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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Lamp Repair using a Rigger's Constricting Knot
On Dec 8, 2015, Joe Gwinn wrote
(in article ): Yesterday, I noticed that the lamp hanging over the kitchen sink was no longer hanging by the woven polyester cable sheath (which is intended to carry the weight of the lamp fixture) and was now hanging by the electrical wires. Which were coming undone - the terminal screws had already backed out a bit. Not good. It turned out that over the five years since installation, the cable sheath had wiggled out of the crimped strain relief ring ferrule at the lamp end of the cable. The ring was crimped by being crushed into a (US) football shape, and one end had broken, reducing the clamping pressure on the cable. Discarded the ferrule. But what to replace it with? In the thread on corrosion when aluminum and stainless steel are in contact, I had mentioned the Rigger's Apprentice book, and their recipes for lanolin as a corrosion preventer. This same book talks of "constrictor knots", used to repair such things as split tillers. Hmm. This could work. So, I replaced the metal ferrule with a double constrictor knot made of nylon cord, all well daubed with Pliobond rubber cement. We'll see how well this works, but it ought to be permanent. Joe Gwinn Ref: "The Complete Rigger's Apprentice - Tools and Techniques for Modern and Traditional Rigging", Brion Toss, International Marine, Camden, Maine, 1998 McGraw-Hill. Followup: It failed already - the constrictor knot just slid off the cable. Probably due to the heat of the lamp softening things. Ill probably make some kind of tight-fitting swage collar of metal. Joe Gwinn |
#2
Posted to rec.crafts.metalworking
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Lamp Repair using a Rigger's Constricting Knot
On Wed, 09 Dec 2015 10:14:48 -0500, Joseph Gwinn
wrote: On Dec 8, 2015, Joe Gwinn wrote (in article ): Yesterday, I noticed that the lamp hanging over the kitchen sink was no longer hanging by the woven polyester cable sheath (which is intended to carry the weight of the lamp fixture) and was now hanging by the electrical wires. Which were coming undone - the terminal screws had already backed out a bit. Not good. It turned out that over the five years since installation, the cable sheath had wiggled out of the crimped strain relief ring ferrule at the lamp end of the cable. The ring was crimped by being crushed into a (US) football shape, and one end had broken, reducing the clamping pressure on the cable. Discarded the ferrule. But what to replace it with? In the thread on corrosion when aluminum and stainless steel are in contact, I had mentioned the Rigger's Apprentice book, and their recipes for lanolin as a corrosion preventer. This same book talks of "constrictor knots", used to repair such things as split tillers. Hmm. This could work. So, I replaced the metal ferrule with a double constrictor knot made of nylon cord, all well daubed with Pliobond rubber cement. We'll see how well this works, but it ought to be permanent. Joe Gwinn Ref: "The Complete Rigger's Apprentice - Tools and Techniques for Modern and Traditional Rigging", Brion Toss, International Marine, Camden, Maine, 1998 McGraw-Hill. Followup: It failed already - the constrictor knot just slid off the cable. Probably due to the heat of the lamp softening things. I’ll probably make some kind of tight-fitting swage collar of metal. Have you considered NOT hanging the lamp by the cord? It has always seemed to be a short waiting to happen, as the knots slip out, knocking off the poorly applied wire nuts... -- Courage and perseverance have a magical talisman, before which difficulties disappear and obstacles vanish into air. -- John Quincy Adams |
#3
Posted to rec.crafts.metalworking
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Lamp Repair using a Rigger's Constricting Knot
On Wed, 09 Dec 2015 10:14:48 -0500
Joseph Gwinn wrote: snip Followup: It failed already - the constrictor knot just slid off the cable.. Probably due to the heat of the lamp softening things. Ill probably make some kind of tight-fitting swage collar of metal. Maybe use some heat-shrink tubing over the knot/area? -- Leon Fisk Grand Rapids MI/Zone 5b Remove no.spam for email |
#4
Posted to rec.crafts.metalworking
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Lamp Repair using a Rigger's Constricting Knot
On Wed, 09 Dec 2015 10:14:48 -0500, Joseph Gwinn
