I don't necessarily know what I'm talking about in the aviation area, but I
do home-shop machining as a hobby and have faced things like this before.
When I have a hole that has buggered or pulled-out threads, I drill it out
to a larger size, tap it and install a bolt or a piece of threaded rod
usi
On 10/29/2020 3:49 PM, Sid Wood via KRnet wrote:
I made a circular aluminum ring with the same pattern required for
each sender plate. Installed five each 10-32 captive nut plates with
flush rivets to match the sender pattern. Cut the ring with one saw
cut and de-burred that. The cut allows
Larry,
The sender units on my KR-2 wing tanks have a circular bolt pattern, but the
5 screws are offset slightly so that there is only one orientation for the
sender. Floats are fussy about that.
I made a circular aluminum ring with the same pattern required for each
sender plate. Installed f
On 10/28/2020 10:08 PM, Jeff Scott via KRnet wrote:
Space your bolt length and washers just right, and maybe you won't need to
break it off.
+++
Thanks, Jeff. That should be easy to determine. If the Helicoil holds
The tang is driven in first with the installation tool and would be on the
inside. Space your bolt length and washers just right, and maybe you won't
need to break it off. Try it on a test piece first so you know how deep you can
go and whether breaking it off can be done.
-Jeff
>
> On 10/28
The tang on the helicoil is used to insert it using the special tool with the
notch in the kit.
John
> On Oct 28, 2020, at 5:01 PM, Flesner via KRnet wrote:
>
> On 10/28/2020 4:21 PM, Mark Langford via KRnet wrote:
>>
>> I would simply go with the Heli-Coils.
>
> +++
On 10/28/2020 4:21 PM, Mark Langford via KRnet wrote:
I would simply go with the Heli-Coils.
++
Thanks. Here goes my next 6 gallon of 100LL.
Larry Flesner
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On 10/28/2020 4:41 PM, Jeff Scott via KRnet wrote:
The question is whether you can break off the tang on a helicoil in such a
shallow hole without damaging the helicoil itself
lf I size the bolt right do I need to break the tang? Seems like the
he
>
> 2. Question. would the Helicoil be as effective as the Keenserts in this
> application? What thread size is the outside of the 3/16 insert and
> would there be enough threads in the hole to hold? Can I drill the
> threads out of present holes and have enough material to thread a 3/16"
Larry wrote:
> So, that fix is out. I want to proceed through my other possible fixes
> in a manner as to not eliminate the easiest and cheapest fixes as I move
> to more aggressive solutions without taking a saws-all to my fuel
tank...
I would simply go with the Heli-Coils. They work OK,
Update on fuel leak fix. I did a test today on the Poly-Nuts and they
are not up to the task. Placed a scrap piece of aluminum in the vise
and drilled three holes. Installed Poly-Nuts with puller, then snugged
them down a bit more with wrench. They might tighten up enough to seal
but I i
Larry Flesner wrote:
> I wondered when you would chime in on this. Will Keenserts install
> easily and hold in 1/8" inch aluminum? Using John Shaffer's method to
> set I can avoid using the hammer. Suggested supplier?
Minimum thickness material is 1/16". I don't know how "easy" that is,
but
On 10/28/2020 8:09 AM, Mark Langford via KRnet wrote:
In the end they were are all replaced with Keenserts,
+++
Mark,
I wondered when you would chime in on this. Will Keenserts install
easily and hold in 1/8" inch aluminum? Using John Shaffer's m
At the aerospace engineering/fabrication business where I spent the last
31 years working, one of our junior engineers designed a piece of
military hardware with thousands of rivnuts retaining the outer shell to
the aluminum frame. Us old-timers had known for decades that Keenserts
were the on
Larry , I have never " tapped them in ". I put a nut on a longer
screw, followed by a steel washer. Then screw the bolt in to the
Keensert, thread it into the newly threaded hole, then while holding
the bolt from turning, run the nut and washer down to the tanks'
aluminum plate. The Keensert will
On 10/27/2020 6:17 PM, shafferj455js--- via KRnet wrote:
Larry , Check out a Keensert.
++
John,
Keensert looks like an improved helicoil. I'm not sure they will work
all that well in 1/8" aluminum. The video shows one being installed in
t: Monday October 26 2020 8:52:24PM
Subject: Re: KR> Riv-nuts / poly-nuts
On 10/26/2020 7:34 PM, Jeff Scott via KRnet wrote:
> You'll only get a couple of threads in it, but that's all you had
before.
What are my other options besides helicoil an
On 10/27/2020 3:48 PM, Phillip Matheson via KRnet wrote:
far to rotate and drill.
Or just cut an access whole (6”) in the bottom of the tank to get inside to
work, then reseal , or make it removable like metal aircraft tanks
Phil.
+
On 10/27/2020 3:23 PM, Pete Klapp via KRnet wrote:
Larry
How about going to a slightly larger metric size and retapping that hole.
