nuckolls.bob(at)aeroelect
Guest
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 Posted: Wed Apr 30, 2014 11:39 am Post subject: Battery and master contactor - ok to mount horizontally? |
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At 11:55 AM 4/30/2014, you wrote:
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<jamesmcburney002(at)gmail.com>
Hi, Jeff,
A word of caution for rivnuts: Be sure that you use rivnuts that
are HARDER than the substrate, in your case stainless
steel. Rivnuts have a bad habit of loosening in their holes, making
the bolt nigh onto impossible to unscrew. Don't ask me how I know!
This might be even worse if you use aluminum rivnuts, as there will
be corrosion between the metals, which will act as a lubricant.
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Good catch Jim . . . rivnuts are problematic
If he cannot get at the back side to install
a real 10-32 nutplate, I think I'd fabricate
a scab-on with nutplates to mount the
contactor. The scab plate needs to have sufficient
footprint so that pop-rivets used to fasten
it to the aircraft surface are not under
the contactor's mounting feet.
I would then cut clearance holes in the
aircraft surface for the nutplates and pop-
rivet the scab with a half dozen or so aluminum
rivets.
This is the sure-bet prophylactic against that
gut wrenching experience of having the rivnut
spin in the hole while trying to dismount the
contactor . . . just hate it when that happens!
Bob . . .
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