Here is a list of all the postings Martin Dowing has made in our forums. Click on a thread name to jump to the thread.
|Thread: Removing Aluminium From a Cutter|
Sodium Hydroxide solution (Caustic soda) is the best to get rid of Al deposits. Does not react with TiN, if in Doubt place undamaged TiN coated item in it.
I am using caustic soda for standard treatment of Al clogged files. They need fast rinse with water, then isopropanol and then very slight oiling with WD40 afterwards to prevent rusting.
|Thread: Phone Scam|
Don't worry. At some point someone will give away *your* details too.
I am afraid one day it will be for real. Bankrupting government can try anything, even invent unpaid taxes.
|Thread: Department of Work and Pensions|
25 years ago I have realized that money transferred to finnancial institution as "savings" are in fact money stuffed into dog ass.
So no bank savings, no life insurance, no private pension etc.
Paid attention to investment in business, land, property, private investments in shares etc. Hopefully it will keep its value.
My son have made a little fortune out of crypto. He is a skilled shorter.
PS. Should get partial state pension due to "lenght of service" but if state have elected to default and cheat me I don't care. Come in - nice, if not - can do without.
Edited By Martin Dowing on 23/04/2018 09:12:32
|Thread: Silver steel|
Your steel might be delivered in annealed form or you may purchase it as such. Otherwise heat it to about 800*C in molten salt bath (NaCl/KCl), cool down *slowly*, wash with water and dry.
Wind a spring, heat it to 760-800*C, best in furnace or molten salt (KCl/NaCl) bath and austemper it, eg quench into molten sodium or potassium nitrate bath at 300*C bath themperature.
Keep at 300*C for 30 minutes more, take out, cool and wash with water.
|Thread: Home workshop fatal tragedy|
From practical point of view it is rather difficult to produce sufficient amount of hydrogen to cause a reasonable explosion without deliberately collecting it somehow.
Approximately 2 x 96500 C (say 200000 C) of electricity would be fequired to produce 1 mole (22.4 L) of hydrogen (H2) gas at 1at/RT.
To blow up a shed in a spectacular way as reported by neighbours at least 100L of hydrogen would be needed and this would need to be generated fast enough to prevent dispersion.
To get there you would need about 1-2 hours of work of 200A power supply, depending of exact setup and well sealed shed to prevent hydrogen loss to outside.
In well aerated shed you would probably look for 1000 A power supply - unlikely at amateur disposal.
Conclusion: Hydrogen was deliberately collected and something went wrong. Possibly it was not separated good enough from oxygen produced on anode... and a burner was tried or cigarette lighted on etc.
|Thread: Plastic Ban|
Hi, I also live in EE (Poland) for sometime and in our local area they have a nice recycling policy.
Local authorities are encouraging residents to segregate plastic by offering 50% discount for refuge collection.
Many of residents are doing it. Then bin men are coming and taking segregated bin only to mix them in the landfill again. Local chancellor is officially happy because EU quotas are satisfied and authority does not pay fines for underrecycling but in private she would admit that entire exercise is a nonsense. There are some hopes that we will be sending it to Ukraine where it is used as a fuel. These are good news but not for Ukraine.
|Thread: Cutting a dovetail|
Read Harold Hall's milling tutorials for good idea how to do it.
In general make first square slot, then finish it off with dovetail cutter in few passes from each side. Make both sides in one setting to ensure good degree of parallelity, which is usually not too critical anyway as a gib strip will take care of it.
If it need to work really smooth, you will need to scrap it at the end and that is not easy.
|Thread: Home workshop fatal tragedy|
Regarding Hydrogen Economy.
From my life long experience as a research chemist and in depth understanding of the subject - it has no future and it is going to be more expensive than alternatives, including batteries.
Small amounts of hydrogen might be produced during chemical processing including waste processing and used locally small scale but using electrolysis to produce hydrogen for ICE on a large scale is just stupid.
