lay symbol callout on a bore

[Brianfore]

thread1103-361438
Looking for opinions or any feedback on the attached pdf. The symbol in question is the 32 finish call out with additional symbols. Would this be the correct way to control rifling in the bore as the customer is concerned about a linear path through the bore that could potentially be cause for failure in the part. Any feedback or suggestions would be appreciated.

Thank you for looking

 

[MikeHalloran]

I think a text note could be clearer than any symbology for specifying the surface lay within a bore.

Tangentially, absent some functional requirement (like seating a bolt on its thread tip instead of the undimensioned shoulder), +/-.005 for thread depth is insane.

Not so tangentially, reamers normally have a lead-in chamfer at their tip, but your drawing suggests a square bottom to the 32 finish, which suggests a modified reamer with a squared tip, which will probably leave a helical scratch all the way down the bore.

Maybe you need a balloon at the bore/thread intersection, and an expanded view showing the very fine details you really want at the bore/thread intersection.



Mike Halloran
Pembroke Pines, FL, USA

 

[CheckerHater]

The symbol represents "perpendicular orientation relative to the surface in the view displaying the surface texture symbol", which, to the best of my understanding, means lay oriented across the bore, rather than "rifling".

"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future

 

[Brianfore]

Thank you, the symbol caused a bit of confusion when it hit the shop floor and later in inspection so we are trying to find some common ground with the customer.

 

[dgallup]

Absolutely means that lay is going around the bore, perpendicular to the line in the view it is applied to. I use that all the time when I need an o-ring seal in a bore. An axial scratch may create a leak path.

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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.

 

[powerhound]

What dgallup said.

The tool marks should be perpendicular to the axis of the hole. The all around symbol is not necessary.

John Acosta, GDTP Senior Level
Manufacturing Engineering Tech