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Member postings for Nigel Graham 2

Here is a list of all the postings Nigel Graham 2 has made in our forums. Click on a thread name to jump to the thread.

Thread: Not One but Two Odd items!
17/08/2021 17:17:31

I wonder if the gas-burner is for paint-stripping.

Item 2 I'd say a sight-glass as well, though not for a steam-engine's boiler. Catering or brewing equipment perhaps. The two lines may be max/min levels but could also be for metering a small quantity of fluid into some other vessesl.

Item 3, hard to make out and I can't establish the scale, but it looks to me like the generator for a small acetylene lamp, still with the calcium oxide residue in the upper part (the part you are holding). It look similar to the "Premier" carbide cap-lamp once used in non-gaseous mines, and until around the 1970s, by cavers: I still have two or three of these.

If so the calcium carbide was placed in the lower section, and water (the reagent) in the upper half. There would be a small valve in the central tube somewhere to give a slow drip-feed of water, perhaps in the reservoir; and the cork (or felt) plug is a filter to keep carbide debris out of the gas outlet leading to the jet. The action is similar to the Kipps [Gas] Generator used in chemistry laboratories

A photograph of it assembled and standing upright next to a rule or scale-object would help, if you can, please.

Thread: Filling the boiler
16/08/2021 23:03:24

Through the injector?

I'd have thought the overflow valve would prevent that? It opens to outwards flow, not inwards.

Having recently helped repair a boiler with worn out safety-valve threads I'd certainly always use either a dedicated fitting on a pump plumbing, or the blow-down valve. The valve's short outlet pipe is usually sufficient for a push-fitted hose but there is no reason it could not be a screwed fitting to take a pump hose.

I have used this route without a pump, but a large funnel and short plastic tube. It was a bit slow but effective.

There is another problem with using the safety-valve bushes for filling, that if simply via a funnel any water escaping around the spout ends up inside the cladding.

'

That boiler incidentally was given a "new" 2X hydraulic test as it had been modified.

Thread: Problems in bending sheet aluminium to a 90 deg angle
12/08/2021 13:53:22

If that a ngle is hot-rolled it will have a radiused edge, so having reversed it so the upright is at the back, you might find it won't need chamfering.

Thread: What Did You Do Today 2021
05/08/2021 16:46:00

.....For a little injector attention.....

Oh Dear!

Time I went to my workshop....

Thread: EV Charging Hacks
04/08/2021 22:43:41

"...electrification of the battlefield..... also reducing carbon emissions."

Seen it all now.

Death and destruction all around, HE fumes wafting across the land, blazing vehicles and buildings.... but no soot from the tanks. (He said 'carbon', not 'carbon dioxide'.)

Look as if yon Colonel has been practicing how to impress business chaps. Usually, senior officers are exemplars of concise, plain speaking, not "managementese".

++++

One or two on this thread have pointed out that we are engineers and so should appreciate the technical problems and practical solutions, which only scientists and engineers can develop.

I agree entirely but I think it misses the point. The barrier between them and society at large is the policy-makers, of whom most give the impression of not knowing power from energy, or which way to turn a spanner.

Thread: 6" vertical boiler cladding and testing
04/08/2021 22:19:54

Matt -

Have a look at Luker's post on here introducing his Ballaarat construction series.

He includes photos of the preserved original and of his replica, showing that has wooden cladding with just three fairly broad brass retaining bands: one each end, the other in the middle.

04/08/2021 22:14:15

Neat way of doing it, Rod!

I find card cut from cereal packets quite good for templates and test developments, though the box seams can make folding awkward.

04/08/2021 17:02:57

Fine work!

Mahogany has a very attractive dark reddish-brown colour but its main advantage is being strong and close-grained.

I'd think there is any hard and fast rule about spacing the lagging bands, but start with one round the top and the bottom of the wood (the lower being the foundation-ring level unless you intend taking it full-depth for better appearance).

Then I'd have one each at the thrids points but that might be very easy here due to all the fittings, fire-hole etc. I'd be inclined to experiment to see what is most pleasing as well as mechanically sound. You might find a single central band would both look and work well.

The method you describe for joining the ends of the bands is as common and as good as any. A solid but neat block on each end is certainly better than simply folding the strip up, which the screw would try to straighten out so look poor.

