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Author Topic: How do I make a homemade replacement for a commercial radial?  (Read 1636 times)
KD4EBL
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Posts: 75




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« on: March 23, 2012, 11:00:30 AM »

I have a Crushcraft ARX-2B that one of the radials broke off of. Now I can buy a replacement for 12 bucks shipped, but I have a piece of aluminum rod that is the right length and diameter. 1/4 x 20 1/2 rod. what do I use to add the threading on the end?  How hard is it to do? is it worth it to try to match the commercial part or should I just buy the replacement?
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W0FM
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Posts: 2057




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« Reply #1 on: March 23, 2012, 11:24:50 AM »

If you can remove another radial from the antenna, take that radial and the aluminum replacement rod you have to a local machine shop and ask them to add matching threads to the end of the replacement rod.  Should cost very little.  A box of donuts might even get 'er done.

73,

Terry, WØFM
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KD4EBL
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Posts: 75




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« Reply #2 on: March 23, 2012, 11:41:46 AM »

Thanks Terry,
I realized I have a old (never used by me)tap and die set, is that what I would use to make the threads?
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W0FM
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Posts: 2057




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« Reply #3 on: March 23, 2012, 11:45:19 AM »

Sure thing.  I almost wrote that, but thought it would be unlikely someone would own a tap and die set.  Just match up the thread size, select the correct die and thread the rod.  Then treat YOURSELF to a box of donuts since you saved the money!  Good luck.

73,

Terry, WØFM
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KG4NEL
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Posts: 443




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« Reply #4 on: March 23, 2012, 11:47:54 AM »

Sure thing.  I almost wrote that, but thought it would be unlikely someone would own a tap and die set.

We're hams. If anyone is going to own a #2 reverse-thread metric Pozidrive, it'd be us Cheesy
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K7KBN
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Posts: 2836




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« Reply #5 on: March 24, 2012, 11:44:54 AM »

I have a tap that can cut left-hand threads on the inner surface of a Möbius strip!  Grin

Much like the Ambihelical Hexnut: http://mathworld.wolfram.com/AmbihelicalHexnut.html
« Last Edit: March 24, 2012, 11:46:42 AM by K7KBN » Logged

73
Pat K7KBN
CWO4 USNR Ret.
KD4EBL
Member

Posts: 75




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« Reply #6 on: March 27, 2012, 05:11:45 AM »

Wow, that was easy!
I took out the tap and die set (discovered I actually have two, a standard and metric set). Four minutes later there were new threads on the old radial. I am going to try the old one first (lost about 1.5 inches when it broke) and then go on to making a new one to see if there might be a different in the SWR.
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