Solder stencil helpl please

Tom_Tom · 2018-12-16T09:22:53.000Z

Lexel:

and if its not a electical part like the betzel i could use one out of machined lead

No you could not. You seem to just make things up to suit your own internal dialogue.

Also, page 20:

“6. Lead as an alloying element in steel containing up to 0.35% lead by weight,
aluminium containing up to 0.4% lead by weight and as a copper alloy
containing up to 4% lead by weight
Lead is often used as an alloying element to obtain specific properties of a metal
alloy. This exemption applies to the use of lead in steel up to 0.35% by weight, in
aluminium up to 0.4% by weight and in copper alloys up to 4% by weight. In the
context of this exemption, ‘percentage by weight’ has to be interpreted as ‘the
percentage of lead per homogeneous material per discreet part’. For example, if the
steel housing of a computer consists of two separate parts, each part can contain up
to 0.35% lead by weight of that part. ”

Tally-ho · 2018-12-16T10:12:58.000Z

OK we get it now, thank you Tom Tom.

Tom_Tom · 2018-12-16T11:40:12.000Z

Tally-ho:

OK we get it now, thank you Tom Tom.

Yes, we used to have tetra-ethyl lead in petrol, and lead water pipes.

Plumbing. The Romans invented it then boiled up their wine in lead vessels, creating lead acetate. Then drank the sweet stuff and went mad.

Not so much, any more.

It is nasty stuff, with no redeeming properties (except for very specialised hi-rel applications)

Get with the programme and eliminate it.

Lexel · 2018-12-16T13:22:48.000Z

In parts like Aluminum or steel it totally makes sense to restrict lead, as often those parts come in skin contact, or can wear off creating dust

I am working with solder on my job for over 20 years now and I have tried the best silver lead free you can buy, its simply a pain to solder with it

Companies optimised leaded solder componds not because lead is cheap, they did because the physical properties are way better than with a bare tin solder

Only in the food industry like wine or spirits destilling ect. Lead free solder is used because you would poison the liquid otherwise

Reflowing LEDs you are with lead free on the point where you can easily overcook the emitter as the reflow between 200 and 240 degree has only a very short time you can stay that hot, low temperature solder melts at too low temperature for hard driven LEDs, and I doubt flashlight companies tried to create a new lead free compound melting at 180degree with eutectic melting point

There are more and more exceptions like military, medical or car industry which are allowed to use leaded solder, because it has simply superior physical properties make it more durable and reliable under extreme conditions or do you want to die because your breathing machine fails because some lead free solder connection wents cold or breaks?

Same for electronic parts that cant be produced without too much Cadmium for example, they simply get an ROHS exception

led4power · 2018-12-16T15:26:30.000Z

Tom Tom is right, lead is banned in most of the World, period. And yes, basically all commercial electronic manufacturers use lead-free solder, so claim that "most flashlight manufacturers use Pb solder" is pure BS propaganda.

I'm using only lead free solder for 2+years and had zero problems, and you can feel it's more thermally conductive while using PB-free soldering wire.

So in LED world it's superior to leaded solder, yes, lead solder flows more nicely and has nice shiny appearance, but with good lead free solder there is almost no difference in use.

It's sad to hear anyone is defending toxic material just because he/she doesn't know how to use lead-free solder properly and spend some money to buy decent lead-free solder with 3% silver content and good flux.

Lexel · 2018-12-16T16:22:58.000Z

led4power:

Tom Tom is right, lead is banned in most of the World, period. And yes, basically all commercial electronic manufacturers use lead-free solder, so claim that “most flashlight manufacturers use Pb solder” is pure BS propaganda.

I’m using only lead free solder for 2+years and had zero problems, and you can feel it’s more thermally conductive while using PB-free soldering wire.

So in LED world it’s superior to leaded solder, yes, lead solder flows more nicely and has nice shiny appearance, but with good lead free solder there is almost no difference in use.

It’s sad to hear anyone is defending toxic material just because he/she doesn’t know how to use lead-free solder properly and spend some money to buy decent lead-free solder with 3% silver content and good flux.

