Original Posted By: "Doc Mosher"
Whew! Finally! A handful of meaningfull posts back to back. I wasbeginning to think the future was destined to be comprised of discussions ofwhite scarves, galvanized right angles, 14 guage wire, and "canned foamstuff".Thanks, Doc, for rescuing us!I would also like to interrupt this rivetting cascade of information and aska quasi-serious question. I have a handful of threaded fork ends. Iunderstand that cut threads are a no-no. But these have a piper part numberon them - so I dont know if they are the good ones or bad ones. Is a cutthread visibly discernible from a rolled thread? I hate to throw out abunch of fork ends that may be useable (and safe). How about it Mike Cuy?Didn't you use fork ends on your lift struts. Gene Rambo - I bet you knowthis. Don Hicks - what do you think?Oh yeah Dont forget Sun N Fun coming up. Volunteers are needed. E-mailme off-line if you're interested.Later Fellas....Bert----- Original Message -----
Re: Pietenpol-List: Elevator cable slack- Thanks DOC!
Re: Pietenpol-List: Elevator cable slack- Thanks DOC!
Original Posted By: Bert Conoly
----- Original Message -----
----- Original Message -----
RE: Pietenpol-List: Elevator cable slack- Thanks DOC!
Original Posted By: "Jack Phillips"
I would also like to interrupt this rivetting cascade of information and aska quasi-serious question. I have a handful of threaded fork ends. Iunderstand that cut threads are a no-no. But these have a piper part numberon them - so I dont know if they are the good ones or bad ones. Is a cutthread visibly discernible from a rolled thread? I hate to throw out abunch of fork ends that may be useable (and safe). How about it Mike Cuy?Didn't you use fork ends on your lift struts. Gene Rambo - I bet you knowthis. Don Hicks - what do you think?BertBert, there is nothing wrong with cut threads (all your AN hardware has cutthreads), it's just that rolled threads are stronger, particularly inregards to fatigue strength. If you are really concerned, take them to ashop that has a magnaflux machine and have them inspected for cracks, or buya dye pentrant inspection kit (Wick's and Aircraft Spruce both sell thesekits) and inspect them yourself.You can tell rolled threads from cut threads very easily - cut threads willalways have the major diameter of the threads to be no larger than the shankdiameter of the rod (the diameter before the threads were cut). Rolledthreads have the major diameter of the thread larger than the shankdiameter, because the metal is upset and "squished" out to form the threads.This is what makes them stronger, they are sort of "cold-forged" into themetal, with smooth thread roots (the valley between the threads) whereas cutthreads tend to have sharp valleys, which tend to concentrate the stressesat the valleys, leading to fatigue failures.As Mike Brusilow said, if they have "Piper" stamped on them, they areprobably fine, unless they look very rusty or obviously worn.Good Luck,Jack Phillips________________________________________________________________________________
I would also like to interrupt this rivetting cascade of information and aska quasi-serious question. I have a handful of threaded fork ends. Iunderstand that cut threads are a no-no. But these have a piper part numberon them - so I dont know if they are the good ones or bad ones. Is a cutthread visibly discernible from a rolled thread? I hate to throw out abunch of fork ends that may be useable (and safe). How about it Mike Cuy?Didn't you use fork ends on your lift struts. Gene Rambo - I bet you knowthis. Don Hicks - what do you think?BertBert, there is nothing wrong with cut threads (all your AN hardware has cutthreads), it's just that rolled threads are stronger, particularly inregards to fatigue strength. If you are really concerned, take them to ashop that has a magnaflux machine and have them inspected for cracks, or buya dye pentrant inspection kit (Wick's and Aircraft Spruce both sell thesekits) and inspect them yourself.You can tell rolled threads from cut threads very easily - cut threads willalways have the major diameter of the threads to be no larger than the shankdiameter of the rod (the diameter before the threads were cut). Rolledthreads have the major diameter of the thread larger than the shankdiameter, because the metal is upset and "squished" out to form the threads.This is what makes them stronger, they are sort of "cold-forged" into themetal, with smooth thread roots (the valley between the threads) whereas cutthreads tend to have sharp valleys, which tend to concentrate the stressesat the valleys, leading to fatigue failures.As Mike Brusilow said, if they have "Piper" stamped on them, they areprobably fine, unless they look very rusty or obviously worn.Good Luck,Jack Phillips________________________________________________________________________________
Re: Pietenpol-List: Elevator cable slack- Thanks DOC!
Original Posted By: clif
Subject: Re: Pietenpol-List: Elevator cable slack- Thanks DOC!In a message dated 02/13/2002 9:36:21 PM Central Standard Time, bconoly(at)home.com writes:>Bert...Have always avoided using cut threads on any critical applications but have to admit I have never seen any testing info comparing the two. Just don't want to play the guinnea pig. I wouldn't throw the cut ones out until you have seen some expert analysis. I have held my tongue regarding the recent garbage out of respect for the List Guidlines and the need to avoid personal comments but am happy to see that those with a great deal more diplomacy than I have addressed the issue. Thank goodness for level heads. Don Hicks________________________________________________________________________________Date: Thu, 14 Feb 2002 23:06:33 -0800
Subject: Re: Pietenpol-List: Elevator cable slack- Thanks DOC!In a message dated 02/13/2002 9:36:21 PM Central Standard Time, bconoly(at)home.com writes:>Bert...Have always avoided using cut threads on any critical applications but have to admit I have never seen any testing info comparing the two. Just don't want to play the guinnea pig. I wouldn't throw the cut ones out until you have seen some expert analysis. I have held my tongue regarding the recent garbage out of respect for the List Guidlines and the need to avoid personal comments but am happy to see that those with a great deal more diplomacy than I have addressed the issue. Thank goodness for level heads. Don Hicks________________________________________________________________________________Date: Thu, 14 Feb 2002 23:06:33 -0800