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 Post subject: Where to get a set screw for a Heathkit knob
PostPosted: Mar Fri 09, 2018 3:26 am 
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Location: Spring Hill, FL
I've got a Heathkit SG-8, and I had to replace one of the pots. But the set screw on the knob was rusted, and while it did come out, the slot for the screwdriver broke apart in the process.

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 Post subject: Re: Where to get a set screw for a Heathkit knob
PostPosted: Mar Fri 09, 2018 3:44 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Albuquerque, NM 87123
Those set screws often strip out the plastic, so I usually just replace them with a 10-32. Of course you have to tap the new threads.


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 Post subject: Re: Where to get a set screw for a Heathkit knob
PostPosted: Mar Fri 09, 2018 3:45 am 
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Location: Portland, TN, USA
I found quite a selection at my local Ace Hdw and was able to find what I needed for my SX-42 when one of the Knobs had a set screw that was messed up.

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 Post subject: Re: Where to get a set screw for a Heathkit knob
PostPosted: Mar Fri 09, 2018 7:21 am 
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Joined: Jun Sat 09, 2007 8:14 am
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Location: Florida
All you need to make a setscrew is a regular screw, a hacksaw and a file. Cut the screw to length and make a slot. Dress it with the file. Done.

RRM


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 Post subject: Re: Where to get a set screw for a Heathkit knob
PostPosted: Mar Fri 09, 2018 8:48 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 17929
Location: Albuquerque, NM 87123
Retired Radio Man wrote:
All you need to make a setscrew is a regular screw, a hacksaw and a file. Cut the screw to length and make a slot. Dress it with the file. Done.

RRM


Except for one problem: set screws are made of hardened steel for a reason. They need to cut into the metal shaft of a control or switch. Using a screw of the same hardness doesn't work well.

Besides, you can get a hundred set screws for $10 to $15. An awful lot easier than using a hacksaw.


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 Post subject: Re: Where to get a set screw for a Heathkit knob
PostPosted: Mar Fri 09, 2018 11:56 am 
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Joined: Sep Tue 30, 2014 6:08 am
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Location: The Old Dominion VA 23518
Most set screws are plain steel or stainless. Ace Hardware has the stainless ones starting at 1/8" length - larger knobs will use 3/16" length, most likely. Originals are likely 6-32 if using two set screws, or 8-32 for larger (1" diameter or more) knobs. Single set screw knobs - anybody's bet as to what size threads.

I just went through a bunch of Davies, Rogan and Raytheon knobs and the setscrew dilemma - new but either corroded set screw (from knob plastic outgassing) or missing (sealed bag, no set screw in the knob or bag.) Ace had all I needed - 11 stainless set screws set me back $5.38....

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 Post subject: Re: Where to get a set screw for a Heathkit knob
PostPosted: Mar Fri 09, 2018 2:51 pm 
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Joined: Jun Sat 09, 2007 8:14 am
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Location: Florida
Johnnysan wrote:
Retired Radio Man wrote:
All you need to make a setscrew is a regular screw, a hacksaw and a file. Cut the screw to length and make a slot. Dress it with the file. Done.

RRM


Except for one problem: set screws are made of hardened steel for a reason. They need to cut into the metal shaft of a control or switch. Using a screw of the same hardness doesn't work well.

Besides, you can get a hundred set screws for $10 to $15. An awful lot easier than using a hacksaw.


Yes "real" ones are hardened but I've never had a problem with homemade ones and I didn't have to wait for an order or drive to the store. It only takes about 5 minutes to make one.

When I run into a situation where the set screw (homemade or not) needs to be extra tight not to slip I file a flat into the shaft to give it a better grip.

RRM


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 Post subject: Re: Where to get a set screw for a Heathkit knob
PostPosted: Mar Fri 09, 2018 5:15 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Maryland 20709, USA
I would suggest using Allen setscrews rather than slotted ones.

Allen screws of all types are hardened more than slotted or phillips of the same type.

- Leigh

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 Post subject: Re: Where to get a set screw for a Heathkit knob
PostPosted: Mar Sat 10, 2018 9:16 am 
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Joined: Nov Mon 02, 2009 7:01 am
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Location: Lincoln City, OR
Greetings to the Forum:

One note of caution.... if you are working on a radio from the UK, you will need a grub screw rather than a set screw. :D

Regards,

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 Post subject: Re: Where to get a set screw for a Heathkit knob
PostPosted: Mar Sun 11, 2018 5:00 am 
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Joined: Jun Sat 09, 2007 8:14 am
Posts: 3457
Location: Florida
Yes and if you need to tighten a nut you'll need a spanner. If it's dark you'll also need a torch.

RRM


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