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15th Mar 2018, 3:07 am | #1 |
Nonode
Join Date: Oct 2010
Location: Tintinara, South Australia, Australia
Posts: 2,339
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Denco coil former 3D print
Not really sure where this should go, so, as it is a website link, I put it here.
There was/were some postings about DIY Denco coil formers a little while ago and while looking for something completely different, I came across this 3d printed version:- http://213.114.131.21/3d/denco_sub_01.htm Don't be put of by the numbers (ip address) as the site address, it belongs to Harry Lythall - SM0VPO, a well known experimenter in electronics and is safe. |
15th Mar 2018, 10:07 am | #2 |
Dekatron
Join Date: Jun 2016
Location: London, UK.
Posts: 3,687
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Re: Denco coil former 3d print
That's rather good. I'm building up reasons to buy a 3d printer and this is yet another one!
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15th Mar 2018, 12:29 pm | #3 |
Rest in Peace
Join Date: Mar 2006
Location: N.W. Oxfordshire(Chipping Norton)
Posts: 7,306
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Re: Denco coil former 3D print
The only problem with those coils is that they (presumably) won't plug into a noval (B9A) valve-holder as did the original Green, Red , Yellow, Blue & White Denco Coils. I guess nowadays,though, soldering them to veroboard would be preferred by constructors.
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15th Mar 2018, 12:34 pm | #4 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,998
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Re: Denco coil former 3D print
Fascinating! I wonder what the dielectric-properties are of the typical 3D-printer 'glue sticks' ?? Some kinds of plastic can be horribly RF-lossy [I've seen plastic tube of unknown provenance used to make 'traps' for antennas which has collapsed totally if challenged with 100 Watts of RF]
From memory, the original Denco coils had Polystyrene formers. They were never really good enough for stable HF-band VFOs. |
15th Mar 2018, 1:25 pm | #5 |
Hexode
Join Date: Apr 2017
Location: Falkirk, Stirling, UK.
Posts: 336
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Re: Denco coil former 3D print
I recently got myself a 3d printer and have designed and printed a few useful things such as hoover parts. In the vintage radio hobby I was thinking replacement knobs would be a possibility and this is a very good idea too. I am however not very good at CAD so it's difficult but I'm learning slowly. Fortunately the community has a lot of designs ready made to occupy my time.
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15th Mar 2018, 2:29 pm | #6 |
Guest
Posts: n/a
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Re: Denco coil former 3D print
To make a B9A 'plug' could one print around pins stuck in a socket?
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15th Mar 2018, 11:18 pm | #7 |
Hexode
Join Date: Apr 2017
Location: Falkirk, Stirling, UK.
Posts: 336
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Re: Denco coil former 3D print
Unfortunately this wouldn't work as the print head would hit the pins as it moved back and forth building up the layers. It would probably be possible to make an interference fit, maybe with a dab of glue to hold them in place. The accuracy of the 3d printer frequently amazes me, I can even get a working screw thread out of it.
Cameron |
16th Mar 2018, 12:37 am | #8 | |
Nonode
Join Date: Oct 2010
Location: Tintinara, South Australia, Australia
Posts: 2,339
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Re: Denco coil former 3d print
Quote:
The 3 axis cnc and small lathe are still in their boxes from 8 years ago (every time we move, the house we move into gets smaller and smaller). Wonder if I can get the local Mens Shed to invest in a 3d printer? |
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16th Mar 2018, 6:43 pm | #9 | |
Dekatron
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,560
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Re: Denco coil former 3D print
Quote:
In reality though, with AM broadcasting so much in decline now I would, sadly, be very unlikely to start a scratchbuild project like that now even if the Denco ranges of front end, oscillator and IFT coils were still widely available. |
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18th Mar 2018, 9:25 pm | #10 |
Hexode
Join Date: Jan 2013
Location: Ă…lesund, Norway
Posts: 361
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Re: Denco coil former 3D print
Birket has had B9A and B7G plugs until recently.
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