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donjohnston
Joined: 13 Dec 2009
Posts: 231
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 Posted: Fri Aug 09, 2013 10:11 am Post subject: Ground block (faston vs. ring) |
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I need a firewall passthrough ground block. I was thinking of using ring terminals because... it seemed like a good idea? 
But looking at B&C, Steinair, etc., it seems like everyone is selling faston connectors. Just wondering if there is an inherent reason for faston over ring.
And if I decide to go with ring terminals anyway, I was going to get a block of brass, drill and tap it so that I end up with the ring version of the faston style.
And what about dissimilar metal corrosion? Is it recommended to place something between the ground block and the metal side of the firewall?
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nuckolls.bob(at)aeroelect
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| Posted: Fri Aug 09, 2013 3:09 pm Post subject: Ground block (faston vs. ring) |
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At 01:11 PM 8/9/2013, you wrote:
| Quote: |
I need a firewall passthrough ground block. I was thinking of using
ring terminals because... it seemed like a good idea?
But looking at B&C, Steinair, etc., it seems like everyone is
selling faston connectors. Just wondering if there is an inherent
reason for faston over ring.
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See http://tinyurl.com/mk5k6j
| Quote: | And if I decide to go with ring terminals anyway, I was going to get
a block of brass, drill and tap it so that I end up with the ring
version of the faston style.
|
Don't tap holes for screws, use screws in clearance
holes with nuts to craft captive studs over which you
can run a locknut.
| Quote: | And what about dissimilar metal corrosion? Is it recommended to
place something between the ground block and the metal side of the firewall?
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This hasn't been done that I know off. B&C has been
selling the ground blocks for 10+ years and I'm aware
of no reported problems. Doesn't mean they don't
exist but I think it's low risk.
Bob . . .
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donjohnston
Joined: 13 Dec 2009
Posts: 231
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eschlanser
Joined: 08 Apr 2010
Posts: 60
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| Posted: Sat Aug 10, 2013 1:39 pm Post subject: Re: Ground block (faston vs. ring) |
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Don, Try this:
http://www.vansairforce.net/articles/CustomGroundBlock/GroundBlock.htm
After seeing it, I decided to craft my own using a K&S brass plate 12"x1"x0.064, from my hardware store, some 1258-ND tabs from Digikey, and a 5/16" x 1.5" bolt. The large brass bolt was the hardest to find (although I could have asked B&C to sell me one of theirs). I found brass washers and a bolt in short sizes from www.boltdepot.com. I saw they had a bronze bolt and decided to go with that for the extra strength to clamp down on the brass plate.
Actually, two brass plates, one on each side of the firewall, with 6 tabs on the front and more on the aft side.
Now I need to figure out how many tabs I will need. I'm not forced to use 24 or 48. And how to solder the tabs on.
Eric - building GRT HXr/430W/327 panel on a W-10/Lyc O320 with Z-13/8
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donjohnston
Joined: 13 Dec 2009
Posts: 231
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| Posted: Sat Aug 10, 2013 5:27 pm Post subject: Re: Ground block (faston vs. ring) |
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Nice. Looks like he used aluminum as the block. Since it's such a large piece, I guess it may be an acceptable substitute for brass or copper.
| Quote: | After seeing it, I decided to craft my own using a K&S brass plate 12"x1"x0.064, from my hardware store, some 1258-ND tabs from Digikey, and a 5/16" x 1.5" bolt. The large brass bolt was the hardest to find (although I could have asked B&C to sell me one of theirs). I found brass washers and a bolt in short sizes from www.boltdepot.com. I saw they had a bronze bolt and decided to go with that for the extra strength to clamp down on the brass plate.
Actually, two brass plates, one on each side of the firewall, with 6 tabs on the front and more on the aft side.
Now I need to figure out how many tabs I will need. I'm not forced to use 24 or 48. And how to solder the tabs on.
Eric - building GRT HXr/430W/327 panel on a W-10/Lyc O320 with Z-13/8 |
Sounds like what I'm looking to do.
Thanks!
Don
Velocity XL-RG, Vertical Power VPx-Pro, GRT HXr, remote avionics, Cont IO-550N.
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