I wrote I discovered many manufactorieries of Chineese flashlights use leaded solder to reflow the LEDs

I had the good stuff with 3% silver and good flux for 50€ a 1000g, simply it was not nearly as good as the stuff with lead and 2% silver or copper used before

and yes its superior especially in non commercial use like we do

- melting about 25°C earlier than lead free especially if you dont own a high tec reflow oven

flows better under the LED covering more area of the pads, doesnt help the lead free conducts better while it covers less area

LouieAtienza · 2018-12-16T16:39:26.000Z

Tom Tom:

Tally-ho:

OK we get it now, thank you Tom Tom.

Yes, we used to have tetra-ethyl lead in petrol, and lead water pipes.

Plumbing. The Romans invented it then boiled up their wine in lead vessels, creating lead acetate. Then drank the sweet stuff and went mad.

Not so much, any more.

It is nasty stuff, with no redeeming properties (except for very specialised hi-rel applications)

Get with the programme and eliminate it.

In all fairness I think though with all the more dangerous stuff lurking within a flashlight - like the lithium batteries - and the production, including aluminum (aluminium for the EU guys) and its anodizing process, lubricants and coolants used in the CNC machinery and the fuel for the electrical plants that supply the energy for those machines (and they’re not using nuclear in China), the micro amounts of lead in solder in a flashlight in comparison far pales all the other potentially harmful substances and effects of them. This is akin to noticing the speck in someone’s eye when we have a log in our own. Sure, we know how to properly dispose of batteries, but not everyone in the buying public does… so do we worry about .2 grams of lead when eight Li-ion cells get thrown in the trash?

led4power · 2018-12-16T17:02:10.000Z

Lexel:

I wrote I discovered many manufactorieries of Chineese flashlights use leaded solder to reflow the LEDs I had the good stuff with 3% silver and good flux for 50€ a 1000g, simply it was not nearly as good as the stuff with lead and 2% silver or copper used before and yes its superior especially in non commercial use like we do - melting about 25°C earlier than lead free especially if you dont own a high tec reflow oven - flows better under the LED covering more area of the pads, doesnt help the lead free conducts better while it covers less area

1.Please name those many manufacturers, and show proof that they use lead solder,

2. I said PB-free is superior for LEDs because of higher thermal conductivity. Your claim about lead free solder not flowing well may be true for some junk boards (without gold plating or dirty) or solder pastes, but with good boards and solder paste there is absolutely no problem and area coverage is the same as with lead solder. 25C higher temp is not problem, all LEDs are designed to handle it.

If lead-free solder is so much problematic as you claim, we wouldn't have smartphones,laptops etc. today, because defect rate would be high with all those 1000pin BGA and other super tiny chips, if lead-free solder doesn't flow well.

Lexel · 2018-12-16T18:51:23.000Z

led4power:

Lexel:

I wrote I discovered many manufactorieries of Chineese flashlights use leaded solder to reflow the LEDs I had the good stuff with 3% silver and good flux for 50€ a 1000g, simply it was not nearly as good as the stuff with lead and 2% silver or copper used before and yes its superior especially in non commercial use like we do - melting about 25°C earlier than lead free especially if you dont own a high tec reflow oven - flows better under the LED covering more area of the pads, doesnt help the lead free conducts better while it covers less area

1.Please name those many manufacturers, and show proof that they use lead solder,

2. I said PB-free is superior for LEDs because of higher thermal conductivity. Your claim about lead free solder not flowing well may be true for some junk boards (without gold plating or dirty) or solder pastes, but with good boards and solder paste there is absolutely no problem and area coverage is the same as with lead solder. 25C higher temp is not problem, all LEDs are designed to handle it.

If lead-free solder is so much problematic as you claim, we wouldn’t have smartphones,laptops etc. today, because defect rate would be high with all those 1000pin BGA and other super tiny chips, if lead-free solder doesn’t flow well.

