| Author |
Message |
Ron R. (64.12.96.235)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, July 15, 2002 - 8:41 pm: | |
I am having steel pins made for the upper A arms for my o-1 eagle. These pin's slip inside rubber bushings. The steel fabricator ask me if they needed to be real hard steel. Any comments from the "Great Ones" would be appreciated.
Thanks,
Ron |
Jayjay (65.142.15.14)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, July 15, 2002 - 9:13 pm: | |
Ron, even though they are inside rubber bushings, they still take a terible beating, and if the rubber fails, your life may depend on the extra bit of hardness in a well made 4130 or 4140 pin. Care must be exercised to not use a grade that is too hard, or "brittle". Personally I would opt for the 4140, but without any sort of heat-treating or surface hardening. Be sure they are "smooth", with no nicks or gouges in them, since these "stress-risers" are particularly bad on a piece that has almost all of it's load in "shear". Cheers...JJ |
Ross Carlisle (Ross) (216.107.195.188)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, July 15, 2002 - 10:01 pm: | |
I would find out what alloy the originals were made from and use the same. Suspension parts are not exactly the best parts to "re-engineer".
Ross |
Bradd B. Smith (Bbsrtbusproject) (208.26.165.28)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, July 16, 2002 - 12:34 am: | |
Ross is right. Most of the pins I have encountered in my 20 year machinist history, in this application, have been case hardened mild steel. Wear surface is good and not brittle because of the ms core. However, I would do my homework and make sure. Unless your fabricator is very well equiped, case hardening will be beyond their capacity. 4140 is an excellent, high carbon steel, but in a non-heat treated state offers very little wear improvement. It's shear strength is good. Again, I would find out what the original pin's were made from, and try and find a Cat or other truck crossover application. |
chris (66.76.182.147)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, July 16, 2002 - 8:02 pm: | |
i would suggest using EDT150 which is basically 4i40 material which has been quinched & heat treated. It has excellent wear properties and is not brittle most machine shops keep this.
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