wrote: On Dec 8, 2015, Joe Gwinn wrote (in article ): Yesterday, I noticed that the lamp hanging over the kitchen sink was no longer hanging by the woven polyester cable sheath (which is intended to carry the weight of the lamp fixture) and was now hanging by the electrical wires. Which were coming undone - the terminal screws had already backed out a bit. Not good. It turned out that over the five years since installation, the cable sheath had wiggled out of the crimped strain relief ring ferrule at the lamp end of the cable. The ring was crimped by being crushed into a (US) football shape, and one end had broken, reducing the clamping pressure on the cable. Discarded the ferrule. But what to replace it with? In the thread on corrosion when aluminum and stainless steel are in contact, I had mentioned the Rigger's Apprentice book, and their recipes for lanolin as a corrosion preventer. This same book talks of "constrictor knots", used to repair such things as split tillers. Hmm. This could work. So, I replaced the metal ferrule with a double constrictor knot made of nylon cord, all well daubed with Pliobond rubber cement. We'll see how well this works, but it ought to be permanent. Joe Gwinn Ref: "The Complete Rigger's Apprentice - Tools and Techniques for Modern and Traditional Rigging", Brion Toss, International Marine, Camden, Maine, 1998 McGraw-Hill. Followup: It failed already - the constrictor knot just slid off the cable. Probably due to the heat of the lamp softening things. I’ll probably make some kind of tight-fitting swage collar of metal. Joe Gwinn Would one of these do the job? http://myoasisofficesupplies.com/tes...5mm-small-.jpg |
#5
Posted to rec.crafts.metalworking
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Lamp Repair using a Rigger's Constricting Knot
"Joseph Gwinn" wrote in message s.com... On Dec 8, 2015, Joe Gwinn wrote (in article ): Yesterday, I noticed that the lamp hanging over the kitchen sink was no longer hanging by the woven polyester cable sheath (which is intended to carry the weight of the lamp fixture) and was now hanging by the electrical wires. Which were coming undone - the terminal screws had already backed out a bit. Not good. It turned out that over the five years since installation, the cable sheath had wiggled out of the crimped strain relief ring ferrule at the lamp end of the cable. The ring was crimped by being crushed into a (US) football shape, and one end had broken, reducing the clamping pressure on the cable. Discarded the ferrule. But what to replace it with? In the thread on corrosion when aluminum and stainless steel are in contact, I had mentioned the Rigger's Apprentice book, and their recipes for lanolin as a corrosion preventer. This same book talks of "constrictor knots", used to repair such things as split tillers. Hmm. This could work. So, I replaced the metal ferrule with a double constrictor knot made of nylon cord, all well daubed with Pliobond rubber cement. We'll see how well this works, but it ought to be permanent. Joe Gwinn Ref: "The Complete Rigger's Apprentice - Tools and Techniques for Modern and Traditional Rigging", Brion Toss, International Marine, Camden, Maine, 1998 McGraw-Hill. Followup: It failed already - the constrictor knot just slid off the cable. Probably due to the heat of the lamp softening things. I'll probably make some kind of tight-fitting swage collar of metal. Joe Gwinn Yeah. I used know a Rigger like that. I think his first name was Jury. Sorry. Couldn't resist. Steve |
#6
Posted to rec.crafts.metalworking
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Lamp Repair using a Rigger's Constricting Knot
On Wed, 9 Dec 2015 14:35:04 -0600, "SnA Higgins"
wrote: "Joseph Gwinn" wrote in message ws.com... On Dec 8, 2015, Joe Gwinn wrote (in article ): Yesterday, I noticed that the lamp hanging over the kitchen sink was no longer hanging by the woven polyester cable sheath (which is intended to carry the weight of the lamp fixture) and was now hanging by the electrical wires. Which were coming undone - the terminal screws had already backed out a bit. Not good. It turned out that over the five years since installation, the cable sheath had wiggled out of the crimped strain relief ring ferrule at the lamp end of the cable. The ring was crimped by being crushed into a (US) football shape, and one end had broken, reducing the clamping pressure on the cable. Discarded the ferrule. But what to replace it with? In the thread on corrosion when aluminum and stainless steel are in contact, I had mentioned the Rigger's Apprentice book, and their recipes for lanolin as a corrosion preventer. This same book talks of "constrictor knots", used to repair such things as split tillers. Hmm. This could work. So, I replaced the metal ferrule with a double constrictor knot made of nylon cord, all well daubed with Pliobond rubber cement. We'll see how well this works, but it ought to be permanent. Joe Gwinn Ref: "The Complete Rigger's Apprentice - Tools and Techniques for Modern and Traditional Rigging", Brion Toss, International Marine, Camden, Maine, 1998 McGraw-Hill. Followup: It failed already - the constrictor knot just slid off the cable. Probably due to the heat of the lamp softening things. I'll probably make some kind of tight-fitting swage collar of metal. Joe Gwinn Yeah. I used know a Rigger like that. I think his first name was Jury. He had another brother, Jerry, who used to MacGuyver things in der Deutchland back in WWII. Sorry. Couldn't resist. Ditto. -- Creativity can solve almost any problem. The creative act, the defeat of habit by originality, overcomes everything. -- George Lois |
#7
Posted to rec.crafts.metalworking
