Suitable material for replacing sand-cast 356-T6 fitting
Suitable material for replacing sand-cast 356-T6 fitting
(OP)
What would be the best material to machine a replacement from for a sand-cast 356-T6 attachment fitting for a flight control surface?





RE: Suitable material for replacing sand-cast 356-T6 fitting
Possible A356-T6 or 367-T6
check guide at:www.mid-atlanticcasting.com/alum-casting-alloys_FE...
RE: Suitable material for replacing sand-cast 356-T6 fitting
MMPDS-01 Table 3.9.4.0(b) provides allowables. Suggest 6061-T651 per AMS-QQ-A-250/11 or AMS-QQ-A-200/8 due to superior strength, near identical stiffness, excellent machining, corrosion, fatigue, cost, etc.
RE: Suitable material for replacing sand-cast 356-T6 fitting
Thanks for the responses.
RE: Suitable material for replacing sand-cast 356-T6 fitting
As noted by SAITAETGrad, 6061-T651 wrought aluminum would be a good choice as a direct material substitution for sand cast 356-T6. 6061-T651/AMS 4027 wrought material has better mechanical Ftu/Fty properties than sand cast 356.0-T6/AMS 4217 (42ksi/36ksi vs. 22ksi/15ksi), plus the wrought material would also have better fatigue properties. You could also take into account the large analysis knock-down factors typically applied to cast aircraft structures.
I've attached a historical version of FAR 25.621 from 1965 showing the casting factor requirements. The Connie design is much older than that, but it still gives a useful perspective.
Hope that helps.
Terry
RE: Suitable material for replacing sand-cast 356-T6 fitting
Where did you get a Constellation in flying condition?
Mike Halloran
Pembroke Pines, FL, USA
RE: Suitable material for replacing sand-cast 356-T6 fitting
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
RE: Suitable material for replacing sand-cast 356-T6 fitting
this is possibly the one - down here in oz we fly all the good oldies :)
http://hars.org.au/
RE: Suitable material for replacing sand-cast 356-T6 fitting
http://www.dlbs.de/en/Projects/Lockheed-Superstar/...
Imagine what this project costs!