That was one of the first things that crossed my mind but I never
checked in to it. Anything
Larry. Most likely the best so far to rotate and drill.
Or just cut an access whole (6”) in the bottom of the tank to get inside to
work, then reseal , or make it removable like metal aircraft tanks
Phil.
Sent from my iPhone
> On 28 Oct 2020, at 00:40, Flesner via KRnet wrote:
>
> On 10/27/
KRnet
Sent: Tuesday, October 27, 2020 9:40 AM
To: Flesner via KRnet
Cc: Flesner
Subject: Re: KR> Riv-nuts / poly-nuts
On 10/27/2020 8:05 AM, Flesner via KRnet wrote:
> I have zero access to the inside. That's my dilemma.
+++
I&
Would a dab of jb weld reduce the issue?
On Mon, Oct 26, 2020, 8:09 PM Jeff Scott via KRnet
wrote:
> FWIW, I detest those darned rivnuts. krnet.org
>
>
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Please see LI
On 10/27/2020 8:05 AM, Flesner via KRnet wrote:
I have zero access to the inside. That's my dilemma.
+++
I'm surprised that no one has suggested just rotating the sender and
drilling and tapping new holes. I'm holding that one in reser
On 10/26/2020 9:04 PM, Phillip Matheson via KRnet wrote:
Then use fuel proof resin on the inside over the Anchor nut area to seal.
+++
I have zero access to the inside. That's my dilemma. Filler cap is 7
feet out on the wing
Hi
What does it take to be taken off the BLOG I have tried several times still
waiting
-Original Message-
From: KRnet On Behalf Of Phillip Matheson via
KRnet
Sent: Tuesday, 27 October, 2020 12:05 PM
To: KRnet
Cc: Phillip Matheson
Subject: Re: KR> Riv-nuts / poly-nuts
Just a thou
On 10/26/2020 8:34 PM, Jeff Scott via KRnet wrote:
You could also replace the mounting plate.
As that would require cutting it out of the fiberglass tank I may save
that option till after I have a problem with #1 and #2.
Larry Flesner
_
Ok so let me see if I can explain the fix I would use. I'll call them C plates
for lack of a better name. Make a round plate that is 1/4 inch larger and 1/4
smaller than the radius. Mark and drill matching holes and tap them for your
screws. Cut the plate in half and insert each in the tan
Just a thought. Drill for a ankle nut. Rivet in place.
Fill the whole, thread, top of anchor nut with urethane foam?? Or similar.
Then use fuel proof resin on the inside over the Anchor nut area to seal. Then
the bolt with screw through the foam. Should work ok. This was a thought of
mine if m
onday, October 26, 2020 at 7:53 PM
> From: "Flesner via KRnet"
> To: krnet@list.krnet.org
> Cc: "Flesner"
> Subject: Re: KR> Riv-nuts / poly-nuts
>
> On 10/26/2020 7:34 PM, Jeff Scott via KRnet wrote:
> > You'll only get a couple of threads in i
On 10/26/2020 7:34 PM, Jeff Scott via KRnet wrote:
You'll only get a couple of threads in it, but that's all you had before.
What are my other options besides helicoil and rivnut / poly-nut?
Larry Flesner
___
Search the KRnet Archives at https://ww
at 7:20 PM
> From: "Flesner via KRnet"
> To: krnet@list.krnet.org
> Cc: "Flesner"
> Subject: Re: KR> Riv-nuts / poly-nuts
>
> On 10/26/2020 7:09 PM, Jeff Scott via KRnet wrote:
> > I would rather attempt to helicoil the thin al
On 10/26/2020 7:09 PM, Jeff Scott via KRnet wrote:
I would rather attempt to helicoil the thin aluminum plate than create a
future problem by use of a rivnut.
+++
Is it possible to helicoil a 1/8
:14 PM
> From: "Flesner via KRnet"
> To: krnet@list.krnet.org
> Cc: "Flesner"
> Subject: Re: KR> Riv-nuts / poly-nuts
>
>
> Here is the puller I purchased. Looks like I got a deal at Menards. It
> is double that price from other suppliers.
>
Here is the puller I purchased. Looks like I got a deal at Menards. It
is double that price from other suppliers.
https://www.menards.com/main/tools/hand-tools/staplers-staples-rivet-tools/surebonder-reg-threaded-insert-tool/8510/p-130629190-c-9164.htm?tid=-1&ipos=1
Larry Flesner
On 10/26/2020 5:28 PM, Flesner via KRnet wrote:
Here is one supplier with lots of good info.
http://www.duncanbolt.com/suppliers/marson/additional-products/klik-poly-nuts
+
The "cross section view" o
Update on my fuel leak fix. My fuel sender gasket started leaking after
15 years so I ordered new gaskets. I'm assuming that was the source of
the leak as all fittings looked dry. I removed the probe (7 feet long)
and installed the new gasket. In tightening down the five bolts one did
not
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