Cheaper is to charge battery with available electricity and adequate tech is already there.
Regarding HOH "wonder gas" - just fraud to milk cash of stupid.
Hydrogen is great for manufacturing chemicals like ammonia but thats about all. It is a very good fuel but only for Apollo missions or a shuttle.
Numerous projects to develop it as a general fuel are around only because government (or taxpayer) money are freely available to waste.
Edited By Martin Dowing on 22/04/2018 18:43:02
Hydrogen is better heat conductor because it has smaller molecule and much higher velocity of molecules than air components like oxygen or nitrogen do under the same p/T conditions.
For the same reason argon and even more so heavier noble gases are good heat insulators - slower mooving molecules.
It is even easier to produce hydrogen by dropping a piece of aluminium to caustic soda solution. This way you can produce it up to any reasonable pressure, eg 200at if done under proper enclosure, eg in empty gas cylinder. Make sure you know what you are doing while attempting that because you may end up like this unlucky chap.
Btw, neighbours of the guy who were talking about something like "nuclear explosion" obviously didn't see one.
|Thread: Plastic Ban|
Buy 100 packets, bar your wife from touching them (if you have a wife) and you have got life long supply. They are cheap enough.
Engineering is an art of compromise. Surely we *can* manufacture packaging materials of sufficienty low environmental impact and degradable fast enough not to bother us. Technology *is* there.
Solution for electrosh*t on the other hand could take a form of compulsory manufacturer warranty for 5 or 10 years to legislate out cheap disposable crap. I have TV 30 years old (Sony Black Trinitron). Quality of reception still beats many modern plasmas and LCDs. It have *never* seen service albeit on 1 occassion I have replaced a fuse myself.
I have also several warm light energy saving compact fluorescent bulbs made 20 years ago. They were 10 queeds each at the time but maybe 2 of 20 are blown by now. Current versions won't last more than a year or two.
Your maths is off by approximately 1 order of magnitude. More like 0.3 per person per day.
If they want to attack plastic problem, the first place to look at is food packaging industry. For example by setting a standard stating that no more than 0.01% of brutto weight of food can be a plastic.
Return to glass bottles for drinks and force shops by law to accept returns for money deposit. Oblige shops to accept returns without proof of purchase from a given shop. Set a price of bottle high enough to make sure that 95% of consumers pay attention to its value and set final price paid by drink manufacturer for recycled bottle high enough that shops are making profit too. If cheaper to manufacture new than collect recycled, tax new bottles until making new is more expensive. Make unified standard for soft drink bottle, wine bottle etc so they are easy to refill by any manufacturer. The same for jam jars and other common packaging. Permit aluminium for light weight "convenient" drink packaging. It corrodes fast enough and already there is a good incentive to recycle anyway.
Make an exception for biodegradable plastics, eg those easy digestible by microorganisms with environmental halflife less than 6 months or so.
Bans on toothpicks or cotton buds are lipstick on pig but in an era of reign of stupid everything is possible. I wonder when they will legislate in paper condoms.
Edited By Martin Dowing on 22/04/2018 06:58:06
Edited By Martin Dowing on 22/04/2018 07:03:10
|Thread: Wind turbines get bigger and bigger|
Richard, I disagree with you. You are writting how things *should* work, unfortunately they are working entirely different and we are no longer living in capitalism.
Subsidies are extremely important for businesses now because they are one of last remaining lifelines for them.
So lets beging with our Western banking sector.
Do you really believe that it would still exist in current form without *subsidies* from taxpayer following Lehmann Brothers collapse?
Now look on all these European projects. There are subsidies, EU funds everywhere. Any green, less green and not green at all but politically well connected entity will get EU subsidies for some esoteric green projects.
