Home |
Search |
Today's Posts |
#7
![]() |
|||
|
|||
![]() We are mixing multiple topics here... First, the OP asked about preventing mechanical seizure between two aluminum tubes... For this I prefer a molybdenum antiseize from the auto store, or similar... I had a System One beam in the air in Michigan for 25 years... The joints were lubed with the moly and then the assembled joint was taped with 3M - #33 tape and the ends of the tubes were plugged... When I sold the house and the beam came down the tape was still on, though starting to crumble, and the tubing only need a firm twist to slide the joints apart... The mating surfaces were clean and still had a shine.. There was an invisible film of the moly antiseize staining my hands and clothing after a quarter century... Second, is the issue of blocking electrolysis between disimilar metals, eg. copper and aluminum... For this I would use the appropriate paste, NoAlOx is one brand... For copper to copper there is a different paste used.. Third is the issue of slow oxidation of aluminum which causes a high resistance joint - and possible mechanical seizure... In areas more prone to oxidation then I might prefer NoAlOx, or similar over the moly based antiseize for bolts... In Arizona aoxidation is a non issue... In Tampa oxidation is the only issue... The last topic is increasing electrical resistance of the joint when the surface oxidizes... What the antioxidation paste has is zinc particles in suspension that when clamped between the two metal surfaces actually pierces the film of oxidation mechanically and creates a lower resistance path for current flow... denny / k8do |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Forum | |||
Part # 2 - The Simplest Shortwave Listener (SWL) Antennas That I Know Of . . . | Shortwave | |||
Passive Repeater | Antenna | |||
The Long and Thin Vertical Loop Antenna. [ The Non-Resonance Vertical with a Difference ] | Shortwave | |||
Grounding | Shortwave | |||
No CounterPoise - Portable Antenna System | Shortwave |