[Milsurplus] Penetrating oil test - Youtube

Mon Apr 24 14:29:19 EDT 2023

Assuming that you are the first to try to remove the setscrew and the Bristol or Allen head is still tight fitting to the wrench, I have found that just applying some torque and holding that torque steady for a few minutes does the trick, way more then half of the time.  You can always increase the torque a bit and hold it for a longer time so as not to strip the screw head.  Patients is key to the process.  Even more patience is required if you have to drill out the screw once the head is stripped.  Been there, done that with home made drill bit extensions so as not to mar the front panel.
It seems that way too much torque is used to install the setscrew and it is essentially welded in place.  This is especially common in my experience with the Oldham coupler clamps used on the Collins KWT-6 after years of adjustments by those in a hurry.
Mike and others who are fans of Hitchhikers42 in binary is 101010 and was seen scratched on the caveman's wall, IIRC!  <grin>
 Regards,Jim
Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy-----Original Message-----
From: Michael Hanz <aaf-radio-1 at aafradio.org>
To: milsurplus at mailman.qth.net <milsurplus at mailman.qth.net>; ARC-5 List <Arc5 at mailman.qth.net>
Sent: Mon, Apr 24, 2023 8:30 am
Subject: Re: [Milsurplus] Penetrating oil test - Youtube

 That's an excellent question, Wayne.  For years, I've followed these kinds of tests closely for obvious reasons, and a lot of them are subjective, with little in the way of scientifically designed boundary conditions.  I have them back to over ten years ago, and probably further, mostly in the vehicle maintenance and home shop machining communities for obvious reasons.  Everyone swears by this solution or that, but the sample set that any one of us radio guys personally has is painfully low - how many of us do it on a regular basis with dozens of samples?  And the real problem is that the size of the test threads in these tests is almost always significantly larger than the relatively small screws (like knob setscrews) that we have to address most frequently.  Life ain't always linear.  

 There is a later method that I've found useful, but it too involves some limitations based on surrounding knobs/handles/etc., and that's an induction heater.  The most difficult setscrews I have ever encountered are on the glued-in screws in BC-191/375 transmitter dials, and 10-15 seconds of heating works wonders without harming the black bakelite knobs or paint at all.  If you can fit the coil around the knob, it has always provided the cure - at least for me.  This has been verified by the home shop machinist and vehicle communities as well, but the difficulty is always the geometry of the frozen screw/bolt with respect to surrounding structures.  The professional models are a bit pricey and require a bevy of different coil shapes and sizes in an attempt to cover the most situations.  I picked up one for a few bucks on Amazon (search "low voltage induction heaters", if interested)  but the quality of these Chinese products runs all over the place, and you do need to wind more than one coil set for different size radio knobs.  The good news is that these cheap drivers generally work on 12-14vdc or 24-28vdc, voltages which may sound familiar to most of you.

 As a result of its limitations, I would never call this solution the answer to the "Ultimate Question of Life, the Universe, and Everything".  That allegedly remains "42" according to The Hitchhikers Guide to the Galaxy.  YMMV.  😁

 Just another data point for consideration...as if we needed more.

      73,
  - Mike  KC4TOS

 On 4/24/2023 12:26 AM, hwhall at compuserve.com wrote:

What should we make of a chart that shows some products sometimes make the required torque higher than if we used nothing at all??

 Wayne WB4OGM 
 -----Original Message-----
 From: Hubert Miller <Kargo_cult at msn.com>
 To: milsurplus at mailman.qth.net <milsurplus at mailman.qth.net>; nwvrs at googlegroups. com <nwvrs at googlegroups.com>
 Sent: Sun, Apr 23, 2023 9:19 pm

 I have been puzzling, and kind of dreading, how best to approach frozen setscrews in an old
  radio. As if that isn't enough of a challenge, the frozen setscrews ( grub screws ) are in positions
  difficult to reach with any tool. What fun that will be. So this little video was of some interest.
  -Hue Miller 
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