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Lamp Repair using a Rigger's Constricting Knot
On 2015-12-09, Joseph Gwinn wrote:
On Dec 8, 2015, Joe Gwinn wrote (in article ): Yesterday, I noticed that the lamp hanging over the kitchen sink was no longer hanging by the woven polyester cable sheath (which is intended to carry the weight of the lamp fixture) and was now hanging by the electrical wires. Which were coming undone - the terminal screws had already backed out a bit. Not good. [ ... ] This same book talks of "constrictor knots", used to repair such things as split tillers. Hmm. This could work. So, I replaced the metal ferrule with a double constrictor knot made of nylon cord, all well daubed with Pliobond rubber cement. We'll see how well this works, but it ought to be permanent. [ ... ] Followup: It failed already - the constrictor knot just slid off the cable. Probably due to the heat of the lamp softening things. I?ll probably make some kind of tight-fitting swage collar of metal. Hmm ... do you happen to have crimpers for coax RF connectors? Perhaps one of the sleeves which go around the shield to crimp it to the body of the connector would work -- if the size is right. I would probably try to turn up a sleeve to go inside the jacket of the cable so there would be something for the round crushed to hex ferrule to press against. BTW You can still find Pliobond somewhere? I haven't seen it for years, and have to use the alternative rubber cement brand. Good Luck, DoN. -- Remove oil spill source from e-mail Email: | (KV4PH) Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#8
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Lamp Repair using a Rigger's Constricting Knot
On 2015-12-09, Larry Jaques wrote:
On Wed, 09 Dec 2015 10:14:48 -0500, Joseph Gwinn wrote: On Dec 8, 2015, Joe Gwinn wrote (in article ): This same book talks of "constrictor knots", used to repair such things as split tillers. Hmm. This could work. So, I replaced the metal ferrule with a double constrictor knot made of nylon cord, all well daubed with Pliobond rubber cement. We'll see how well this works, but it ought to be permanent. [ ... ] Followup: It failed already - the constrictor knot just slid off the cable. Probably due to the heat of the lamp softening things. I’ll probably make some kind of tight-fitting swage collar of metal. Have you considered NOT hanging the lamp by the cord? It has always seemed to be a short waiting to happen, as the knots slip out, knocking off the poorly applied wire nuts... Well ... there is the "Underwriter's Knot", which used to be used to keep wires from pulling out of fixtures -- back before things like the Heyco strain relief nuts replaced grommets. (And the knot did not even require a special tool, unlike the Heyco strain relief nuts. O.K. This site gives a video: https://www.youtube.com/watch?v=KHRaRRWW34w And this one is pure text: http://www.howtodothings.com/home-garden/how-to-tie-an-underwriters-knot Enjoy, DoN. -- Remove oil spill source from e-mail Email: | (KV4PH) Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#9
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Lamp Repair using a Rigger's Constricting Knot
On Wednesday, December 9, 2015 at 8:39:21 PM UTC-5, DoN. Nichols wrote:
On 2015-12-09, Larry Jaques wrote: On Wed, 09 Dec 2015 10:14:48 -0500, Joseph Gwinn wrote: On Dec 8, 2015, Joe Gwinn wrote (in article ): This same book talks of "constrictor knots", used to repair such things as split tillers. Hmm. This could work. So, I replaced the metal ferrule with a double constrictor knot made of nylon cord, all well daubed with Pliobond rubber cement. We'll see how well this works, but it ought to be permanent. [ ... ] Followup: It failed already - the constrictor knot just slid off the cable. Probably due to the heat of the lamp softening things. I'll probably make some kind of tight-fitting swage collar of metal. Have you considered NOT hanging the lamp by the cord? It has always seemed to be a short waiting to happen, as the knots slip out, knocking off the poorly applied wire nuts... Well ... there is the "Underwriter's Knot", which used to be used to keep wires from pulling out of fixtures -- back before things like the Heyco strain relief nuts replaced grommets. (And the knot did not even require a special tool, unlike the Heyco strain relief nuts. O.K. This site gives a video: https://www.youtube.com/watch?v=KHRaRRWW34w And this one is pure text: http://www.howtodothings.com/home-garden/how-to-tie-an-underwriters-knot Enjoy, DoN. -- Remove oil spill source from e-mail Email: | (KV4PH) Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- I wonder how many lamps are strain-relieved by underwriters knots. Tens of millions, perhaps? This was one of the first 'electrical' things I ever learned. Meanwhile, I watched the video, which was perfect. Then I watched another about the 'truckers hitch.' That's a new one on me. I always use ratchet strap tiedowns, but I do like this knot. |
#10
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Lamp Repair using a Rigger's Constricting Knot
In article , DoN.
