Pulling fine wire through sleeving query

I need to pull some doubled up , 0.22mm (9 mil, SWG 34, AWG 32) Cu wire through small bore sleeving. Some 0.3mm nichrome heater element wire stretched out until straight, worked rigidly enough, with "peristaltic" movement as a mouse (does this term translate across the pond ?) . I was probably lucky that "soldering" the copper to the ni-chrome made a sufficient strength overlap join to pull 1 wire through but I doubt it would work pulling 2 through, soldered or glued, because of added thickness of overlap bulge, when I have to repeat the process for the double one.

Can anyone think of a source for thin wall ferrule / coupler to solder or probably glue over a butt join between mouse and 2 Cu wires, of these sorts of dimensions. Butchered mini-din socket pins are a bit too big diameter, but anything like that ?

Reply to
N Cook
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Try a fishing tackle shop, ask to look at trace crimps.

Ron(UK)

Reply to
Ron(UK)

Is the sleeving at all flexible? Probably if you snaked it thru. Stick it inside a hose, seal the ends with hot-melt and suck a vacuum between the pipes to swell the inner one. Apply some power to heat up the wire...depends on what the sleeve is made of. Might be able to accomplish the same thing with air pressure to pre-stretch the sleeving. To do it while you're pulling would require some fixturing, peanut butter jar and some hose.

Is there any reason you can't make one overlap with the nichrome and a second overlap of just two coppers further back? A drop of superglue along a quarter-inch of paralleled wire is probably stronger than the wire. But you gotta pull two on the tensile strength of one. Sometimes a hammer can fix a bulge. Lead and copper are pretty ductile. Mash the nichrome flat then flatten the copper, solder it together under pressure. Trim with a hammer. Solder paste works well when you need to limit the amount to less than the surface tension would ordinarily allow. Spot welder? Think about tweezers with insulated sides. Squeeze the wires together and hit the tweezers with a charged cap. Probably take several tries, but if you're not making a production line...

Just curious...what's wrong with bigger sleeving or heat shrink? You don't say the bore or how far you're pulling it, but you might be putting a lot of stress on tiny wire with thin insulation. Reliability problem?

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Reply to
mike

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sorts

Ta, the nearest to a solution so far. 0.8mm internal bore seems the smallest they go to. Grinding a lead-in chamfer on the leading edge , and feeding through a tiny funnel of talcum powder may just work.

Now what to do with the other 49 little crimps. They seem to be brass with a coating of dull varnish to dull them down for fishing purposes.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N Cook

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Would "soaping" the wire help, or are you already doing that?

Reply to
Mr. Land

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I doubt if one atmosphere of pressure would make any diffenence to sub 1mm bore sleeving.

I hadn't thought of flattening at the join. I will try that if the fishing trace crimp doesn't work.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N Cook

would

sorts

like

Would "soaping" the wire help, or are you already doing that?

I tend to use talc for that purpose.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N Cook

We use them in the theatre, they are by far the best way of joining or putting loops in fine fishing line.

Ron(UK)

Reply to
Ron(UK)

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For swinging/flying actors around the stage - Peter Pan fashion ?

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N Cook

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I meant something like this:

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Apologies if you already realized this was what I was suggesting.

Reply to
Mr. Land

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I meant something like this:

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Apologies if you already realized this was what I was suggesting.

I suspect that is for high clearance pulls. I've previously found that constricted pulls should be done dry, eg silicone oil hinders , so I'm assuming this product would as well. Presumably due to distributed surface tension of a constricted long run.

I assume that mouse is a recognised term both sides of the Atlantic for the stidd wire threaders for existing conduit runs. Is it a myth that it derives from tying a thread to a mouse tail , let it run through conduit etc, and then pull through cables etc tied to the thread.?

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N Cook

While at fishing shop , bought a spool of fine line. Just to try the following - anyone been there before, ie wasting my time. Connect a source of vacuum at one end of the sleeving core and introduce some fine nylon line at the other, set turning on a small motor .