The same holds true with entities promising innovation. There are countless subsidies there, owners and managers are getting rich enough to buy mansions, luxurious cars and porn star girlfriends but hardly any innovations are coming out of that. One time I wanted to buy an item from engineering company which is thriving on subsidies. Purchasing procedure was so complex that I have realized that I have incurred more cost on this company than any possible profit they could make by selling me ordered item. I have asked manager over the phone why it is so and he was surprisingly honest. I was advised that they are living off EU subsidies, they may not sell anything at all as long as they are keeping up with production of documents as required by Brussels and that it *is* their business model. I have asked "what then?" Answer was "Then we will be rich so we can close down or apply for grants in another project".
Doing business in an honest way is long time gone. Now we are left with fraud, ripoffs, corruption, subsidies etc. This is last show in town before lights go off.
Capitalism no longer exists.
Edited By Martin Dowing on 06/04/2018 22:25:11
|Thread: How to paint aluminium|
Many thanks for suggestions.
I have purchased spray etchant in specialistic shop supplying car repair businesses. Seller is very confident about its performance.
Yes, it is sometimes good idea to search older threads.
I have made of aluminium quite nice switchbox dedicated for motor control.
How to paint it? It is known that most of paints do not stick to aluminium and anodizing means much troubles. Chemistry is easy enough but I really want to avoid troubles related to purchasing appropriate chemicals and making appropriate bath, all just to make an odd item looking nice.
So any paints which will stick to aluminum well?
|Thread: Trade wars and this hobby|
For those who believe in Sandvik carbide tools/inserts are made in Europe mythology here is an interesting reading:
Don't forget to check the date of this release...
Edited By Martin Dowing on 05/04/2018 20:26:09
You often don't even know what you are buying. On many occassions you are convinced that you are buying UK goods only to get Far Eastern/Romanian/Bulgarian imports.
I have ML7 lathe so buying spares for it from Myford (Mytholmroyd) or RDG should imply that I am buying UK production. Yet I am quite convinced that custom made Far Eastern or Eastern European imports are usually delivered and all what is done in UK is label sticking and packaging. Quality is often questionable as well, perhaps because cheapest (and crapest) Far Eastern manufacturers are selected and their price still bargained down as much as possible.
Another thing is that for items like carbide inserts, torx screws, boring heads, broaching sets, ACME taps and many others I will not overpay 3-50 fold to keep bureaucrats happier, welfare m(b)ums even fatter and lazier and for immigrants to get more benefits.
By buying it in UK you are usually *not* supporting local manufacturer only cheeky trader who imports it, sometimes sticks "made in UK/EU" label on, rips you off and laugh all the way to bank. If not that it will ofen be a corpo with production facilities in China and some of managers and accountants located here. That is what "made in UK/EU" usually means these days.
For those abhorrified about possible tax evasion:
You can buy carbide inserts £ 0.2 each via Banggood from Netherlands stores and diamond coated grinding discs worth 4 packets of peanuts, countless other similar products all of superb quality. So EU duties paid, all done lege artis and pimps may p**s off.
DMB & others,
I am not a fan of EU at all. In the past it was great as free market agreement but now it is no more than troubled and failing social engineering project. The faster it goes to dustbin of history, the better. However I would still support former formula, eg free trade agreement.
One way or another countries belonging to so called Western civilization must realize that they no longer have a global influence like used to be in the past. They have constructed defunct socialist/liberal systems no longer competitive on global scene. At the moment it is only a threat of military force, which prevents other nations from grabbing most of wealth and influence but superiority of this military force is already questioned. It was easy enough to bully Iraq, Afghanistan, Libya or Serbs but really nothing lasting was achieved and a lot of money gone wasted
Syria is the first place where Americans have suffered conclusive defeat in this century, North Korea seems to be a non starter, Iran too. Relations with Turkey are turning more and more disastrous.
It seems that "democracy", "freedom", "women rights", "gay rights" or any other BS no longer can be exported elsewhere. Interests of huge foreign powers are under threat and further efforts in this direction will only result in trade wars, economic collapse and who knows, maybe even atomic war.
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