Not if crimped properly... I used to work at an automotive cable company and we crimped fittings on strand and conduit all the time... If crimped properly you could get 150 - 250 lb pull off strength on some crimps...
Stop in for a cup of coffee
- Thread starter toolmanmike
- Start date
-
Not if crimped properly... I used to work at an automotive cable company and we crimped fittings on strand and conduit all the time... If crimped properly you could get 150 - 250 lb pull off strength on some crimps...
man - Karl must be sleepin'..
Yeah, I took a nap, I'm catching the kid's cold right now....
ScampMike
Despicable Damn Yankee
I can see for miles and miles and miles....Yeah, I took a nap, I'm catching the kid's cold right now....
Just stopped by. Wouldn't the rod spin inside of the crimp because of the torsional twist?
ScampMike
Despicable Damn Yankee
that's kinda what I was thinking - even if it held at first - eventually it would give
No a good hexagonal crimp will hold pretty tight if he has enough wall thickness on the sleeve and a good crimp...
General rule of thumb is 75% - 85% of original diameter for crimp....
Use a good inertia or hydraulic crimp press...
ScampMike
Despicable Damn Yankee
might work if you were to crimp the sleeve onto the rod and then spot weld it in two spots on either end...
Or the roll pin trick. You might be able to grind flats on both sides of each rod for the crimp to bite to.
Have you tried to pull an end fitting of a trans cable conduit??? It won't spin or pull if crimped properly... Try it...
ScampMike
Despicable Damn Yankee
oh - I get it - I'm just thinking that there is quite a bit of torsion on those rods and given enough time (YEARS) that it would eventually fail.. ???
You are all over-thinking this, use a good crimp...
30 - 50 ton press, thick wall on the sleeve, and crimp to 75% - 85% of sleeve od to across flats of hex...
I did the pull testing and design verification testing for developing the transmission cables for Saturn and the Chrysler JA Cirrus/Stratus...
We cycled the Saturn cables with 160 lb of force on them for over 100,000 cycles on our test fixture.... Including some of that testing at - 20° F for part of those cycles...
A good crimp will hold...
30 - 50 ton press, thick wall on the sleeve, and crimp to 75% - 85% of sleeve od to across flats of hex...
I did the pull testing and design verification testing for developing the transmission cables for Saturn and the Chrysler JA Cirrus/Stratus...
We cycled the Saturn cables with 160 lb of force on them for over 100,000 cycles on our test fixture.... Including some of that testing at - 20° F for part of those cycles...
A good crimp will hold...
ScampMike
Despicable Damn Yankee
maybe - but those trunk torsion rods are already fairly thin.. I would be concerned that you would compromise the strength where you grind it
ScampMike
Despicable Damn Yankee
well - where the heck were ya while poor Tim was kicking this puppy around!! - - - oh yea, SLEEPING...
ScampMike
Despicable Damn Yankee
so it seems his 40 ton press will do the trick - - hey Tim @Mopar Tim -- read above!
A good crimp will not move... It will take many years for it to fail if done properly...
It should last longer than most of us will live... (Then it's someone else's problem after we die...)
It's important to get enough wall thickness in the sleeve...
well - where the heck were ya while poor Tim was kicking this puppy around!! - - - oh yea, SLEEPING...
I'm so good, I can do this in my sleep.... (I'm still sleeping - sleep typing, like sleep walking....)
ScampMike
Despicable Damn Yankee
just to throw some fodder on it - any chance the crimping itself will be too much for the rod? maybe crack/split it and cause premature failure?
It should be ok if you don't OVER crimp it...
ScampMike
Despicable Damn Yankee
so the question begs - what is the tensile strength of that particular steel... and will it hold up to a 40 ton press..?
ScampMike
Despicable Damn Yankee
isn't spring steel, in it's own way, actually more brittle and susceptible to side impacts?
-
