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1/2" shaft knobs

Crusher

Well-Known Member
May 12, 2007
838
370
73
Anyone know where I can find knobs for a vacuum capacitor with 1/2" shaft. Its harder than it sounds. Tried Mouser and MCM electronics.
 

Captain Kilowatt

Professional Amateur
Staff member
Apr 6, 2005
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Nova Scotia,Canada
You can make them from a short piece of 1/2 inch copper tubing, an end cap, a small hose clamp and a 1/4 inch brass bolt or 1/4 inch bolt/nut. Take a short piece of copper pipe and cut two slits in the end to make it slotted. This end is slipped over the shaft and held secure with the small hose clamp. Drill a hole in the end cap and solder the brass bolt with the head inside the cap. If the bolt is not brass just use a nut and a jam nut to secure it. Solder the cap onto the short copper pipe and you know have a 1/4 inch to 1/2 inch adapter. It may look a little rough but if you are neat and it is not readily seen it is fine.
 
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linearone

King of NY
Apr 2, 2005
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Rotten Apple Trees
www.acboxes.com
You can make them from a short piece of 1/2 inch copper tubing, an end cap, a small hose clamp and a 1/4 inch brass bolt or 1/4 inch bolt/nut. Take a short piece of copper pipe and cut two slits in the end to make it slotted. This end is slipped over the shaft and held secure with the small hose clamp. Drill a hole in the end cap and solder the brass bolt with the head inside the cap. If the bolt is not brass just use a nut and a jam nut to secure it. Solder the cap onto the short copper pipe and you know have a 1/4 inch to 1/2 inch adapter. It may look a little rough but if you are neat and it is not readily seen it is fine.

yucky. Id rater take a piece of 3/4" aluminum rod, bore a 1/2" hole on one end and either turn down the other end to 1/4" or at least bore a 1/4" hole in the other and use a couple setscrews with some rod.

I usually dont even bother. I buy a shaft coupler and drill one side out larger then the other side put a 1/4" rod in and I'm done.
 
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Crusher

Well-Known Member
May 12, 2007
838
370
73
Problem solved. I got rid of capacitor and bought one with a 1/4" shaft. Problem solved.
 

Captain Kilowatt

Professional Amateur
Staff member
Apr 6, 2005
16,847
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Nova Scotia,Canada
yucky. Id rater take a piece of 3/4" aluminum rod, bore a 1/2" hole on one end and either turn down the other end to 1/4" or at least bore a 1/4" hole in the other and use a couple setscrews with some rod.

I usually dont even bother. I buy a shaft coupler and drill one side out larger then the other side put a 1/4" rod in and I'm done.


If you have a lathe then go ahead and turn the end down. I don't have a lathe nor do most people. Like I said it ain't pretty but it works fine. I have seen a lot worse looking stuff in home brew amps.
 
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Crusher

Well-Known Member
May 12, 2007
838
370
73
Yeah I've seen a lot worse too, but its my build and and I didn't want to do any rigging like that. I had a reducer, but then decided I would hav e to mount it further back. Didn't want to do that either. So I spent the money and did it right.
 

Captain Kilowatt

Professional Amateur
Staff member
Apr 6, 2005
16,847
11,000
823
59
Nova Scotia,Canada
Yeah I've seen a lot worse too, but its my build and and I didn't want to do any rigging like that. I had a reducer, but then decided I would hav e to mount it further back. Didn't want to do that either. So I spent the money and did it right.


That is always the best idea but sometimes you get something that is either not worth the money or are just looking to experiment with. Sometimes you just need to make emergency repairs to something and my idea does work. Instead of a small hose clamp you can use a small roll pin thru the shaft to make it look a bit better. It is up to the builder/tech to decide what level of visual appeal he wants.
 

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