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Member postings for Nick Clarke 3

Here is a list of all the postings Nick Clarke 3 has made in our forums. Click on a thread name to jump to the thread.

Thread: Model boiler safety calculations
18/01/2021 18:50:51

As far as I recall there were a few formulas in later editions of the Model Engineer Plans Handbook 3 but these seem to go for very silly money online.

But I suspect that formulas were less important than ‘rule of thumb’ and experience. Here are some instances from old ME magazines – and through old ‘grandfather’ rights they could possibly still be built today (not that I would!)

‘The boiler (for a 3 ½” loco) was made from 18g copper as I had some in’ (LBSC Canterbury Lamb, describing Grosvenor’s boiler)

‘The stays were made from 1/8” copper unwound from electrical cable I was given’ (LBSC again)

Another author made alterations to a 7 1/4" boiler design in the very next instalment and then published a design with further revised staying in the instalment after that (Martin Evans, Highlander design)

Edited By Nick Clarke 3 on 18/01/2021 18:51:48

Thread: Pansy Cylinder Drain Cocks
18/01/2021 14:45:07

This is the arrangement of the lubricator

lubricator.jpg

As for the drain cocks they would need to be in the end covers, but as far as I can see there was no provision made for them in the original design.

Edited By Nick Clarke 3 on 18/01/2021 14:49:58

Thread: Pressure Gauge feed
18/01/2021 13:26:42
Posted by JasonB on 18/01/2021 13:19:28:

See item 6.6 of the test code, many older designs will need to be altered to allow this, best speak to whoever is going to be testing the boiler.

That section of the test code refers to water gauges, not pressure gauges. AFAIK there is no issue fitting a pressure gauge to a manifold. It is frequently done that way.

Thread: Disposable Gas Bottles
16/01/2021 11:43:46

I have seen them used as vacuum reservoirs for 7 1/4" rolling stock but as an alternative if you ran a saw through the middle, cutting them in two, are they then just scrap steel and no longer pressure vessels or gas bottles?

 

Edited By Nick Clarke 3 on 16/01/2021 11:43:59

Thread: Machining Brass
14/01/2021 17:22:02
Posted by larry phelan 1 on 14/01/2021 16:59:22:

In that case, I must be one of the most experienced metal bashers on the planet !

Started off with a small scrap box, the current one is almost big enough to hold the lathe.

Shh! don't say that - or no matter what lathe it is, someone will post that's where it belongs! devil

Thread: Back issues & Flash plugin
14/01/2021 11:39:50
Posted by Gene Pavlovsky on 14/01/2021 11:09:45:

Every browser has tons of security issues as well, as well as the underlying OS.

Most HTML5 developers I talked to, who had to switch from Flash, agree things mostly worked better and were easier to develop with Flash. Dealing with 3+ different browsers is a huge pain in the ass. I think Flash could have been way better than any current browser stuff, if Adobe would just made it open source and let people advance it.

OS's are developed and security issues are addressed during their service life but they do not have to cope with active content coming from unknown sources making the issues with Flash (and Postscript, JavaScript and even HTML5) more of a problem.

Regarding the open source question, while an enthusiast for it (2 of the four laptops by me now run Linux) the developer's job might possibly be even more difficult if they had to face a multitude of different rendering engine variants, even with access to the source code.

14/01/2021 10:55:27
Posted by Paul Lousick on 13/01/2021 22:19:00:

Adobe has has always suggested to update to their latest version for security reasons. Is there a security risk when viewing Flash files ?

This site lists over a thousand **LINK**

Thread: Cleaning copper rivets.
13/01/2021 20:30:52
Posted by br on 13/01/2021 19:42:18:

Anybody know the EXACT rules on sulphuric acid purchasing?

One google site says illegal tobuy if notc in the trade and you need a licence.

Ebay - oneshot , no problem at all - just bought some a few moments ago as this thread reminded me it was needed.

The link in my post is .gov.uk so is probably as close to definitive as you can easily get - but as fizzy says a lot of people sidestep the law by calling it something else or totally ignore it as I suspect the ebay seller does.

Thread: Interest in pictures of models
13/01/2021 19:33:57
Posted by Oily Rag on 12/01/2021 22:15:20:

My mum stopped me looking at pictures of models when I was 14!

And I suggest putting 'pictures of models' into a search engine on a work computer is fraught with issues as well!

Thread: Cleaning copper rivets.
13/01/2021 19:31:30

Citric acid, vinegar, drain cleaner all legal, but sulphuric acid 15% w/w or stronger (I still can't get used to calling it sulfuric) is deemed to be an explosives precursor and cannot be bought or kept without a Govt. Licence.

**LINK**

Thread: Key Cutting
10/01/2021 22:52:05

Interestingly the concept proposed by the OP was how we used to cut car keys without an original in the 1970's.

Each series,FS, FV, FP etc etc had a set of masters each with a series of notches in set positions down the length of the key all the same depth, but different masters with notches if deeper depths.

The instructions to cut a particular key , say FS 258, were in a folder - cut positions 1, 3, 6 with the No1 master, position 2 with No2 master which was a bit deeper and so on until the key was formed - then repeat fit the other side, different for a 'double safe' key.

