General profile governing limits 1

[decS]

I have a quandary that appears quite often on prints I work with.

A given part has a general profile to govern undimensioned features. On said part I have a blind, threaded hole called out on the print to Y14.6 standards. There is a section view of this hole with a cylinder depth called out However a drill tip is modeled with the part. This drill tip is not specifically defined on the print. Does the general profile apply to the cone formed by the modeled drill tip?

I would like to argue that it does not apply as the drill tip geometry would then require that a drill be used to form the hole rather than some other machining process. Especially when this drill tip is likely automatically modeled by a hole wizard in the designer’s CAD program.
A further slippery slope, do I need my CMM to construct a cone for the drill tip to ensure that the profile is met at the base of the hole?

 

[mfgenggear]

again over tolersncing and over thinking it.
a note with an arrow dim stating standard drill point. and dimension the length of the diameter. the drill diameter is the minor diameter of the thread. that's all is needed.
depending on the type of drill the included angle changes. but who cares its a drill point.
Ps added comment , flat optional or bottom
Flat surface. It can be milled with end mill
With a flat bottom.

 

[greenimi]

again over tolersncing and over thinking it.
a note with an arrow dim stating standard drill point. and dimension the length of the diameter. the drill diameter is the minor diameter of the thread. that's all is needed.
depending on the type of drill the included angle changes. but who cares its a drill point.
Ps added comment , flat optional or bottom
Flat surface. It can be milled with end mill
With a flat bottom.

Everyting is "overtolerancing and overthinking" UNTIL you have to pay for the SCRAP you just created with your ignorance and lack of proper specification.

 

[Doug Hunter]

Everyting is "overtolerancing and overthinking" UNTIL you have to pay for the SCRAP you just created with your ignorance and lack of proper specification.

As the old adage says: "An ounce of prevention is worth a pound of cure."

 

[mfgenggear]

So tell me so what does a drill point scrap a part.
This causing un necessary inspection , and questions as the op has stated.
A properly designed part or assembly
Has to be manufacturable yet meet the design
Criteria for fit form and function.
Un necessary tight tolerancing causes higher cost in manufacturing and inspection which equals to
$$$$$. Engineers must walk a tight line.

 

[mfgenggear]

Scrap is caused by engineers don't under stand manufacturing requirements. Heat treating
Simple as this tighter tolerance cost more.
I have been doing this for a while.
Number one issue that gets designers in trouble is assuming and or guessing.