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Author Topic: Trying to make my own antenna clamps.  (Read 2037 times)

Al Rettich

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Trying to make my own antenna clamps.
« on: January 17, 2018, 11:12:54 am »

I have quite a few wrap around clamps. The problem i'm finding is getting a 5/8" fine thread screw to go through the clamp into the antenna. Do any of you know of something that works?
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Keith Broughton

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Re: Trying to make my own antenna clamps.
« Reply #1 on: January 17, 2018, 11:19:02 am »

I have quite a few wrap around clamps. The problem i'm finding is getting a 5/8" fine thread screw to go through the clamp into the antenna. Do any of you know of something that works?
I use pony clips and drill a 3/8 hole for a bolt to go into one of the 3/8 NC to 5/8 NF adapters that come with most mic clips.
Also have a "jamb nut" from a mic stand for the 5/8 side of the adapter.
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Scott Helmke

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Re: Trying to make my own antenna clamps.
« Reply #2 on: January 17, 2018, 12:23:49 pm »

I use pony clips and drill a 3/8 hole for a bolt to go into one of the 3/8 NC to 5/8 NF adapters that come with most mic clips.
Also have a "jamb nut" from a mic stand for the 5/8 side of the adapter.

Exactly what we do - got dozens of them.
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Al Rettich

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Re: Trying to make my own antenna clamps.
« Reply #3 on: January 17, 2018, 12:49:52 pm »

Done that as well. Sadly this is going up for a six month install around a 1 1/2" pipe. It's covered, but will still be outside. I know that the bolt I'm looking for is a tapered 5/8"-27 thread at most 2" long. Been hunting, with no luck.
I use pony clips and drill a 3/8 hole for a bolt to go into one of the 3/8 NC to 5/8 NF adapters that come with most mic clips.
Also have a "jamb nut" from a mic stand for the 5/8 side of the adapter.
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Brian Bolly

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Re: Trying to make my own antenna clamps.
« Reply #4 on: January 17, 2018, 01:16:47 pm »

Done that as well. Sadly this is going up for a six month install around a 1 1/2" pipe. It's covered, but will still be outside. I know that the bolt I'm looking for is a tapered 5/8"-27 thread at most 2" long. Been hunting, with no luck.

I've used these with some Mega Clamps.  I'm sure with some coupling nuts they could easily be adapted to Mega Couplers or similar.
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Scott Helmke

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Re: Trying to make my own antenna clamps.
« Reply #5 on: January 17, 2018, 01:38:41 pm »

How are you with a drill press and thread tap?

This is just an old lighting clamp, with some threaded 3/8"-16 rod and one of those adapters that came with a mic.
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Chris Johnson [UK]

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Re: Trying to make my own antenna clamps.
« Reply #6 on: January 18, 2018, 05:08:13 am »

Manfrotto Super Clamp (or magic arm for extra awesome).

'nuff said.

They aren't cheap, but they are the best.
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Keith Broughton

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Re: Trying to make my own antenna clamps.
« Reply #7 on: January 18, 2018, 06:44:45 am »

install around a 1 1/2" pipe. It's covered, but will still be outside. I know that the bolt I'm looking for is a tapered 5/8"-27 thread at most 2" long.
Could you clarify what requires that type of bolt?
Do you mean a tapered head (flat head) and why so long?...no the install time ;)
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Al Rettich

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Re: Trying to make my own antenna clamps.
« Reply #8 on: January 18, 2018, 08:49:31 am »

To fit nicely inside the cheeseborough, it needs to be a tapered head, not a flat head. It's 1/2" through, I thought you could put a jam nut on it to lock it down in place, that would give you plenty of length. As far as the size of bolt, I've learned it's a 5/8" - 27. 5/8" isn't hard to find, but the 27 threads per inch is. 
Could you clarify what requires that type of bolt?
Do you mean a tapered head (flat head) and why so long?...no the install time ;)
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Scott Helmke

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Re: Trying to make my own antenna clamps.
« Reply #9 on: January 18, 2018, 10:02:43 am »

To fit nicely inside the cheeseborough, it needs to be a tapered head, not a flat head. It's 1/2" through, I thought you could put a jam nut on it to lock it down in place, that would give you plenty of length. As far as the size of bolt, I've learned it's a 5/8" - 27. 5/8" isn't hard to find, but the 27 threads per inch is.

OK, helps to know the specific clamp you were talking about. 

I really don't think you're going to just find a 5/8-27 bolt. It would almost certainly be cheaper to modify the cheeseborough to accept a 3/8-16 thread and adapt from there. Add a safety cable and you've got a solution.

Even if you're set on a nice-looking solution it would be cheaper to have a machinist make an adapter than to have that same machinist make a bolt with a weird thread.
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