Edited By Nick Clarke 3 on 10/01/2021 22:52:40

Thread: The Repair Shop is getting to me...
10/01/2021 16:07:09

And apparently Edd China in Wheeler Dealers felt the show was becoming less technical too

10/01/2021 13:07:43

Here is this TV, the last link with my old Dad - It has a hole in the screen.

Why?

I threw a brick at it while watching the Repair Shop. Can you fix it?

Thread: Angle grinder cut off stand
10/01/2021 13:00:15

Machine Mart used to do a smaller version of the Einheil angle grinder stand for 115mm angle grinders. I bought one and it is useful for the odd job with harder materials , but has now been superceeded by an ALDI bandsaw, at least for mild steel and non-ferrous.

Stands identical to mine are listed on eBay under the Wolfcraft label - a firm with a good reputation.

Thread: Clarke CL250M Metric Screw Cutting Gears
10/01/2021 12:53:06

This table C1 Imperial Thread Cutting (arceurotrade.co.uk) that I found through an Internet search appears to suggest the leadscrew Pitch is 1.5mm

Thread: The Pitch Drop Experiment
09/01/2021 08:55:21

Thanks for your comments Alan, however I don't think they affect the now commonly held view that Glass is not a supercooled liquid.

Taking the first one - I quite agree that glass is amorphous, but that as an amorphous solid the molecules do not flow and rather than having a high viscosity as would be the case above the glass transition temperature, the molecules are joined together but not in a regular pattern.

glass-amorphous-versus-crystalline.jpg

Working at a more practical level - lenses and ancient glass objects would be expected to show some flow and windows would not only be thicker at the bottom but would exhibit flow over frames and the nails holding the panes into the frame, which I have never seen suggested. Hence I am of the belief that the thicker at the bottom concept is due to manufacturing rather than flow. The comment one sometimes sees that glass becomes more solid with age and very old objects are less likely to flow also appears to be at variance with the facts as it is the oldest building glass that is said to exhibit the most flow.

Referring to your second point, that the glass in your lab had to flow to change shape. You have explained how this cannot be the case with wood or steel but both of these materials do change shape and while I agree that it is not due to flow - I cannot agree that glass is a special case and has bent for a unique reason.

Please consider what I have written - I am trying to summarise information garnered over the last 25 years or so since the first arguments against the 'glass is a supercooled liquid' theory were discussed in the scientific press. However it is the accepted theory at present - but the one thing I hope is not to fall out with anyone here, but rather to present accepted and justified (most important that!) scientific thought as appropriate.

Take care,

Nick

Thread: Car Identity
08/01/2021 14:29:44

Headlights steer me towards Lamborghini, but there does not seem to be a match for the rest of the car.

You used to be able to but accessory vents like those in the rear quarter, but I can only remember them in sets of 6 all the same size. You could buy them from accessory shops and even from catalogues like Kays, John Noble etc etc but they usually ended up in the front wings of Consul 375s or early Zodiacs.

Still puzzled because something is soooh! familiar, but I just can't put my finger on it.

Tried to blow up the image to see what the logo on the wheel is but no joy there.

Edited By Nick Clarke 3 on 08/01/2021 14:34:21

Thread: The Pitch Drop Experiment
08/01/2021 09:05:12
Posted by Alan Charleston on 08/01/2021 04:31:39:

Hi,

Glass does indeed flow over time. I used to work in a lab and there was a room set aside for glassblowing. About 20 years before I got there, the staff used to make glass coils for a gas chromatograph from straight lengths of thin wall soda glass tubing (OD about 4mm) which were about 6 feet long. These were stored in a wooden box which was about 5 feet long, so one end was in the box while the other end was supported by the top of the box. After 20 years or so, each of the tubes was permanently curved, with the middle of them being at least 6 inches away from a straight line between the two ends. This was presumably due the plastic deformation (flow) of the glass over that time.

My contention that glass does not flow and that it does not fit the definition of a supercooled liquid is supported by the science (where have I heard that before?) as I understand it so reading your post made me think.

I suspect that the glass was not flowing as if that were the case it would also be thicker at the bottom and develop a 'club foot' so some other mechanism might be at work. I consider this to be confirmed firstly by thinking about wood and similar materials which if stored as you suggest would likely also the have developed a set as you describe with no thought of them flowing.

Certainly bowing of a thin object could be caused by elastic and extraelastic deformation, but this also occurs in solids where the molecules, unlike in a glass, are bound in a lattice and the lattice itself is distorted. For flow to occur the molecules would probably need to move relative to each other.

Thread: MEW 300 IS HERE !
07/01/2021 19:02:20

We had 3 or 4 ratty Triumph Spitfires in the family because everyone, even my 5'2" stepmum found the Midget too small inside.

Father did have a late (black bumper) MGB GT in the early eighties which is the only car with overdrive I have ever driven.

Thread: What Did You Do Today 2021
07/01/2021 18:59:22

Seriously though, before I leave, very nice work!

Nick

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