Here is a list of all the postings Anthony Knights has made in our forums. Click on a thread name to jump to the thread.
|Thread: The Workshop Progress Thread 2021|
I have now finished making enough components of the Stewart Hart beam engine to be able to fix them together to see what it looks like. (Impatient person that I am). Made a rough looking flywheel from MDF just to get some idea of dimensions when it came to making the plinth. There is still quite a bit to do, but I've already got a little guy to operate it when it's finished.
|Thread: Skynet is Coming|
It would probably be "greener" to repair it, but in these days of double sided circuit boards with minature surface mount components that I can barely see, let alone identify, it's not really possible. It's 12 years since I retired so that's an epoch in the electronics game. Well before then, I stopped taking the likes of "Practical Electronics" when most of their projects comprised a PIC and a page of code. I have to admit that towards the end of my working life, I too became a board/equipment changer, but according to my friend who is still working, the new "engineers" can't even manage that.
These super chips might be "cheap as chips" but if you try to buy a new control board for say a washing machine, you will probably find the cost is not far short of a new machine. At least with discrete components, there was a good chance of effecting a repair. (Probably why they have gone down this route, or am I just being paranoid?)
Valve TV's. Them were the days. A colour set had valves the size of jam jars, mains connected to the chassis, a lethal 25Kv final anode voltage and were a 2 man lift. How we survived without H&S I'll never know.
|Thread: Where to find a *good* optically flat mirror?|
Sheer speculation-how flat is a hard drive disk?
|Thread: Skynet is Coming|
An example of technology for the sake of it?. Yesterday I was given a defunct dehumidifier, which appeared to work, but the compressor wouldn't run. Interesting starting arrangement with the start winding in series with a positive temperature coefficient resistor. Memories of the de-gaussing coil on a shadowmask crt. There was also a fusible link in the common supply, but both appeared OK.
The fault was traced to a small PCB, whose function was to interrupt the compressor supply, when a sensor told it the condenser matrix had iced up. Found the relay and its driver transistor which in turn was controlled by a 20 pin IC. Looked up the type number and came up with the following info (I have deleted the chip type number)
I could probably replace that lot with a couple of transistors and a few resistors. Is this just a lazy designer or was he told " We've bought 1/2 a million too many. Can you get rid of them for us?"
Back in the 70's the company I worked for used to buy CCTV cameras and monitors from Japan. Every item had a user manual (more a 4 page leaflet actually) but came complete with a circuit diagram. Of course, that was back in the day when it was possible to repair stuff on site.
|Thread: Guiness world record?|
Velcro is easier than laces.
Hello Mr Pete Smith. What you need is one of these;-
My daughter bought me one, now I'm unfortunately on my own. I couldn't manage without it.
|Thread: BA threads|
Thank you peak4 for an interesting read. So we copied the 47.5 degrees and all the fault of the Swiss.
I am puzzled by the 47.5 degree angle between the flanks of BA threads. Was there some obscure mathematical reason for this value, or were the design committee split as to whether to use 47 or 48 degrees. Whatever the reason, I don't see how half a degree would make any difference one way or the other. If it was up to me, I would have chosen 48 degrees, purely on the KISS principle. 48 factorises to 3 x 2e4 and would be really easy to set up for grinding threading tools. Forgive me for asking stupid questions, but I spent my life as an electronics engineer, where one learns to think logically and learns something new every week.
|Thread: Coronavirus death stats|
Hopefully I won't now be dying from covid, although I do have other conditions which could see me off.
|Thread: New Covid Rules|
Edited By Anthony Knights on 13/01/2021 08:56:42
|Thread: Angle grinder cut off stand|
This is an Aldi cut off stand, fitted with a 115mm angle grinder. I used it a lot until I bought a "Fermi" band saw. Still used for cutting HSS blanks. It has a crappy vice arrangement, but at least has a cast iron baseplate, rather than the steel pressing that a similar machine sold by Machine Mart had.
|Thread: Humbrol Enamels|
Thank you for your replies gentlemen. I'm not bothered about any matting effect as I will be painting figures and most clothing and skin is not glossy.
I was recently given a large number of the small tins of Humbrol enamel, most of which have never been opened. On the tin it says to use Humbrol thinners. Is this a special composition, or would white spirit or some other solvent work? It has been many years since I made plastic models (moon shot) and I'm afraid I can't remember what I used back then. It is presently so cold in the workshop, I thought I would try something I can do in the house.
|Thread: A white xmas|
I woke up this morning to snow on the ground (North Yorkshire). The freezer has needed de-frosting for some time, so I bagged up the contents and dumped them outside. Then did the defrost (aided by a heat gun). Freezer is now refilled, neatly for now, but it won't last. Another round tuit job done.
|Thread: Stewart Harts Grasshopper Beam Engine|
Hi there. I am building the same engine and Stewart sent me the original plans. Does this Help?
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