Too bad I had no pictures made from for example XHP70 LEDs I removed while the tin was in half solid state
both the LED bottom and the MCPCB thermal pad was literally swiss cheese
The thing stripping the LED in a half solid state is simply not going near the 240°C limit of all those LEDs,
but as I wrote on the majority of LEDs I replace in stock chineese lights were with suspicious leaded solder tempererature stripped

or 2 XHPs 35s from a big company which had literally only 5% of the thermal pad with a connection to ther thermal pad, and LEDs went almost instantly blue and overcoocked themself

Its not fair to name here the brands but about 50% of the chineese, also including top end priced ones had 180°C melting solder

So if we talk about waste, if 1 million flashlights with leaded soldered 3535 LEDs get thrown in the household trash does this cover the one car battery get thrown in it or not by weight?
The main reason for ROHS was the waste problem of all those electronic devices not that its a real hazard for humans while using it

In fact the main problem is this electronic trash not getting properly recycled, because its cheaper to send it as used working electronics to India or Africa,
where kids spread hazardous materials all over the place and burn away the insulation to get to the copper
ROHS cant protect from inproper recycled metal of electronic devices in such cases, the other burning things are way more of a problem than a tiny amount of lead

RobertB · 2018-12-16T17:33:02.000Z

LouieAtienza:

Sure, we know how to properly dispose of batteries, but not everyone in the buying public does… so do we worry about .2 grams of lead when eight Li-ion cells get thrown in the trash?

” According to the U.S. government, lithium ion batteries aren’t an environmental hazard. “Lithium Ion batteries are classified by the federal government as non-hazardous waste and are safe for disposal in the normal municipal waste stream,” says Kate Krebs at the National Recycling Coalition. While other types of batteries include toxic metals such as cadmium, the metals in lithium ion batteries - cobalt, copper, nickel and iron - are considered safe for landfills or incinerators (Interestingly enough, lithium ion batteries contain an ionic form of lithium but no lithium metal ”

teacher · 2018-12-16T17:56:35.000Z

LouieAtienza:

In all fairness I think though with all the more dangerous stuff lurking within a flashlight - like the lithium batteries - and the production, including aluminum (aluminium for the EU guys) and its anodizing process, lubricants and coolants used in the CNC machinery and the fuel for the electrical plants that supply the energy for those machines (and they’re not using nuclear in China), the micro amounts of lead in solder in a flashlight in comparison far pales all the other potentially harmful substances and effects of them. This is akin to noticing the speck in someone’s eye when we have a log in our own. Sure, we know how to properly dispose of batteries, but not everyone in the buying public does… so do we worry about .2 grams of lead when eight Li-ion cells get thrown in the trash?

I agree LouieAtienza, well said. :+1:
Common sense is sometimes not a strong suit of the people who make these laws. :person_facepalming:

Tom_Tom · 2018-12-17T04:42:08.000Z

Lexel, I totally agree that traditional lead solders have some superior properties, and are much easier to work with, for the amateur.

Which is where I started here, encouraging amateur hobbyists to stock up on “the good stuff” whilst you still can, and use it.

Once this is taken seriously, demand for leaded solder will dry up, along with availability. Once the USA jumps on the bandwagon, it will be gone.

The early lead-free materials were dreadful.

However things have changed. Study Restriction of Hazardous Substances Directive - Wikipedia and read the last paragraphs, which are cause for optimism.

Nevertheless, the EU bureaucrats, decided to ban it’s use in EEE many years ago, except with specific exemptions. Which are under continuous review, and all expire after 5 years, if not renewed. And new ones are very reluctantly, if ever, granted.

It is the law here, no matter what your personal opinion of it is.

China also has it’s own RoHS regulations.

en.wikipedia.org

China RoHS

China RoHS (Restriction of Hazardous Substances), officially known as Administrative Measure on the Control of Pollution Caused by Electronic Information Products is a Chinese government regulation to control certain materials, including lead. The Ministry of Industry and Information Technology (MIIT) of China is responsible for approval and publication of China's RoHS regulations. "Administration on the Control of Pollution Caused by Electronic Information Products" (ACPEIP or China RoHS I) was...

The concern is nothing to do with poisoning the user, it is what happens when the EEE is disposed of at end of life. Now all WEEE is supposed to be specifically recycled and the materials re-used, but that doesn’t actually happen.

