|Thread: Soldering Electrical Connections to NASA standard|
Posted by Michael Gilligan on 22/04/2021 08:50:20
Posted by Ady1 on 22/04/2021 08:24:31
I couldn't find the words 'cost' 'price' or 'dollar' anywhere in that document
.It’s about the pursuit of perfection
... other documents are available if you are obsessed by those three words. MichaelG.
If you've worked for the Americans you know they produce bull***t like this all the time but never comply with it.
|Thread: Springbok liner b1 4-6-0 locomotive in 5 in gauge p|
Peter, have sent a PM on the ME articles.
|Thread: Greenwood Tools|
Posted by Martin Kyte on 03/04/2021 09:01:12
That's devastating. Greenwood was my exclusive supplier for carbide tips and drills.
Yes, a really good quality and reliable supplier.
I was not his biggest customer, but regular.
It's getting more difficult to buy from someone who can answer a question - Chronos for example just sell stuff.
|Thread: Electric Smart Meters|
Posted by Rod Ashton on 02/04/2021 07:24:28
The government should take back the whole industry. At least we would all be ripped off equally. The existing profits would surely make it a cost effective exercise.
Mmm! I've got a feeling we've been there with British Road Services, British Railways and the Coal Board to name but three.
There's only one flaw in the argument - there aint no profits when you get there.
Any government has to implement anything via civil service - a bunch of book-passing desk jockeys. No hope there methinks. The less the government is involved in anything, the better off we will be.
I do not have a smartmeter - I think I change suppliers too often to get one. I have always said yes when asked - thought it would save a pimply-faced youth from reading my meter. I do have night tariff which is switched by the Droitwich LF transmitter and works.
The facts suggested here seem to be....
Smartmeters are unique to each supplier
Currently, their only function is to give continuous usage data
People are worried they might be used for something sinister like switching their supply off
Mostly they do not work
They use the mobile phone network to transfer data
Mmm! Seems a bit of a mess?
Tongue in cheek comment - since I do not have one through no fault of my own and we are all paying, can I claim compensation? At the very least you folks should be grateful for my gift to you.
|Thread: Compressor questions|
Posted by Dave Halford on 07/03/2021 18:07:34
There used to be a 'key ring' through the centre bit back in the day and regardless of what the instructions say leave the safety valve alone. You have to pull them the same amount as 110psi+ pushes them to open the valve, then you get a100psi jet blowing at your hand which is not comfortable. Twisting it will just knacker the seal and the thing will continually leak.
At least two of the suppliers are saying the key ring on the safety valve is against EU regulations and are supplying the same compressor without the key ring! Good advice from Dave.
The Hyundai is not silent, just pretty quiet. A 50L direct-driven compressor is quoted at 97dB.
I had a Wolf belt-driven 50L and its sound level was quoted 80db.
The Hyundai is quoted 60dB.
The sound level halves every 6dB going down, so the Hyundai is as Gary says, acceptably quiet. Just one caveat, the others have 14 CFM output and the Hyundai is 11.5, but, for me, it's worth it.
You can go down to 40dB with the Bambi BB50D, but it costs nearly double and gives only 3.5CFM - but it may suit your needs!
|Thread: Would this improve the quality of signal to a CNC machine?|
Posted by Cabinet Enforcer on 27/02/2021 19:27:02:
The thing I really don't understand about audiophiles is why none of them have twigged onto the most obvious way of improving the sound experience, that being reception fidelity interoception. The simple and straightforward application of a pair of underpants to the head supplemented with correct tuned length wood and graphite frequency modifiers in the nasal cavity can take the listening experience from the sublime to the ridiculous in one fell swoop.
Difficult - I think Mr. Edmund Blackadder has the patent.
Posted by Stuart Bridger on 27/02/2021 21:00:23
The comments about made about no difference between bell wire and a quality speaker cable clearly come from those who have never heard the latter. I will happily admit to spending £40/m on cables and it was the best investment I made, with a dramatic improvement.
Maybe the poster was being just a little flippant but using thicker low-loss cables than thin bell wire can improve the listening experience. Paying £40/m is your choice and if you like the result, that's fine you can spend your cash on what you like without comment from me. Similarly, I can have an opinion for me, and for me, I think it is very poor value for money - and yes, I have tested it all out.
Posted by James Hall 3 on 27/02/2021 18:27:46
I apologise if I may have overreacted to seeing incorrect statements regarding digital signals but teaching digcomms to half a generation of undergraduates (most of whom have achieved good degrees and gone on to successful careers in R&D and industry) has made me particularly sensitive to any misconceptions of this sort.
I think some might interpret this as willy-waving.
Being a simple person, I like to look at it like this.
Digital signals are decodeable providing noise added does not approach the amplitude of the digital signal such that it is not possible to reliably distinguish between a nought and a one.
The length of the cable will have an affect - as distance increases, the amplitude of the wanted signal decreases and the noise gets proportionally greater, depending on the environment.
Thus, any cable should be low loss and screened.
To answer the OP - unless you are going to send signals to your mate's house down the road, the normally available screened cables will suffice. This should cost no more than 2 quid per metre. It might even get you to your mate's house as well!
|Thread: Weller Soldering Iron tips|
From memory they work on the curie point tocontrol temperature and are therefore magnetic.
