Predicting tapping force of screw on tapered threads?

[Bewler]

Quick Summary

Screws on parts are going into tapped holes with optimal cycle time
Specified full thread depth of X1 from top of counterbore
Partial tapered thread depth after X1 as X2

I have a screw that is slightly longer than X1 and I need to understand if a human operator could "thread/tap" the hole past the full thread of X1 in the X2 region.
Goal is to minimize drilling cycle time by not tapping product longer than necessary
I have a general idea how to calculate this but I'm not sure if there are any other drawbacks such as galling.
Unsure if there are calculations to predict galling against partial threads or if I'm missing other major drawbacks.

 

[IRstuff]

Seems to me that the normal screw is not intended for tapping, and will either simply not go any further, and/or damage the existing taper. This likely depends on the degree of taper.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

https://www.youtube.com/watch?v=BKorP55Aqvg

faq731-376 forum1529 Entire Forum list

http://www.eng-tips.com/forumlist.cfm

 

[Tmoose]

I rate the original post as D- for providing adequate up-front information.
--------------

Is the "cycle time" for machining the parts, or assembly?

Does "tapered threads" mean NPT pipe threads ? Or to the incomplete, shallow threads of necessity formed by a cutting tap beyond the "full depth threads " ?

Are these threads being formed/cut with a tap, or single point threaded with CNC etc ?

What is the material being tapped ?

How many holes, and how many parts ?

If these are blind holes, don't call it too close on the tap drill depth. SEVERAL threads deeper are required for chip clearance, tap point clearance etc.
I'm guessing RE-work for a few busted taps will eat up any savings in reduced machine time.
I'm guessing RE-work for a few broken, seized or bottomed out screws will eat up any savings in reduced assembly time.

If the X1 of full threads provides 1.5 diameters of thread engagement, buy a bunch of washers or shorter screws.
Depending on the (undefined) tapped material, and (undefined) thread size and pitch, thread forming screws may get you out of this bind.

https://www.kdfasteners.com/thread-forming-screws.html