In practice, 70% of the word’s WEEE still ends up in China for processing, and they are fed up with it. Importation of it has been banned for many years, but it is still smuggled in on a massive scale. It is no longer seen as a valuable resource, but as a severe environmental problem. China domestically is also the second largest producer of WEEE, after the USA.

en.wikipedia.org

Electronic waste in China

Electronic waste or e-waste in China refers to electronic products that are no longer usable and are therefore dumped or recycled. China is the world's largest importer and producer of electronic waste with over 70% of all global e-waste ending up in the world's largest dumpsites. An estimated 60–80% of this e-waste is handled through illegal informal recycling processes, without the necessary safety precautions legally required by Chinese government regulations. Processing e-waste in China's dom...

If nothing else, follow this link. A gram here, a gram there, all adds up. Out of sight, out of mind, not my problem, is not an ethical philosophy.

Every UK citizen is estimated to produce 3.3 tonnes of WEEE in a lifetime. All of which has to be disposed of sensibly. Eliminating the lead, and other banned substances, is part of that process.

Just as eliminating it from petrol was. And from paint. That met with great resistance and lobbying from industry at the time, but who would argue for it’s re-introduction today ? (except for vintage car and aeroplane enthusiasts, who can still get Avgas). Likewise installing 3 way catalysts.

And eliminating SO2 from power station exhausts ( remember Waldsterben ? ). Although you are burning the filthiest brown lignite coal now, and even more Russian gas, since Merkel turned off all your clean nuclear stations. Some corruption involved there ? Just a thought, lots of money to be made digging up coal and supplying gas. And “lobbying” works. Nord Stream 2, and Gerhard Schröder’s involvement for example. But I digress.

Currently also seeing the death of Diesel, largely due to blatant lies and cheating by German manufacturers, who have been found out. Don’t be one of those, using leaded solder where it’s not allowed.

https://en.wikipedia.org/wiki/File:WEEE_Man,*Eden_Project*~~*geograph.org.uk*~~\_785381.jpg

Tom_Tom · 2018-12-17T05:17:44.000Z

teacher:

LouieAtienza:

In all fairness I think though with all the more dangerous stuff lurking within a flashlight - like the lithium batteries - and the production, including aluminum (aluminium for the EU guys) and its anodizing process, lubricants and coolants used in the CNC machinery and the fuel for the electrical plants that supply the energy for those machines (and they’re not using nuclear in China), the micro amounts of lead in solder in a flashlight in comparison far pales all the other potentially harmful substances and effects of them. This is akin to noticing the speck in someone’s eye when we have a log in our own. Sure, we know how to properly dispose of batteries, but not everyone in the buying public does… so do we worry about .2 grams of lead when eight Li-ion cells get thrown in the trash?

I agree LouieAtienza, well said. :+1:
Common sense is sometimes not a strong suit of the people who make these laws. :person_facepalming:

I totally disagree. Common sense seems not to be a strong suit of some vocal forum “pundits” who have not the first clue about the subject.

Every industrial process is tightly regulated in the EU, and the US, and disposal/recycling of contaminated materials is a huge part of the work. You can’t just flush stuff down the drain, landfill, or send it up the chimney any-more.

Batteries is a good one, we have an EU directive on that too, which was not just drafted by some Brussels bureaucrat with an Arts degree, but after wide consultation with some very resistant industry specialists.

en.wikipedia.org

Battery Directive

The Directive 2006/66/EC of the European Parliament and of the Council of 6 September 2006 on batteries and accumulators and waste batteries and accumulators and repealing Directive 91/157/EEC, commonly known as the Battery Directive, regulates the manufacture and disposal of batteries in the European Union with the aim of "improving the environmental performance of batteries and accumulators".: 4 Batteries commonly contain hazardous elements such as mercury, cadmium, and lead, which when in...

Lead was even banned in wheel-weights many years ago. Annoying for me, because they were my primary source for casting lead bullets.

Likewise Germany banned it’s use in bullets for a while, but that got repealed after a very unfortunate boar hunting accident, where a copper bullet ricocheted off a tree trunk, instead of expanding, and killed someone.

