tap pitch math off in tool library

[mikeprice_ksbooms]

Is it odd that with a mm tap i can simply enter the pitch, but with a standard tap i have to do the math in the pitch column. Example, a 4mm .7 tap i can put .7 in the pitch field and get a correct answer.( .7/25.4=.0275*rpm.) But a 1/4 20 tap i can not simply put 20 in the pitch column, i have to put 1/20 in their else it takes rpm*20 instead of 1/20*rpm. Is this a post problem?

[programming2C78B]

no, it makes sense. The pitch is 1/20th (0.05) of an inch, not 20in.

[mikeprice_ksbooms]

 I get the math, I don't refer the the tap as a 1/4" .05 tap. It just seems like the post should do that. like it does for the metric taps.

[Garrett_Wade]

I think the difference is...in metric you are giving it the actual number, what you are suggesting is giving it 1/2 of a fraction that it would need to do the math on to find out what the answer actually is. 

Right now I think its just as easy to type in the full fraction into fusion and let it divide it out.

[mikeprice_ksbooms]

Agreed, I usually do a separate tap program by hand but i thought i would give cam a shot. It took a little bit to figure out why i was getting like 4000 feed on a 1/4 20 tap. I did a metric hole first and it worked perfect, then the standard size was all messed up. Just so if anyone else comes across this when starting tapping in cam. Metric pitch put whatever the pitch is and standard 1/pitch for the pitch field. At least in the HAAS post.

[ktorokU233T]

This all comes back to your early terminology training.

Thread Pitch : Distance from a point on the thread to the corresponding point on the next thread as measured parallel to thread axis. For example, distance from crest to crest, root to root, etc.

Threads Per Inch: The number of thread forms per inch as counted parallel to the thread axis.

It makes sense to input pitch if the dialog covers both metric and American threads. It does not make sense to input threads per inch when covering both metric and American threads

[hackish]

I think in this case, the popup explaining thread pitch to the user should include this nugget of information. It would just improve usability.