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N Cook

Not a good idea to put *any* splices in those cables. Better to simply replace the whole lot if too short for some reason. I was helping rig a lighting truss to which someone had affixed a 3'x12' wood and plastic sign. The initial installation left the sign too high, so the decorators simply spliced in additional cable using ferrules and a swaging tool. I had six folks on the ground holding the free ends of blocks & falls (more commonly known as block and tackle), while my head rigger was above, securing each in turn.

As he did each one, there was inevitably a small amount of slack let out...nothing serious, but each connection bumped down a little less than an inch when the slack was let off and secured.

On the second point, when the 'bump' happened, one ferrule failed. That end of the sign came swinging down in an arc with an audible WHOOSH! right past everybody's face! To their credit, nobody let go of their respective ropes, but the free end of the sign missed one poor lady by less than a couple feet.

Once it had swung past vertical, the other end let go as well, and the whole thing crashed at our feet and shattered. No injuries, but some wardrobe changes were in order once the truss was let back down.

No splices, please....

jak

Reply to
jakdedert

solder

these

The sound recording from December 4th, 1958 of this is better, for an example of perfect comic timing, but text

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THE BRICKLAYER'S STORY by Gerard Hoffnung (from his Oxford Union speech)

I've got this thing here that I must read to you. Now, this is a very tragic thing... I shouldn't, really, read it out. A striking lesson in keeping the upper lip stiff is given in a recent number of the weekly bulletin of 'The Federation of Civil Engineering Contractors' that prints the following letter from a bricklayer in Golders Green to the firm for whom he works.

Respected sir,

when I got to the top of the building, I found that the hurricane had knocked down some bricks off the top. So I rigged up a beam, with a pulley, at the top of the building and hoisted up a couple of barrels of bricks. When I had fixed the building, there was a lot of bricks left over. I hoisted the barrel back up again and secured the line at the bottom and then went up and filled the barrel with the extra bricks. Then, I went to the bottom and cast off the rope. Unfortunately, the barrel of bricks was heavier than I was and before I knew what was happening, the barrel started down, jerking me off the ground. I decided to hang on! Halfway up, I met the barrel coming down... and received a severe blow on the shoulder. I then continued to the top, banging my head against the beam and getting my fingers jammed in the pulley! When the barrel hit the ground, it burst it's bottom... allowing all the bricks to spill out. I was now heavier than the barrel and so started down again at high speed! Halfway down... I met the barrel coming up and received severe injury to my shins! When I hit the ground... I landed on the bricks, getting several painful cuts from the sharp edges! At this point... I must have lost my presence of mind... because I let go of the line! The barrel then came down... giving me a very heavy blow and putting me in hospital!

I respectfully request 'sick leave'.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N Cook

Erm... no, that needs something a little stronger than fishing line!

Ron(UK)

Reply to
Ron(UK)

Cable companies regularly use ferrets to pull a cord through trunking, I`ve seen it done.

Ron

Reply to
Ron(UK)

Indeed. There are very strict and specific regulations for the flying of any structure in theatreland. Fishing line is only used for very lightweight materials such as scrims and holding back swags etc. Anything of any substance must be flown using steel rope and the proper fittings applied in a precise manner. Anything flown above 2 metres must have at least one secondary safety bond to something that isn't going to come down.

Ron(UK)

Reply to
Ron(UK)

Inever knew where that one originated, but like most such, there's probably an element of truth involved. In my case, it was exactly as stated...with only details (loacation etc) left out.

jak

Reply to
jakdedert

Indeed...not always done, however in the case of signage. Our (my) liability in this case was not properly inspecting the work of another contractor...complicated by the fact that it was another 'trade' organization. In fact, we should have crossed that trade boundary and done the work ourselves (which we in fact did, after the fact...once they rebuilt the sign).

jak

Reply to
jakdedert

As I understand it, it was originally a music hall song or monologue from the 1920`s' tho often attributed to Dominic or Brendan Behan, Pat Cooksey and several others along the way. Jolly funny tho

Ron(UK)

Reply to
Ron(UK)

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