UK Forestry Commision banned lead-based bullets for stalkers on their land many years ago.

We banned lead from shotgun cartridges used over wetland many years ago, as did the USA. I only use steel for everything now, and it works just fine, but differently.

The idea of shooting 25 or 50 cartridges, each containing an ounce or so of lead shot, maybe also a plastic wad, per person, at my informal shoot (15 to 20 of us), every two weeks, is abhorrent, which is why, after discussion, we all decided to stop using it. Club rule.

This is over land that cattle graze, and are then eaten by humans.

It also puts us on a more level playing field, where those who can afford the best cartridges no longer have an advantage. We all use the same, steel, fibre wad, which we bulk-buy to special order, and save a lot of money.

Tom_Tom · 2018-12-17T05:35:37.000Z

LouieAtienza:

… and the fuel for the electrical plants that supply the energy for those machines (and they’re not using nuclear in China),

Educate yourself.

en.wikipedia.org

Nuclear power in China

China is one of the world's largest producers of nuclear power. The country ranks third in the world both in total nuclear power capacity installed and electricity generated, accounting for around one tenth of global nuclear power generated. As of February 2023, China has 55 plants with 57GW in operation, 22 under construction with 24 GW and more than 70 planned with 88GW. About 5% of electricity in the country is due to nuclear energy. These plants generated 417 TWh of electricity in 2022 Nuc...

“China ranks fourth in the world in total nuclear power capacity installed, and third by nuclear power generated.”

They have a massive nuclear power infrastructure, are in a joint-venture with France to build the UK’s next one, then roll out their own ones here, once they pass our strict certification.

Our select specialist nuclear engineering degree and post-graduate courses also often involve secondment to China and from China, up to 6 months, for students, to mutual benefit and understanding. They know a lot about nuclear engineering, and other hi-tech stuff.

Making cheap torches is not really a mainstay of their economy. The clever engineers work on much more interesting things.

LouieAtienza · 2018-12-17T05:46:16.000Z

Tom Tom:

Making cheap torches is not really a mainstay of their economy. The clever engineers work on much more interesting things.

Exactly. So if flashlights are such a tiny part of their economy, and so few folks are using leaded solder nowadays, it’s use should be insignificant enough when compared to the dangers of Li-ion batteries, and pollutants from the manufacturing process.

Tom Tom:

“China ranks fourth in the world in total nuclear power capacity installed, and third by nuclear power generated.”

Educate yourself. Before making crude remarks and bogus Wiki references.

*_80_* of China’s energy consumption come from coal and crude oil. As massive as their nuclear infrastructure is, it, along with hydro and wind, combine for only 13 of China’s energy consumption.

Statista

China: energy consumption breakdown by source | Statista

In 2020, coal accounted for 56.8 percent of total energy consumption in China.

teacher · 2018-12-17T18:08:27.000Z

Tom Tom:

teacher:

LouieAtienza:

In all fairness I think though with all the more dangerous stuff lurking within a flashlight - like the lithium batteries - and the production, including aluminum (aluminium for the EU guys) and its anodizing process, lubricants and coolants used in the CNC machinery and the fuel for the electrical plants that supply the energy for those machines (and they’re not using nuclear in China), the micro amounts of lead in solder in a flashlight in comparison far pales all the other potentially harmful substances and effects of them. This is akin to noticing the speck in someone’s eye when we have a log in our own. Sure, we know how to properly dispose of batteries, but not everyone in the buying public does… so do we worry about .2 grams of lead when eight Li-ion cells get thrown in the trash?

I agree LouieAtienza, well said. :+1:
Common sense is sometimes not a strong suit of the people who make these laws. :person_facepalming:

I totally disagree. Common sense seems not to be a strong suit of some vocal forum “pundits” who have not the first clue about the subject.

Every industrial process is tightly regulated in the EU, and the US, and disposal/recycling of contaminated materials is a huge part of the work. You can’t just flush stuff down the drain, landfill, or send it up the chimney any-more.