Under the wood? You won't have much room but a thin insulating layer will certainly do no harm. The total thickness of blanket and wood is largely dictated by the fittings and their bushes, allowing you to remove a fitting if necessary without having to disturb the woodwork.

It may well be better not to glue the boards together. I'd be tempted to machine a very shallow rebate, fractionally under the band thickness, on each end of each board to engage the rings, to stop the boards moving vertically.

''''

On boiler testing, as this is copper it should be inspected first un-clad, but not need the cladding removing in future. I'm not sure but I don't think setting the safety-valves hydraulically works all that well. I think you'd still need re-adjust them during the steam-test, so they match the red line on the gauge.

Thread: Milling machine identification - "Deutsche Waffen Und Munitionsfabriken"
01/08/2021 19:49:52

I've just examined the Lathes.co Denbigh section again, and its text reveals this:


"Long a common practice in many spheres of industry, Denbigh also made batches of un-branded milling and other machines for distribution by third parties. ... some ... millers differed from the regular Denbigh specification with some obviously ... to a customer's particular requirements."

(ack. Tony Griffiths)

None of his illustrations, apparently all from catalogues, show the left-hand drive, single-slotted table though some captions refer to that under photos of machine with clearly, 3-slot tables (as mine has).

Rainbows' rescuee might have been exported legitimately to Germany, before Hitler came to power or at least before any such exports stopped. Although not giving dates, lathes.co does state the H-series milling-machines were produced from pre-WW2 onwards.

My reasoning:

".... stolen by an englishman circa 1918. "

Too early for Denbigh H-series mills although Denbigh and DWM were both long established by then.

So what does Wikipedia tell us? Firstly that the name-plate was not a Nazi-government armaments organisation but a commercial company heavily involved in supplying the armed services except between 1922 and the later 1930s. It had been founded as a gun-maker, in 1896. ("Waffen" is a military, but not Nazi, word.)

According to that Wikipedia article the German firm was banned from armaments production after WW1 (though still did in small, secretive ways). After a period of take-over and re-naming, it reverted to its original name in 1936, in Third Reich days; though it had become Quandt-owned in 1929.

'

So when that milling-machine Rainbows found was actually made, and where it has been all these years, is still something of a puzzle, not least because Mr. Griffiths tantalisingly does not tell us when the model was first made - except that the first, the very basic little H1, was created in the 1920s. Nor does he say when Denbigh was established. Maybe you have to buy one of his catalogue facsimiles to find out more closely!

Piecing things together, I suggest this example, which looks capable of being restored to fully serviceable condition, could have been a legitimate export to Germany in the late 1920s or early 1930s before the DWM name was revived. The DWM plate could have been added later.

The name-plate is not of a Third Reich organisation as such, leaving two possibilities if the firm at some stage had bought the machine new and not looted it in WW2 from an occupied land.

DWM may have owned and used the milling-machine all along, later possibly helping arm the regime; or had sold it but left their asset-plate on it, during the company's inter-War upheavals including the munitions ban.

'

To summarise, this machine could have been bought innocently by former-DVM in the 1920s or early-30s, between the machine's introduction and Quandt eventually reviving the name.

Since the DWM plate/s (I think there is one on both sides) are where Denbigh embossed its trade-mark, but not name, and given the above Denbigh marketing details, it's tempting to wonder if any name or mark lies below it or them. The plates may have been old ones that had languished in a store for that gap of up to about 14 years.

'

After WW2 what had been DWM became a railway rolling-stock builder under a new name with the same DWM initials. What became eventually left of it, became absorbed into an Austrian firm now making robotics equipment.

'''''

While at it, I went and re-measured the table screw on my Denbigh H4. Yes, it is of 6tpi, not 4mm lead, eventually confirmed after inconclusive attempts with a DTI, by measuring longer distances by pencil-mark and a word-processing rule's twelfths-inch scale. (24 turns of the handle, which has no dial, moves the table 4".)

From above, it's possible this odd pitch was to special order - for the printing industry perhaps?

Thread: Greenly Reverser
01/08/2021 17:25:02

I'd already suggested that, Duncan!

Thread: What Did You Do Today 2021
31/07/2021 22:18:07

Oh, I am sorry to read that. I assume you were in the audience!

It can't be easy matching an orchestra to a huge instrument whose player cannot alter the volume of any but the Swell ranks, and (he explained in interview) cannot see the conductor except by a mirror above the console!

