[ARC5] Removing set screws

[Scott Johnson]

OK, at the risk of going overboard, I will share with you my secret for heating set screws.  I used to use a soldering iron, but I tend to be impatient, so it made a work coil for my induction heater that is a 1 ¼’ ID 3 turn coil of 12 AWG enameled copper I place it around the knob (plastic, bakelite, or even aluminum), and about 3 seconds is all it take to turn the setscrew red.  Let it cool a bit, and it comes right out.  You can buy cheap little switch mode induction heater kits on ebay for 15-20 bucks, they run well from a 24 VDC supply.  I have a more elaborate induction heater , but the cheap ones work FB.  

 

Scott V. Johnson W7SVJ

5111 E. Sharon Dr.

Scottsdale, AZ 85254-3636

H (602) 953-5779

C (480) 550-2358

 <mailto:scottjohnson1 at cox.net> scottjohnson1 at cox.net

 <mailto:scott.johnson at ieee.org> scott.johnson at ieee.org

 

From: arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> On Behalf Of Michael Hanz
Sent: Monday, November 18, 2019 7:59 PM
To: s at balrogs.org; Mike Feher <n4fs at eozinc.com>
Cc: arc5 at mailman.qth.net
Subject: Re: [ARC5] Removing set screws

 

It was a humorous rhetorical question, Scott.  :-)

On 11/18/2019 9:03 PM, Scott Robinson wrote:

I thought military radio >> metal knob.

 

Stuck plastic knobs are a royal PITA.

 

/scott robinson

 

 

On 11/18/19 4:46 PM, Mike Feher wrote:

Hah, hah, Mike. I never considered the composition of the knob on which I used the described procedure. There is no real heat setting on those small torches, other than noting the flame itself. Regardless, it has always worked for me on the knobs with which I had an issue otherwise. 73 – Mike 

 

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

848-245-9115

 

From: Michael Hanz  <mailto:aaf-radio-1 at aafradio.org> <aaf-radio-1 at aafradio.org> 
Sent: Monday, November 18, 2019 12:26 PM
To: Mike Feher  <mailto:n4fs at eozinc.com> <n4fs at eozinc.com>
Cc: arc5 at mailman.qth.net <mailto:arc5 at mailman.qth.net> 
Subject: Re: [ARC5] Removing set screws

 

Heh, heh...what heat setting do you use for thermoplastic knobs?:-)

- Mike  KC4TOS

On 11/18/2019 11:58 AM, Mike Feher wrote:

Hi Dave – 

I have found that heat always work. This is even if Loctite was used.  Once the appropriate wrench is found and doe not do the job by itself, apply heat. When I run into a tough one, I plece the wrench into the screw and secure the handle with long nose pliers. After that I apply heat from a small torch for a few seconds and out comes the screw. 73 – Mike 

 

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

848-245-9115

 

 





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-- 
Michael Hanz - KC4TOS
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