Titanium, Aluminum Screws
Titanium, Aluminum Screws
(OP)
Anyone familiar with using Titanium screws or Aluminum screws in a military environment. Corrosion is not a big concern (should be in a sealed environement). They are not being used for major structural means -- just to fasten some electronics boards together w/ standoffs into an aluminum heatsink. I am scraping grams off my assy to meet wieght, and I am interested in halfing the wieght of my screws.
Loooking to have a buttonhead socket cap screw M3s.
Also any references for recommnended max torque, etc.?
Loooking to have a buttonhead socket cap screw M3s.
Also any references for recommnended max torque, etc.?





RE: Titanium, Aluminum Screws
Have you called your suppliers yet? The last time I checked price and delivery on titanium screws, it was $11 Canadian per screw and two weeks. I forgot what kind of screw it was, either phillips pan head, or hex socket head cap screw.
The selection of head and socket styles will be limited.
Your machine design textbook should tell you how to work out torque.
JHG
RE: Titanium, Aluminum Screws
Nick
I love materials science!
RE: Titanium, Aluminum Screws
NickE -- well, I was planning on actually using loctite to assure they don't back out during high vibe levles....not sure how that works w/ Ti screws yet....
RE: Titanium, Aluminum Screws
For manufacturers, try:
Alcoa
http://www
Textron
http://ww
SPS Technologies
http://www.spstech.com/aero/
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Titanium, Aluminum Screws
RE: Titanium, Aluminum Screws
RE: Titanium, Aluminum Screws
Worthy comment, Kenneth. When I run the torque calcs, I will certainly look at whether Aluminum will allow me to preload to the level I need to (it is a pretty high shock environment). These loads are lower compared to typical structural uses, but I'm not sure I'm willing to give up that much pre-load.
RE: Titanium, Aluminum Screws
Use tubular standoffs with a shoulder, and upset the part that extends through the board.
The cheapest, lightest screw is the one that isn't there.
Mike Halloran
Pembroke Pines, FL, USA
RE: Titanium, Aluminum Screws
RE: Titanium, Aluminum Screws
RE: Titanium, Aluminum Screws
Suppose you had a thin tube extending through all the boards. You could space the boards apart with slightly larger spacer tubes between the boards, and flare the ends of the central tube.
With some fairly serious tooling, you could space boards along a thinwalled tube by buckling its walls outward above
and below each board in turn. Sort of like the upset you see behind the panel for an installed rivnut.
OR, after positioning the stack and temporarily retain the boards in position, you could bulge the tube between the boards, e.g. with hydraulic pressure or an explosive cord. The boards would need to have substantial edge distance around the holes so the board would not split during the bulge process.
OR, you could carefully regulate the height and location of the components on each board, and just glue the tallest components to the bottom of the next board, with no standoffs at all.
Mike Halloran
Pembroke Pines, FL, USA
RE: Titanium, Aluminum Screws
(Easy to assemble/disassemble, convienient, and Ti/Al threaded rod and nuts might be cheaper.)
RE: Titanium, Aluminum Screws
= = = = = = = = = = = = = = = = = = = =
Corrosion, every where, all the time.
Manage it or it will manage you.
http://www.trent-tube.com/contact/Tech_Assist.cfm