The festival also includes some organ recitals I believe. There is one tomorrow morning.

Thread: EV Charging Hacks
31/07/2021 22:03:26

I'm assuming this is for home chargers, not public ones.

I can't help thinking the most secure option is a wired-in cable and connector only outside, with the charger on a simple time-switch, full-charge sensor and manually re-settable NVR; all electrically shielded and inside the house. The trip is to prevent unauthorised swapping of car or cable; and to protect the equipment from open-circuit faults or indeed theft.

No "computers",. no "smart"-phones, "wi-fiddlesticks", fruit-pies, or anything like that!

It is a battery-charger, albeit a high-voltage, high-current one, for goodness' sake!

Thread: Greenly Reverser
31/07/2021 21:47:37

A suggestion if your enquiry draws a blank.

Essentially, design and make a half-nut held on a die-block working in a slot in the reversing-lever, to accomodate the vertical displacement due to the lever's arc. The nut would be operated from the trigger that would otherwise operate the quadrant catch; the thread itself giving the notches on a "quadrant" of infinite radius. (c.f. the toothed rack)

Provided the engagement is sufficiently positive, you should need only the upper half of the nut, otherwise you are looking at a clasp-nut worked by a cam or double-ended lever, similar to that on a lathe.

The thread would probably have to be of square form to remove any ramp-climbing tendency, and the lever preferably double-sided over the screw to support the die-block from both sides.

Have you tried contacting the RH&DR for information?

'

I believe there was an early 19C standard-gauge design for such a combined control, but which overcame the arc displacement problem by using a barrel-shaped screw. I think it was found too difficult to make economically; but I imagine it would have required either a thread-milling capacity very advanced for its time, or much simpler and much more likely, a centre-lathe fitted with a profile-follower.

I do not know how it handled the question of thread-flanks not radial to the reverser-lever fulcrum / screw-radius centre. A profiled thread perhaps; the half-nut or catch made to swing about its own centre, or the nut "thread" being horizontal pins like a segment of a lantern-gear.

Thread: Death of a scammer
30/07/2021 22:15:48

Have they established how he aquired the money, yet?

Thread: What Did You Do Today 2021
30/07/2021 22:13:58

Another stage in turning the upper part of the venturi for my steam-wagon's chimney, out of cast-iron billet.

... Errr, step back a bit.

I'd set it in the 4-jaw on my Harrison L5 and gently turned a central band to take the fixed steady. Only found I could not move the steady back far enough to engage it as its clamp-plate was jamming on something under the ways.

Step back a bit further.

I'd acquired this much pre-loved lathe complete with a fixed steady for a diffwerent machibne and no clamp-plate. So by dint of some rather awkward setting-up I'd modified it to fit and made a simple clamp out of thick mild-steel flat. So why was it jamming?

Excrescences in the bed casting, so yesterday I filed them down a bit, and put some chamfers on the plate. Then found pushing the steady back enough for the work-piece put the clamp out into the gap. Only, if I put the gap-bl0ock in th eplate would not enter that.

So this afternoon's task was fettling the gap-block and putting bigger chamfers on the clamp. Now it fits!

Right, now I could turn the billet's end diameter and face it! Why do so many model-engineering tasks need so much workshop-engineering?

Finished in time to close up, unearth myself from the oil and graphite, have tea and settle down to...

The First Night Of The Proms!

With a proper audience too, socially-distanced BBC Symphony Orchestra (on an enlarged stage), and in the Royal Albert Hall's 150th year. The presenters told us this season will mark that with a goodly set of programmes for the RAH's magnificent 9999-pipe organ. (You'd think the organ builders, Willis I think, would have managed one extra note somewhere!)

The two main pieces were among my favourites too. Oh I am spoiled. Poulenc's Organ Concerto, and Sibelius' Second Symphony.

.A complete change of tone for tomorrow's Prom, with an evening devoted to the big Broadway musicals.

Thread: Yet another scam
30/07/2021 21:47:52

One persistant gang sends e-posts headed "Costumer Services" [sic] , or (I think from the same scum) headed with a genuine supermarket name such as Morrisons. They seem pretending to be offering some sort of bonus or something.

However the liars leave an obvious clue as well as the preposterous claim - a bizarre sender's address, and the 'View Source' tool it reveals any reply is "bounced" through another strange, temporary address.

