Catastrophic Bolt Damage on my FNSPR

[ken jenkins]

Re: Catastrophic Bolt Damage on my FNSPR

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BigMahi</div><div class="ubbcode-body">....
Is there a generally presribed method to examine for cracks around the lug area? </div></div>

tho this discussion is getting getting old (and i'm on my droid fon) i will attempt to post a link.......

http://en.wikipedia.org/wiki/Dye_penetrant_inspection

if it doesn't work,just google "liquid dye penetrant".

Merry Christmas

 

[crockett007]

Re: Catastrophic Bolt Damage on my FNSPR

Dye Penetrant can only detect surface flaws. It works using capillary action. Mag Particle can sometimes detect near surface flaws. Ultra sonic or x ray are the only way to detect sub surface discontinuity or flaws in ferrous materials. Castings are particularly tough to test using NDT.

Cast round stock is heat treated, cut to length (diamond saw). Sample hardness (rockwell C) is performed after normalizing & before sawing to length, along with sample UT inspection to AWS D1.1 and D 14.3. On to the maching dept. ,then final dimensional. Final gage (100%)before finishing, and on to final assy.

Subsurface flaws are usually found in machining when the cutter breaks into a sand hole,or a void from some inclusion.

Bottom line is that subsurface discontinuities escape detection sometimes. It is inherent to the process, which, statistically is marginally capable.

No manufacturer on earth can guarantee every component 100% of the time.

 

[vossman]

Re: Catastrophic Bolt Damage on my FNSPR

Nice work on the letter, glad your OK and glad you got what you wanted. They certainly could have done it all better.

 

[Furtaker_.223]

Re: Catastrophic Bolt Damage on my FNSPR

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: COURAGEWOLF</div><div class="ubbcode-body">Glad you're ok man, thanks for posting this. Please share the outcome with FN. Especially if they give any kind of explanation as to the cause of failure.</div></div>

No shit! I too am glad no one got hurt.