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11th Jul 2021, 12:02 am | #1 |
Nonode
Join Date: Dec 2012
Location: Stockport, Greater Manchester, UK.
Posts: 2,117
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Rosin flux needle bottle users
In the now closed thread Liquid Rosin Flux I said to avoid catastrophic spills at all cost because your entire workbench, all the tools and testgear, and your clothes will be ruined. In particular avoid fumbling while handling the bottle as the resulting movement may be unexpected.
In the video The Bizarre Behavior of Rotating Bodies a mathematician explains the Dzhanibekov Effect in simple terms, using a needle bottle as an example
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11th Jul 2021, 2:33 am | #2 |
Dekatron
Join Date: May 2010
Location: Greater Manchester, UK.
Posts: 18,725
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Re: Rosin flux needle bottle users
The Youtube algorithm fed me that video a couple of weeks ago. Very interesting.
What's the deal with liquids in unstable flat-sided bottles? Are they designed to topple over and spill? In the TV rental trade in the '70s we used gallons of Joynes Waxless Polish, which came in a glass flat medicine style bottle. I think most of it was accidentally used to polish the bench tops when the bottle got knocked over.
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11th Jul 2021, 2:57 am | #3 |
Dekatron
Join Date: Apr 2009
Location: Oxfordshire, UK.
Posts: 4,935
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Re: Rosin flux needle bottle users
Most generally, a flat sided-bottle is wide and more visible on the shelf in the supermarket! It's not an efficient use of plastic, and it may well tip over and spill, but the key factor is that it gets sold.
For stuff like flux, that may not be a requirement, but the bottle makers are set up to make bottles of that form. B
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11th Jul 2021, 9:11 am | #4 |
Dekatron
Join Date: Dec 2004
Location: East Yorkshire, UK.
Posts: 3,989
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Re: Rosin flux needle bottle users
I keep the old bottle and decant a small amount from the new bottle, just enough so it does not run out when laid on it side. It will not prevent every spill scenario, but ok for when I knock it on it's side. I do it to tins Brasso as well.
John.
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11th Jul 2021, 10:50 am | #5 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,902
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Re: Rosin flux needle bottle users
Great video!
Planet Earth is a bit more complex than a hard bottle filled with lossy fluid. The surface is somewhat fluid/flexible and floats on the core fluid. The rotation causes forces which make it an oblate spheroid, so the rotation about the axis with maximum moment of inertia is interesting because the rotation sets which axis has the maximum moment of inertia. There seems to be a loop of causality. This could be stable or unstable and I don't know enough to work out which. Additionally, the fluid core is magnetically active, and there are further forces as a consequence. Oh, and there's the movement of the two bulges in the oceans... the tides caused by the moon (and lesser ones due to other bodies...) So now the lunar orbit gets thrown into the mix. It's left me wanting a tennis racquet. Back to radio, soldering and flux. Liquid flux is sticky-messy enough in a nice reliable gravitational field. I'm not sure I'd want to go soldering in zero gravity and releasing little particles of spatter to float around. Solder particles are conductive and flux is chemically active. Nice!. Murphy says they will move to the place of maximum mischief. Needle bottles of liquid flux may not be desirable in orbit. David
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11th Jul 2021, 2:38 pm | #6 |
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Re: Rosin flux needle bottle users
Odd as it sounds I use an aerosol flux can, with gentle pressure I can deliver very small drops of flux from the tube. The tube is clear and I can see the drop arriving, the drops are separated by the propellant gas.
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12th Jul 2021, 4:49 pm | #7 | |
Nonode
Join Date: Jun 2016
Location: Bognor Regis, West Sussex, UK.
Posts: 2,301
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Re: Rosin flux needle bottle users
Quote:
Venus has no moon and has flipped in the past so that it rotates retrograde. Peter |
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16th Jul 2021, 1:58 pm | #8 | |
Heptode
Join Date: Dec 2014
Location: Lincoln, Lincolnshire, UK.
Posts: 583
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Re: Rosin flux needle bottle users
Quote:
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17th Jul 2021, 10:41 pm | #9 |
Tetrode
Join Date: Dec 2017
Location: York, North Yorkshire, UK.
Posts: 65
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Re: Rosin flux needle bottle users
I love my needle bottle. Would struggle without it .
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20th Jul 2021, 1:09 am | #10 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,203
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Re: Rosin flux needle bottle users
I like gel flux better.
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20th Jul 2021, 9:05 pm | #11 |
Dekatron
Join Date: Nov 2003
Location: Fakenham, Norfolk, UK.
Posts: 4,259
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Re: Rosin flux needle bottle users
I see it has ribbing too, so perhaps its form is a survival of a long-established convention for substances "not to be taken" to come in flattened bottles with tactile surfaces easily recognised in dim light and by blind folk once they knew the implied warning. I've picked up several 1920s/30s glass examples at a nearby bottle dump: Jeyes Fluid, Sanizal etc..
Paul |