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3rd May 2017, 5:51 pm | #1 |
Dekatron
Join Date: Nov 2006
Location: London, UK.
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Frame aerial - wire attachment, hive-mind?
Hi folks ,
Here is my initial design for what I'm calling the 'Snooker-Frame Six' frame aerial. It is actually a resonant loop in a helix, just one turn of 2mm wire around the wooden hexagonal frame. Some of you will know I have limited workshop facilities . I now that many of you are resourceful and inventive and so I'm interested in fairly simple ways to keep a wire loop taut t the frame . Transparent epoxy resin would do it fairly well but there may be better ways . I was thinking of cutting 18 small blocks with a notch in the centre to tension the wire , but even this amount of cutting or 'fettling' is too much for right now . Thank you
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Al |
3rd May 2017, 6:38 pm | #2 |
Heptode
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Location: Lincoln, Lincolnshire, UK.
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Re: Frame aerial - wire attachment, hive-mind?
I cannot instantly see the mechanical method but an expanding star in the centre would be adjustable to vary the circumference. If this were sprung the tension would be self adjusting. It would require each turn to be identical in tension.
I think perhaps a bit too complex but may spur better ideas. My own frame aerial of similar size has four spokes and small blocks with grooves, as you suggest. It is a square. There is no method of adjustment for tension, but I have not found it and issue. |
3rd May 2017, 6:55 pm | #3 |
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Re: Frame aerial - wire attachment, hive-mind?
An idea...
Make the wire a shade shorter than it needs to be, when secured to the 'bottom' triangle. Then force in the last triangle tensioning it. |
3rd May 2017, 7:47 pm | #4 |
Dekatron
Join Date: Apr 2012
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Re: Frame aerial - wire attachment, hive-mind?
Idea: Put the snooker-frames in the freezer [or blast them with a CO2 fire extinguisner?] to shrink them before quickly winding the coil? As they warm up they'll expand and tension the windings.
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3rd May 2017, 8:15 pm | #5 |
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Re: Frame aerial - wire attachment, hive-mind?
Or the other way round, pass a current through the wire to warm it up, wind and turn current off.
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3rd May 2017, 8:28 pm | #6 |
Dekatron
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Re: Frame aerial - wire attachment, hive-mind?
Like it, like it. Only the thing is 2 metres in diameter, so no room in my freezer. (I've already bonded the frames together, you see...)
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Al |
3rd May 2017, 8:33 pm | #7 | |
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Re: Frame aerial - wire attachment, hive-mind?
Quote:
How much current will do the trick, do you think? It's 2mm dia single strand so is 20A enough to heat it decisively?
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Al |
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3rd May 2017, 8:35 pm | #8 |
Dekatron
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Re: Frame aerial - wire attachment, hive-mind?
Good idea, like it. The reason tension is an issue with mine is it's single turn of single strand of a beefy diameter and will be wound over a varnished surfaced (although I can rub it down with glasspaper to matt it down, I realise).
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Al |
3rd May 2017, 8:44 pm | #9 |
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Re: Frame aerial - wire attachment, hive-mind?
Six rubber bands pulling the windings into the dimples at the apices?
A bit of an anticlimax after the other suggestions David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done |
3rd May 2017, 10:18 pm | #10 | |
Dekatron
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Re: Frame aerial - wire attachment, hive-mind?
Quote:
definitely maybe!!
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Al |
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4th May 2017, 6:52 am | #11 |
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Re: Frame aerial - wire attachment, hive-mind?
Don't forget to 'kill' the wire first, by stretching it a bit first in one long length.
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4th May 2017, 7:34 am | #12 |
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Re: Frame aerial - wire attachment, hive-mind?
With structural wire, if you make an assembly jig, you can make your frame aerial using only three of your snooker triangles.
So you can have TWO aerials! David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done |
4th May 2017, 9:13 am | #13 |
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Re: Frame aerial - wire attachment, hive-mind?
Two opposing wedges.
Lawrence. |
4th May 2017, 3:30 pm | #14 |
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Re: Frame aerial - wire attachment, hive-mind?
I like your thinking, David. Only I've already bonded them all together and they look great as a hexagon!
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Al |
4th May 2017, 3:31 pm | #15 |
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Re: Frame aerial - wire attachment, hive-mind?
Good thinking, MM. I wouldn't have thought of this. Cheers!
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Al |