I found this site:
https://engineerdog.com/2015/01/11/10-tricks-engineers-need-to-know-about-fasteners/
They suggest that studies show lockwashers are ineffective, but then go on
to reference other studies that show they are.
I guess is all comes down to that common answer in engineering: "It
I have had this issue with my KX2 paddle and have two observations:
On my paddle, the screw that is meant to hold the standoff to the plastic
body will actually screw tightly into the plastic body *without* the
standoff. When this happens, additional torque applied with a screwdriver
has no
It's useful to remember that a screw (or bolt) is a spring. When tightened
it stretches lengthwise. Like any spring, it offers the best "grip" when
subjected to the right range of pressure.
Way back in my High School days (1950's - before Mercury was a toxic
substance) I watched a demonstration
As I learned from my previous manufacturing experience and knowledge, a
threaded fastener, a.k.a. screw, has a specific torque value which
should be applied to make it secure. The value depends on the screw
design, flat head, binder head, round head, undercut, pan head, etc.
The only way
Hi Tom,
First let me say that I am not trying to argue with you or correct you. I
just want to share what little bit of knowledge I have.
In my many years as a master mechanic in the heavy duty truck industry, I
can tell you without reservation that unless you use physical force
(screwdriver,
The point should be that a "drop of LocTite" isn't going to fix the
problem over time.
You should not have to modify a product immediately out of the box
because of a lousy
design.
Best regards,
Tom, W1TEF
Lexington, SC
On 7/24/2017 6:22 PM, John Oppenheimer wrote:
This is the response I
This is the response I received from Elecraft support:
On 06/27/2017 01:34 PM, Elecraft Support wrote:
> To your question, yes, we are now using a drop of Locktite Blue (not
> Red) on the threads for the 2 screws that hold the round contacts in
> place.
John KN5L
On 07/24/2017 10:45 AM, KENT
raft; w4sc
Subject: Re: [Elecraft] [KX3] Re: Kx2 paddle issue
Loctite 425 appears to be the only one they recommend for metal to plastic.
It is Cyanoacrylate based. It may not be that much different from the plain
old CA glue you used, except it is a pretty Loctite blue!
http://www.na.henkel-adh
ly removed when needed.
73, Ron AC7AC
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Josh Fiden
Sent: Monday, July 24, 2017 1:20 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] [KX3] Re: Kx2 paddle issue
There are
an.qth.net
> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Mark Goldberg
> Sent: Monday, July 24, 2017 11:09 AM
> To: w4sc
> Cc: Elecraft
> Subject: Re: [Elecraft] [KX3] Re: Kx2 paddle issue
>
> There are many different Loctites of each color. Exactly what has worked
Kent and Wayne,
I have not had any success with Loc-Tite. This is strictly an
engineering issue - the screws are too short
to produce enough torque to hold the contact posts in place - its as
simple as that. Longer screws help,
but again, the length of the contact posts and small diameter of
There are something like 40 different formulations of Loctite
Threadlocker. It's a great product *if* you select the correct one for
your application. The wrong one can be a disaster.
73,
Josh W6XU
On 7/24/2017 12:48 PM, Ron D'Eau Claire wrote:
Perhaps Loctite has changed the formula
on
the end of the screw where it exits are all that is needed.
73, Ron AC7AC
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Mark Goldberg
Sent: Monday, July 24, 2017 11:09 AM
To: w4sc
Cc: Elecraft
Subject: Re: [Elecraft] [KX
There are many different Loctites of each color. Exactly what has worked
for you? I have settled on Blue Loctite 243 for it's improved temperature
range, better compatibility with Stainless Steel hardware and oil
resistance.
73,
Mark
W7MLG
On Mon, Jul 24, 2017 at 10:05 AM, w4sc
You may want to reconsider using Loctite Red (or Blue), the highest strengths.
If you ever want to disassemble that part of the XDP2, it may take heat and
excessive force to loosen.
Loctite Purple is probably more than adequate for the securing of the posts. A
tiny dab of Purple on the end
The issue is not that the paddles don't leave the factory fully tested
and operational, but that the stand-offs (E700348) loosen after a period
of time from normal use.
As posted by several of us previously, the fix is simply to place a
small dab of Loctite Blue on the threads of the two
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