Batteries is a good one, we have an EU directive on that too, which was not just drafted by some Brussels bureaucrat with an Arts degree, but after wide consultation with some very resistant industry specialists.

Battery Directive - Wikipedia

Lead was even banned in wheel-weights many years ago. Annoying for me, because they were my primary source for casting lead bullets.

Likewise Germany banned it’s use in bullets for a while, but that got repealed after a very unfortunate boar hunting accident, where a copper bullet ricocheted off a tree trunk, instead of expanding, and killed someone.

UK Forestry Commision banned lead-based bullets for stalkers on their land many years ago.

We banned lead from shotgun cartridges used over wetland many years ago, as did the USA. I only use steel for everything now, and it works just fine, but differently.

The idea of shooting 25 or 50 cartridges, each containing an ounce or so of lead shot, maybe also a plastic wad, per person, at my informal shoot (15 to 20 of us), every two weeks, is abhorrent, which is why, after discussion, we all decided to stop using it. Club rule.

This is over land that cattle graze, and are then eaten by humans.

It also puts us on a more level playing field, where those who can afford the best cartridges no longer have an advantage. We all use the same, steel, fibre wad, which we bulk-buy to special order, and save a lot of money.

Exactly… the things you mention are great examples where “common sense” was actually used.

Banning lead solder use in a flashlight is completely devoid of “common sense”…. as far as I am concerned.

Agreed…‘Common sense’ certainly does seems not to be a strong suit of some vocal “forum ”pundits” “. Some even grossly overestimate the true value of their commentaries.

.
edit for spelling correction.

CRX · 2018-12-17T18:03:18.000Z

True

Tom_Tom · 2018-12-18T00:27:10.000Z

LouieAtienza:

Educate yourself. Before making crude remarks and bogus Wiki references.

*_80_* of China’s energy consumption come from coal and crude oil. As massive as their nuclear infrastructure is, it, along with hydro and wind, combine for only 13 of China’s energy consumption.

China: energy consumption breakdown by source | Statista

Again I remind you that you are the one who said “(and they’re not using nuclear in China)”. Which couldn’t be further from the truth. So I politely corrected you. But now you seem determined to turn this into some sort of China bashing rant, but you can’t even get your facts right, and just won’t let it lie.

China is little different from the USA, which also uses fossil fuel for nearly 80% of it’s energy production.

Here is a reference that is anything but “bogus”:

https://www.eia.gov/energyexplained/?page=us_energy_home

“The three major fossil fuels—petroleum, natural gas, and coal—combined accounted for about 77.6% of the U.S. primary energy production in 2017:
Natural gas—31.8%
Petroleum (crude oil and natural gas plant liquids)—28.0%
Coal—17.8%
Renewable energy—12.7%
Nuclear electric power—9.6%”

The USA hasn’t built a new nuclear station for 30 years, apart from two AP1000s under construction (another two have already been abandoned), but their manufacturer Westinghouse has filed for bankruptcy, their completion is uncertain, and it has recently reneged on it’s plans to build three more in the UK (Moorside Cumbria), to huge embarrassment. Civil nuclear in the USA is not in good shape, and your existing stations are getting old.

en.wikipedia.org

AP1000

The AP1000 is a nuclear power plant designed and sold by Westinghouse Electric Company. The plant is a pressurized water reactor with improved use of passive nuclear safety and many design features intended to lower its capital cost and improve its economics. The design traces its history to the System 80 design, which was produced in various locations around the world. Further development of the System 80 initially led to the AP600 concept, with a smaller 600 to 700 MWe output, but this saw l...

“Two AP1000 reactors are being built in the United States at Vogtle (Units 3 & 4)[47]. Two units were also being constructed at VC Summer (Units 2 & 3)[48], but construction was abandoned in July 2017 (4 years after starting construction) due to Westinghouse’s recent bankruptcy, major cost overruns, significant delays, and other issues.[49] Although the project’s primary shareholder (SCANA) had determined that completing Unit 2 while only abandoning Unit 3 was a financially feasible and internally favored alternative to abandoning the entire project, this was dependent on their minority shareholder (Santee Cooper) agreeing. Due to Santee Cooper’s board voted to cease all construction and SCANA’s inability to find another shareholder to take Santee Cooper’s place, SCANA was forced to revert to abandoning the entire project.

