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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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19th Jan 2020, 11:52 am | #1 |
Pentode
Join Date: Mar 2003
Location: Heathfield, East Sussex, UK,
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Crimping dial cords
Restringing dial cords is rarely easy, and one of the most difficult tasks is making the knots to connect the cord to to the tension spring. Sometimes though instead of a knot the cord is crimped, which would be much easier if one had access to the right crimps and possibly the correct crimping tool. Any suggestions?
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19th Jan 2020, 12:09 pm | #2 |
Nonode
Join Date: Jan 2010
Location: Edinburgh, UK.
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Re: Crimping dial cords
Search Ebay for jewellery making crimps. The tools are also available on Ebay.
Al
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19th Jan 2020, 1:39 pm | #3 |
Pentode
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Re: Crimping dial cords
Perfect. Thanks.
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19th Jan 2020, 2:37 pm | #4 |
Octode
Join Date: Sep 2017
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Re: Crimping dial cords
"one of the most difficult tasks is making the knots to connect the cord to to the tension spring."
I find the easiest way is form a loop through the "eye" of the spring, put in a few twists, and seal the twist with a blob of superglue. Mike |
19th Jan 2020, 2:45 pm | #5 |
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Re: Crimping dial cords
My way is to do a single overhand knot, pull 'till it is the right tension and mark with a felt pen (held in teeth). Slip the cord off something so it goes slack, then you can make a proper reef knot with no tension in the right place. Put cord back on and viola!
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19th Jan 2020, 2:52 pm | #6 |
Dekatron
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Location: Greater Manchester, UK.
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Re: Crimping dial cords
I find it "helpful" to imagine how many sets the ladies in the factory could have strung, in the time I am struggling to position a single knot...
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19th Jan 2020, 3:08 pm | #7 |
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Re: Crimping dial cords
I get my misses to tie the knots for me, its surprising how delicate the "iron fist in the velvet glove" can be..
poppydog |
19th Jan 2020, 3:09 pm | #8 |
Nonode
Join Date: Dec 2012
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Re: Crimping dial cords
I love the professional feel of anything crimped and I recently bought a circular crimping tool to crimp ferrules. The crimper probably came from Banggood in China, the plain ferrules from eBay. (If you buy from Banggood set up an account first so that you get the full guarantee service)
Use the smallest practical ferrule diameter, they will crimp down literally to zero diameter
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19th Jan 2020, 3:24 pm | #9 |
Dekatron
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Re: Crimping dial cords
Probably find the string was made up to the correct length and knotted using a jig before it got anywhere near the radio.
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19th Jan 2020, 3:24 pm | #10 |
Heptode
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Re: Crimping dial cords
I have never used them for other than the stainless steel wire intended for (not in the original application) but I have some crimps that are used for stainless steel wire used in fishing. It might be worth a look to see if they are suitable (possibly too small but I have not checked)?
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19th Jan 2020, 3:40 pm | #11 |
Nonode
Join Date: Jan 2010
Location: Edinburgh, UK.
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Re: Crimping dial cords
This thread about knots may also be useful.
https://www.vintage-radio.net/forum/...d.php?t=142721 Al
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19th Jan 2020, 4:02 pm | #12 |
Dekatron
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Re: Crimping dial cords
I believe that dial cords were originally tied with a knot called the 'perfection loop'.
A technique which I've yet to master!
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19th Jan 2020, 6:04 pm | #13 |
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Re: Crimping dial cords
That looks exactly like a Bowline knot, designed to tighten with more pressure applied.
You can also try a Blood knot, which can also be used to tie onto a ring. Mike |
19th Jan 2020, 6:32 pm | #14 |
Octode
Join Date: Sep 2017
Location: Bristol, UK.
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Re: Crimping dial cords
On this topic, is anyone able to direct me to a source of "traditional" tuning cord? I have tried fishing line (to avoid stretchability), and it doesn't grip properly on plastic pulleys. Haven't yet tried abrading the surfaces, but better to get the proper stuff.
Mike |
19th Jan 2020, 6:50 pm | #15 | |
Octode
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Location: Glasgow, UK.
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Re: Crimping dial cords
Quote:
https://www.bendijkman.nl/index.php?...oduct&ipath=16 Ben also provides this advice: - https://www.bendijkman.nl/how-to-kno...ord-2?ipath=16
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19th Jan 2020, 7:09 pm | #16 |
Octode
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Re: Crimping dial cords
Thanks for that Donald. Looks perfect, but I can't see any way of actually placing an order on their website!
Mike |
19th Jan 2020, 10:31 pm | #17 |
Dekatron
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Re: Crimping dial cords
You could try whipping twine, which you should find in a yacht chandlers. It is inextensible and available in waxed polyester in a variety of diameters and colours, usually on 3" spools.
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20th Jan 2020, 10:49 am | #18 | |
Octode
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Re: Crimping dial cords
Quote:
Info@bendijkman.nl
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20th Jan 2020, 11:54 am | #19 |
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Re: Crimping dial cords
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20th Jan 2020, 4:50 pm | #20 | |
Tetrode
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Re: Crimping dial cords
Quote:
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