Bill as an engineer, your sure not acting as one.... and I will not trade insults with you
Tos, the reason we describe them as "sharp" is no one seems to understand what NPTF was. We had several emails asking what it means.
The threads are standard, however MANY NPT fittings are not.
The starting size of the thread varies among fittings, you need only purchase a few different ones to see this.
Typically this is not an issue in industry, and NPT female ports are often "over cut", to correct for the problem.
If we where to do this, it would cause an increase in pump size, or allow people to force into the impeller.
I suspect you just have a bad cut, although there CNC thread milled on an extremely acurate machine, many things can happen in manufacturing. The insert could be off, the part could slip, etc.
If this continues to be an issue, we will just increase to pump size, and overcut for NPT. G 1/4 will not have this issue, as thread depth / size is constant. Much better for this app.
**Note AVT makes thousands of ABS blocks a month, each of which has 10 thread milled ports, we have some idea how to do it
