And just triple check your thread height over distance ratio for the proper angle.

Ie. if you start .300 away from the face of the part, and you thread to 2.125. Then your total thread length is 2.425.

Multiply that by .03125 (which is the tan of 3/4 tpf).

So, your thread taper height should be .0758 (.07578125)

That way your thread taper is perfect, and you have as many full profile threads as possible.

YMMV

Thankyou , best results I've personally seen is when API specs for turning od to correct geometry prior to threading is used, turning outside straight never occured to me as I have not done that way before. When I was in Alberta there was a lot of shops producing various linepipe and EUE threads that had information concerning geometries for each thread. Some shops had gauges for not only each thread but a corresponding taper gauge. Granted it was late 80's early 90's and things may have changed somewhat. I'm not really looking for the code but more the geometries of the turning itself, which I am not able to locate online. This being Windsor not a lot of oilfield related resources here but I'm sure with some digging I will find what I need .

As for programming do exactly what you would for an NPT or line pipe thread as the ¾” per foot taper is the same and the root/crest radiuses will be formed by the insert. All you really need is a gauge to obtain correct standoff.

If you spring for the API book specification 5B figure 8 shows a visual of API rounds, and table 13 shows external upset tubing thread dimensions.

Little.one.der suggests turning a straight OD, but doesn't say why. When I've cut tapered threads, I cut the OD/bore on a taper first. If left as a straight diameter, the depth of the thread at the face end that needs to be removed by the threading insert is much greater. Since it's just as easy to cut the OD or bore tapered as straight, I see no advantage in leaving it straight. I think the tapered surface is easier on the threading tool.

My only experience with API threads was a couple of years ago. I was hired to set up a turn-key lathe to cut 10-round inside and outside threads. I knew nothing when I started. I used a topping insert, so the full thread form is cut by the threading tool. In this case, having a straight OD or ID would still allow a good part, but it means the effective depth of the thread at the face end is much deeper when beginning, meaning more threading passes so the tool isn't overloaded when starting. Perhaps I'm missing something, but the threads I ended up with were beautiful, if I may say so myself. The customer was ecstatic, as the parts looked waaaay better than the ones that another shop had been making for him. One of the keys was using the proper go/no go guage.

As Curt said, the API book had the specs and detailed drawings of all the threads. I recall it was about $100 for about 70 pages. I only needed 2 pages, but it was worth the price.

Zep,

In all of the years I've been involved with API tubing threads, I've never programmed one. But I know from the experts I worked with, they always blanked the tapered part of the OD .010" oversized, minus .010" on ID threads. Threading tool was started about .200" from end of part, and on .750 taper per foot, started making passes. Three hog passes, one to two finish passes to get it to gage. Yes, they used full topping inserts, laydown type perferred.

Ken

Dear Zep,

This is the program that we use at our machine shop for hitting the 2-7/8 EUE Pin connection.

Hope this helps.

Sajith.

Can anyone tell me where to buy the book?

Thanks!

machinist360 said:

Can anyone tell me where to buy the book?

Thanks!

Click to expand...

Here:

IHS - Document Details

I'm looking for help with the same program but I can't see the file you attached, new to the forum trying to figure it out?

Seanthony82 said:

I'm looking for help with the same program but I can't see the file you attached, new to the forum trying to figure it out?

Click to expand...

278EUEPIN
N1
G00G28U0.0
G00G28W0.0
T0300
G50X21.999Z37.427
T0308
G40
G00X10.0Z12.0
X-1.0Z10.0
G01G98Z1.0F99.0
G04X3.0
Z3.0
Z5.0
X10.0
M00
T0300
G00G28U0.0
G00G28W0.0
M01
N2
G0G28U0.0
G0G28W0.0
T0900
G50X21.590Z37.220
T0902
M41
G97S250M03
G40
G00G42X5.0Z5.0
G01G98Z1.0F99.0
G01G98Z0.1F50.0M08
G01G98Z0.02F40.00
G01G99G41X1.0F0.012
G00Z0.1
G00G42X4.65
G71P10Q11U0.06W0.005D1200F0.014
N10G00G41X2.7187
G01G99G42X3.005Z-0.207F0.012
X3.125Z-2.125
G01X3.127Z-3.125
G02X3.9625Z-3.9516R1.0
G03X4.800Z-4.7653R1.0
G01X4.80Z-5.0
X5.40
N11G0G41Z0.1
G70P10Q11F0.012
G00G40Z2.6M09
X15.0Z10.0
T0900
G0G28U0.0
G0G28W0.0
M01
N3
G0G28U0.0
G0G28W0.0
T0900
G50X21.590Z37.220
T0903
M41
G97S300M03
G40
G00G42X3.35Z2.0
G01G98Z0.5F99.0
G01G98Z0.0F50.0
M08
G01G99G41X2.0F0.012
G00G40Z0.1
G42X2.718
G01G99X3.005Z-0.2071F0.012
X3.125Z-2.125
G01X3.125Z-3.125
G02X3.9625Z-3.9516R1.0F0.01
G03X4.80Z-4.7653R1.0
G01X4.80Z-5.0F0.012
X5.40
G00G41Z2.0M09
G00G40X10.0Z5.0
G00Z10.0
T0900
G0G28U0.0
G0G28W0.0
M01
N4
G00G28U0.0
G00G28W0.0
G40
T0100
G50X22.540Z37.170
T0104
M41
G97S220M03
G0X3.625Z5.0
G0Z1.0
G92X3.125Z-2.125I-0.0986F0.125
X3.115
X3.105
X3.095
X3.085
X3.075
X3.065
X3.055
X3.045
X3.035
X3.030
X3.025
X3.020
X3.015
X3.010
X3.005
X3.000
X2.995
X2.990
X2.985
X2.980
X2.977
X2.975
X2.974
X2.973
X2.972
X2.971
X2.970
G92X2.969Z-2.125I-0.0986F0.125
G0G40Z5.0M09
X15.0Z10.0
T0100
G00G28U0.0
G00G28W0.0
M01
N5
G00G28U0.0
G00G28W0.0
T0200
G50X42.337Z33.580
T0205
M41
G97S250M03
G40
G0G41X2.20Z2.50
Z2.0M08
G01G99Z0.1F0.04
/G71P31Q32U-.04W.005D900F.012
N31G00G42X2.725
G01G99G41X2.40Z-0.0625F.012
N32G0G42Z0.1
/G70P31Q32F.012
G00G40Z2.0M09
X10.0
T0200
G00G28U0.0
G00G28W0.0
M01
M30
%

Click to expand...

That's what was in post #7 from 9 years ago

Dear friends i need 2-3/8 tubing thread drawing details any one have.