All four reactors were identical and the two projects ran in parallel, with the first two reactors (Vogtle 3 and Summer 2) planned to be commissioned in 2019 and the remaining two (Vogtle 4 and Summer 3) in 2020.[50][51] After Westinghouse filed for bankruptcy protection on March 29, 2017 the construction has stalled.”

Whereas:

“In 2012, China had 15 nuclear power units with a total electric capacity of 11 GW and total output of 54.8 billion kWh, accounting for 1.9% country’s total electricity output. This rose to 17 reactors in 2013. By 2016 the number of operating nuclear reactors was 32 with 22 under construction and other dozen to start construction this year. There are plans to increase nuclear power capacity and nuclear power percentage, bringing the total electricity output to 86 GW and 4% respectively by 2020.[48] Plans are to increase this to 200 GWe by 2030, and 400 GWe by 2050. China has set an end-of-the-Century goal 1500GWs of nuclear energy, most of this from fast reactors. China has 32[49] reactors under construction, the highest number in the world.”

en.wikipedia.org

Energy policy of China

China is both the world's largest energy consumer and the largest industrial country, and ensuring adequate energy supply to sustain economic growth has been a core concern of the Chinese Government since the founding of the People's Republic of China in 1949. Since the country's industrialization in the 1960s, China is currently the world's largest emitter of greenhouse gases, and coal in China is a major cause of global warming. However, from 2010 to 2015 China reduced energy consumption Bei...

Now, please can we return to solder stencils, their use, and the selection of materials to use with them, in accordance with the letter and spirit of the laws applying in the regions where they are to be used.

Tom_Tom · 2018-12-18T00:59:10.000Z

teacher:

Banning lead solder use in a flashlight is completely devoid of “common sense”…. as far as I am concerned.

What seems like “common sense” to one person, may seem like nonsense to another person, perhaps more clued up on the wider picture.

The legislation exists for good reasons, it wasn’t just dreamed up as a “bright idea” one day, industry was consulted and has responded, even found new materials to be superior, it is the norm nowadays (as well as the law).

Back to my first point: you can still buy leaded solder, for now, and use it as an amateur hobbyist, or to repair pre-2006 stuff. But if you manufacture things for sale, no matter how small your business, it is illegal to use it (except under certain precisely defined exemptions, which are mostly expected to be withdrawn within 5 years or so, as industry develops improved compliant processes).

LouieAtienza · 2018-12-18T04:05:30.000Z

Tom Tom:

Again I remind you that you are the one who said “(and they’re not using nuclear in China)”. Which couldn’t be further from the truth. So I politely corrected you. But now you seem determined to turn this into some sort of China bashing rant, but you can’t even get your facts right, and just won’t let it lie.

I’m not big on emojis, but I thought I was pretty clear that I was being facetious with that comment. Telling someone to “educate themselves” is far from being polite; it implies that person is somehow uneducated. Alas meanings get lost when we cannot determine facial expressions or hand gestures (context). I agree whole-heartedly that we should be good stewards of the earth; I just felt you made it seem like China is one of the bastions of environmental care, when it ranks among the top 13 countries with the most polluted urban areas. (The US by the way ranks in the top 12 least polluted urban areas.) Being from the US I defend my country so I hope you understand my objection to others who “scold” us online about pollution when we’re not even close to the largest perpetrators.

Back to the topic on hand… A while back I attempted to make stencils for some prototype circuit boards I made - by actually milling out blank PCBs on my CNC. I wasn’t as successful milling a stencil, but I did find “cutting” the solder paste down (with whatever flux I had on-hand at the time) a tad helped achieve better results. Then again, the solder “pads” were a lot larger than those used on flashlight PCBs. I also did this with a CNC router which wasn’t the tightest tolerance machine, though a couple years ago I built a CNC mill with ground ballscrews and a metalworking electric spindle that probably would give far more accurate results.