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| Old School Soldering |
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| pickle9000:
Stained glass was a major user of soldering irons 3/8 inch to 1 inch tips is normal. 120 watt iron is a pretty good size for a half inch tip. Came is the H channel material (solid lead) that the glass slips into. Old pre-electric irons where just that a copper iron in a fire you would have as many as you need to keep up with the job. It's a very old technology. |
| helius:
Copper soldering irons were used in this reproduction of the 2200-year-old Antikythera Mechanism: Showing that a similar tool could have been used to make it. |
| TerraHertz:
--- Quote from: coppercone2 on January 07, 2021, 09:18:16 pm ---modern acetylene cylinders use THF instead of acetone and there is alot of safety work that went into them since there was a explosion in australia a long time ago. Some of the concerns that people have no longer apply to modern tanks, but all concerns involving gas are still the same. --- End quote --- You don't happen to know how to transfer acetylene from one tank to another? I'm curious. For propane it's easy - gravity and gas pressure in the full tank will push the liquid to the empty tank. Just a matter of fittings, tank orientation, flushing out air, etc. For general gases, oxygen, argon, CO2, MIG gas, etc, there are high pressure gas transfer pumps. Cheap from China, someday I must get one. But acetylene... I have no idea. At least of how to do it safely. Must be possible, since cylinders _are_ filled. Maybe there's some old book(s) from the early 1900's with details, before everything went liability mad. But I haven't found them yet. It's not such a pressing need, now one can buy gas cylinders outright again. Thank God. Years ago I swore I'd never again get sucked into the cylinder rental scam. |
| coppercone2:
Yea I would not fuck with acetylene its cheap enough. Seriously dangerous way to try to save money. Get a portatorch with small bottles. For high pressure gasses you use higher pressure equalized tanks with flow limiting restriction and a good regulator. The distributors typically have weird gasses delivered and common gasses supplied from a gas battery. I want to say the welding store does not use a transfer pump they just have like 30 cylinders daisy chained together for distribution, the high pressure transfer happens in some professional facility. When I think of china + thousands of PSI that is bad. How do you know someone did not machine a shitty casting or something. The professional air compressors are the size of a industrial washing machine and run at like 95db+. The frames of all this stuff are built like safes with like 3/8 inch plate being the minimum. Special tech gets paid like 30+ an hour just to service em. I expect the QC for these parts to be very expensive (like a spline shaft manufacturing place). I suspect its welded together with the same standards as military vehicle armor. |
| iso:
--- Quote from: TerraHertz on January 16, 2021, 10:42:26 am --- --- Quote from: coppercone2 on January 07, 2021, 09:18:16 pm ---modern acetylene cylinders use THF instead of acetone and there is alot of safety work that went into them since there was a explosion in australia a long time ago. Some of the concerns that people have no longer apply to modern tanks, but all concerns involving gas are still the same. --- End quote --- You don't happen to know how to transfer acetylene from one tank to another? I'm curious. For propane it's easy - gravity and gas pressure in the full tank will push the liquid to the empty tank. Just a matter of fittings, tank orientation, flushing out air, etc. For general gases, oxygen, argon, CO2, MIG gas, etc, there are high pressure gas transfer pumps. Cheap from China, someday I must get one. But acetylene... I have no idea. At least of how to do it safely. Must be possible, since cylinders _are_ filled. Maybe there's some old book(s) from the early 1900's with details, before everything went liability mad. But I haven't found them yet. It's not such a pressing need, now one can buy gas cylinders outright again. Thank God. Years ago I swore I'd never again get sucked into the cylinder rental scam. --- End quote --- I transfer calibration gases at work from cylinders into passivated canisters, which are not rated for much pressure but the principle I imagine is the same. I put the receiving canister under a vacuum (if it's a calibration gas, down to ~100 mTorr, but for general gas use it doesn't need to be down that far I imagine) then attach it via a bit of stainless steel tubing (usually via a Micro-QT connector) and an appropriate regulator. I then open up the regulator slowly to the required pressure until I can't hear the gas flow anymore. I assume it'd be a similar process for transferring between two larger gas bottles. With acetylene I suspect you couldn't put the old cylinder under vacuum otherwise the saturating solvent would disappear, but maybe if you purged the air out first as you suggest... |
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