Nichols wrote: On 2015-12-09, Joseph Gwinn wrote: On Dec 8, 2015, Joe Gwinn wrote (in article ): Yesterday, I noticed that the lamp hanging over the kitchen sink was no longer hanging by the woven polyester cable sheath (which is intended to carry the weight of the lamp fixture) and was now hanging by the electrical wires. Which were coming undone - the terminal screws had already backed out a bit. Not good. [ ... ] This same book talks of "constrictor knots", used to repair such things as split tillers. Hmm. This could work. So, I replaced the metal ferrule with a double constrictor knot made of nylon cord, all well daubed with Pliobond rubber cement. We'll see how well this works, but it ought to be permanent. [ ... ] Followup: It failed already - the constrictor knot just slid off the cable. Probably due to the heat of the lamp softening things. I?ll probably make some kind of tight-fitting swage collar of metal. Hmm ... do you happen to have crimpers for coax RF connectors? Perhaps one of the sleeves which go around the shield to crimp it to the body of the connector would work -- if the size is right. I would probably try to turn up a sleeve to go inside the jacket of the cable so there would be something for the round crushed to hex ferrule to press against. I do have such crimpers and can make a ferrule, and was considering doing just this. Maybe wetted with epoxy before crimping. BTW You can still find Pliobond somewhere? I haven't seen it for years, and have to use the alternative rubber cement brand. I think so, although Goodyear sold the line. I have a half-pint steel can with brush, bought from McMaster-Carr in May 2012, of "Pliobond 25". It is made by The Ruscoe Company of Akron, Ohio. The product code seems to be PBC-25-LV. The Pliobond trademark appears to be owned by Ashland, Inc. I also have "Super Contact Cement" (cat no 8336) made by MG Chemicals. This also seems to be pliobond rubber cement, but without the trademark name. Joie Gwinn |
#11
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Lamp Repair using a Rigger's Constricting Knot
In article , DoN.
Nichols wrote: On 2015-12-09, Larry Jaques wrote: On Wed, 09 Dec 2015 10:14:48 -0500, Joseph Gwinn wrote: On Dec 8, 2015, Joe Gwinn wrote (in article ): This same book talks of "constrictor knots", used to repair such things as split tillers. Hmm. This could work. So, I replaced the metal ferrule with a double constrictor knot made of nylon cord, all well daubed with Pliobond rubber cement. We'll see how well this works, but it ought to be permanent. [ ... ] Followup: It failed already - the constrictor knot just slid off the cable. Probably due to the heat of the lamp softening things. I’ll probably make some kind of tight-fitting swage collar of metal. Have you considered NOT hanging the lamp by the cord? It has always seemed to be a short waiting to happen, as the knots slip out, knocking off the poorly applied wire nuts... Well ... there is the "Underwriter's Knot", which used to be used to keep wires from pulling out of fixtures -- back before things like the Heyco strain relief nuts replaced grommets. (And the knot did not even require a special tool, unlike the Heyco strain relief nuts. O.K. This site gives a video: https://www.youtube.com/watch?v=KHRaRRWW34w And this one is pure text: http://www.howtodothings.com/home-garden/how-to-tie-an-underwriters-knot I do know of underwriter's knots. It's possible, but I would push the sleeve back first, tie the knot, and slide the sleeve back over the knot, making a bump in the sleeve. Joe Gwinn |
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