Curie point, also called Curie Temperature, temperature at which certain magnetic materials undergo a sharp change in their magnetic properties.
|Thread: Air compressor query|
Gary, yes each output has sliding valves - difficult to see on the pics.
All the fittings are ¼BSP.
Dave's solution is good though, especially if you have hands like bunches of bananas like I do
If you are interested in the silent type and can accommodate 24L instead of 35L, this might be a better bet for around the same price.
Depends what you need it for - as always.
In my opinion there is good back-up and it is ready to go.
I have first hand experience - I have the 50L version which is ideal for me.
|Thread: Battery Packaging Teaser|
Posted by Ady1 on 25/02/2021 07:37:17:I found that when a gadget like a torch or a tv changer failed it was only one cell that was the issue, not 2 or 3 or 4
Good point. We put so-called dud batteries in a box ready for recycling, mainly AAs. Next stage is for me to go through them with an Avo. Around 30% of AAs will usually produce in excess of 2A short circuit current - certainly useable for many applications.
Yes, I have been caught with stickers on batteries. Once bitten and all that!
|Thread: thresher belts|
Posted by old mart on 21/02/2021 15:34:38
I remember my father helping with a threshing machine being used for threshing wheat. The tractor was a Fordson major and the belt was extremely long. The threshing machine was made of wood and angle iron, and was used back in the fifties because it left the long straw for thatching.
Yes, good point about the straw - also useful for potato graves or clamps and better for stock bedding. Combine straw was/is just a mangled mess.
In my area they used the Field Marshall tractor, started with a 12 bore cartridge, which just sounded beautiful. The threshing machines were Foster and had to be levelled using a built-in spirit level. Oh well - back to the prologue.
Edited By Anthony Kendall on 25/02/2021 09:16:35
Posted by JasonB on 19/02/2021 16:50:18
I probably delete two or three threads a week and more posts and and it goes more or less unnoticed ....
Suggest you don't know that - you only think that because nobody complains - probably because, hopefully, they have more important things in their lives..
That said, the forum is free and run by Neil (I think) and the moderators and they can do what they like with it.
Accepted, a forum has to have moderators, reasons should be obvious..
If people do not like anything they can leave (hopefully without making a fuss).
If moderators find the burden too much - don't do it. Don't expect people to be grateful - the world works differently.
I can't see a problem here - I can only see navel-gazing.
|Thread: If it looks like an MCB .....|
Posted by Dave Halford on 07/02/2021 12:06:02
What makes you think RS or Farnell check what they buy, other than whats written on the box or spec sheet?
Because I know they do!
Posted by SillyOldDuffer on 02/02/2021 11:26:55
Of course the chance of getting a punk product is higher if it's bought cheap from an unreliable source, or if you set up a website to expose them and people send in examples! Being sold rubbish has always been a problem and always will be. Caveat Emptor has been good advice for over 2000 years... Dave
A great deal of truth in that.
You are unlikely to buy one of the MCBs in question from RS or Farnell. You will pay more but, at my age, I should realise by now, you get what you pay for (mostly!).
This applies to my thermostat really.
I have a bigger problem with buying software driven stuff - you only find out what it really does, after you get it, and it's no good asking - I think I am just an old git asking awkward questions, talking to a pimply-faced youth with shallow knowledge - but that's another story.
Edited By Anthony Kendall on 07/02/2021 11:12:05
Posted by Steviegtr on 02/02/2021 01:18:50
So i guess from the responses on here the outcome is , do not buy anything electrical from China. This will include VFD drive units & anything that could kill you. Stay safe guys & gals . & remember where the covid came from. Chine wants to rule the world. It ain't gonna happen. Steve.
Not quite Steve, but I am wary of the spec in many cases.
I bought a thermostatically controlled mains switch which was rated at 16amps (3.8kW). The appearance suggests not but...
I ran it with a load of 2kW and the functionality was fine for a while, then the photo says all - not to be left unattended!
I find much of the Chinese stuff works fine unless you start to get over, say, 50% of its rating the switched dc so-called PWM modules are a case in point. Thus, I often only get a bargain if I use Chinese stuff and beef up the output i.e. I could only use the thermostatic switch at 3kw if I use the output to operate a properly rated switch, either solid state or contactor/relay.
|Thread: Air Compressor Warning|
Posted by Sam Longley 1 on 30/01/2021 15:34:14:
.... Of course it is wise to highlight the issue on the forum; but some do get a bit carried away.
Perish the thought!
Now everyone has had a fair crack about reservoirs, is anyone else concerned about the quality of the output fittings on most of the available new compressors?
Having had a pressure switch failure, I removed the whole assembly from the reservoir, breaking a casting in the process. This enabled me to examine it - the body was made of what some call muck metal and it was pretty easy to prize off pipes branching from the main stem, at the joints.
Looking for a replacement, I found the whole assembly, including switch, two gauges, regulator and the tree all ready to screw into the reservoir, all for about 12 quid delivered - they are all over the net!
Having looked at what came off, the switch looks reasonable quality, but the remainder seemed just crap.
All that said, I decided to use a new switch and mount it using decent fittings. Probably, if the switch had not failed, the whole lot might have carried on forever - as long as I had not caught anything on it!