Okay, my student and I are knocking our heads on the wall. We think we have coded the line to machine a 1" -11.5 NPT thread, but the simulation on the graphics screen appears to be very steep. Any suggestions? 
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Well, we tried G92 instead of G76 and the simulation looked right. so we ran it using the G92, I would still like to know what we were doing wrong. I know it must be a sentax error. I used the same taper calculation for the G92
G92 X1.310 Z-1.0 I-.0547 F0.08696
X1.3
X1.29
X1.28
X1.27
X1.265
X1.26
X1.255
X1.252
X1.252
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Try this.
( TOOL 5: 0.006R X 11-1/2 CRESTING- INSERT)
N3G50
G97G54T0505S2000M3
G0X1.4Z.1M8
Z.0811
X1.5
G76X1.2315Z-.685I-.0239P2K.0657D100E.086957A0
G0X1.4
Z.1
M9
X5.Z6.
M1
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I will have my student give it a shot Monday. @GregNull
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The code you provided did not crash and showed a slight taper for the thread. We did not get to run it on a part. Your D100 was not like our syntax, our manual shows this to be depth of first thread for a Haas machine. It did not appear to change the simulation regardless of D100 or D0.011
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I don’t know if you took the example below the picture and did a copy paste and added your own positions, because in the example I see an error that I didn’t expect to see in a manual or whatever you copied the picture from, but in block n30 there is an error that many do because of the position of the letter O on the keyboard, just below the number 0, done it myself to many times so I double check what i write most of the time, but it still can get pass my blurry eyes. So my advice is to check for O’s and change them to 0 where you need to.
Stephen, the slight angle is the correct angle (1-3/4 deg’s per side) the D is the amount on the 1st cut.The bigger the 1st cut the fewer passes to finish size.
Thank you
Sincerely
Jim Cipolloni
CIPCO Industries, LLC.
Ph (215) 785-2976
fax (215) 689-2172
www.cipcoindustries.com