Having tagged several of these by name and domain they now fall into the Spam trap, so I can delete them at leisure..

Thread: Milling machine identification - "Deutsche Waffen Und Munitionsfabriken"
30/07/2021 21:27:56

That is a Denbigh H4!

Or a German copy.

Or did Denbigh copy / badge-manufacture some German make?

Look on lathes.co, under Denbigh.

(I have one, presently under restoring).

There are differences though, but it's quite possible your new acquistion was a later, more developed version than shown on Tony Griffiths' archives and my specimen. His archive photos show an open belt-feed for the table-feed cardan-shaft, and on the right-hand side (operator's right).

On mine:-

- The chip-tray is rectangular as yours is. Toney Griffiths' catalogue photos of other, perhaps older, editions show a rounded tray. Also my chip-tray is not on the machine but the integral top of a massive cast-iron stand that when minus the machine looks wierdly like some Victorian patent "thunderbox".

- The table feed is/was as described above, and with the handle on the right. The wormwheel is still on the screw but the rest is missing. It is possible yours was adapted for "left-hand drive" of course.

- The overhead arm is similar but solid not tube, and the reduced section on mine is eccentric to the bar, perhaps to align the drop-bracket.

- The spindle nose is not cross-slotted (for a collet with driving-dogs), but is a plain MT3 taper.

- Mine too has that curious little protruberance with a blind hole, on the front hoop leg, and of no clear purpose as the spindle is lubricated through those two oil-holes. I have not worked out what that is for.

- Mine lacks a depth-stop, but seems never to have had one, rather than lost it. Nor does it have what looks like a cover over the back of the spindle, but that might something to do with the different feed mechanism.

- Different table. Denbigh did use single-slot tables but mine has 2.

- Mine carries 'Denbigh' embossed on the stands' cast-iron door, but not the machine itself. Instead the body has the trade-mark Staffordshire Knot embossed on both sides, in positions corresponding to the German armaments plate on yours. I wonder what that owner's plate might conceal.

A curious feature on my H4 is its 6tpi feed-screw, and this exercise make me wonder I had simply assumed inch-fractions and not measured it very accurately. All I did was wind the handle a few turns and watch a pencil mark against a rule. 1/6" = 4.2333 mm; so close I am tempted to measure it properly.

.....

Some years ago somebody exhibited a beautifully-restored and very much "breathed-on" Denbigh H4, geared drive and all to his own design, at Sandown. Only... It was not 'Denbigh' on the side but some other name, I vaguely recollect 'Patrick' but could be wrong.

There was a lot of badge-building going on - my "IXL" lathe I subsequently donated to Lynton & Barnstaple Railway's workshops (I wonder if they still have what had been an extremely useful lathe to me?) proved from Mr. Griffiths' scriptures to be an Erhlich, made in Germany. IXL was just a machine-tool seller.

Thread: Useful?
29/07/2021 21:20:36

Even if it worked, as Oven Man doubts it would, it looks to me as if made from mild-steel, and would corrode quite rapidly despite what appears to be passivated zinc plating.

Thread: WNS - Prompt service!
25/07/2021 16:28:17

I've just bought a scroll-bender and bar bending-brake (V-tool type) from WNS, of Rochford, Essex.

The company specialises in power-driven sheet-metal, pipe & bar forming machinery, particularly for ducting and similar manufactury, but has a range of smaller, manual machines. Though judging by the operating manuals I think they are actually made... elsewhere.

Prompt delivery following my telephoned order; my only beef being that the packing was inadequate for the larger, heavier scroll--bender with its several separate parts. Fortunately, with help from WNS' sales lady and a photo she kindly e-posted, I established nothing was damaged or missing. A "spare" hole in one component proved simply associated with that component's use on another rmachine.

This iis not my first purchase from WNS. I have a "jenny" I bought a few years ago, and recently used it for rolling a single corrugation (can you have a corrugation on its own?) round the thin steel casing of my steam-wagon's ash-pan, though I've not mastered how to use it for flanging discs and cylinders.

Thread: Excellent quality imperial fasteners
25/07/2021 16:13:14

Thank you Peter.

Good name for a maker of threaded fastenings!

Anyway that's another on my growing index. The address is acmestainless[dot]co[dot]uk.

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