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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: WHAT IS IT ?
27/06/2021 21:48:40

A possibility. There were still some odd threads around in the early-1900s, perhaps more in horology than other branches of engineering.

Another suggestion I have... clutching at straws, or dropped stitches. Something textile?. Setting pattern- (e.g. lace-) weaving looms or special knitting-machines, maybe?

No good. Short of someone coming on here and saying, "Oh, my Grandad used one of them every day for [ ... ] " , we may have to start asking specialist trades or museums selected by intelligent guess, if they recognise it.

You never know, there may even be modern electronic ISO-Metric equivalents in use as we type!

Thread: electronic cylinder indication
27/06/2021 21:38:10

A very interesting project.

The one point I might suggest with respect if you've not done this, it to place a water-block between the sensor and the cylinder, as on the boiler pressure-gauge, to protect the transducer from hot steam.

Thread: Bureaucracy with a tinge of Madness
27/06/2021 10:55:40

Frances -

I am afraid you are missing the point. You seem to mean that if you want to use a computer or indeed 'phone on-line, you need a deep knowledge of programming, well beyond the basics of simply using the thing.

The technical parts of your posts are way above my knowledge. I would not know what Javascript even looks like, but why should I need know such details? I can drive my car and look after it reasonably well, and even have a lay knowledge of how it works; but I don't know how it is designed.

The problem is not that many of us barely know a cookie from a biscuit or Javascript from an Asian island; but that of the risk of being tripped up by ever more skilled criminals who do know and understand computer systems and languages to degree level and beyond. (North Korea even trains hackers formally, such as those who nearly succeeded in deliberately bankrupting Bangladesh.)

The only defence we have against such attackers is careful use and installing reputable anti-virus software; not trying to learn computer langauges we may have no opportunity to be taught, or would find too difficult. Some, including me, would be faced by both obstacles.

Thread: dirty clutch trick
25/06/2021 14:16:22

Well, something like this is used on horticultural machines more powerful than an ML7 motor, and provided it does not unduly wear the pulleys, as you say a belt is a lot cheaper than a motor.

Thread: Lapping a cylinder with dowel + paste
25/06/2021 14:12:57

I'd split it with a fine-bladed saw, and use the same tool to cut the wedge. That part of the operation does not need great accuracy.

More to the point ensure you keep the lap moving, and as axially as you can.

Recently I carried out the opposite, externally lapping the end diameters of a shaft, with an aluminium lap turned to a close sliding fit on the shaft and in a die-holder. I cut the split in the lap with just a hacksaw, with a touch of a file along the cut edges to remove the burrs..

Thread: Bureaucracy with a tinge of Madness
25/06/2021 14:06:55

Frances -

I for one find that rather offensive.

Falling for a scam out of naivety, or momentary lapse of concentration, is one thing; but not all of us deeply understand computer languages and operating-systems, nor should we need to.

HTMLl? Javascript? Allowing their interpretation? How many people who spend their evenings watching their television, know how a TV works?

Thread: How long does it take to make things?
25/06/2021 12:16:26

I tend not to try to work to the clock but by stage, and in the evening especially by feeling I have done enough for the night. Even then I often seem to wind down gradually; finishing the task but pottering around a bit, putting a few things away or thinking about some other aspect of the project.

By stage I mean completing a particular operation even if not the entire part; or setting up a machine to be ready for the next operation.

Thread: Bureaucracy with a tinge of Madness
25/06/2021 12:12:47

There is a variant (yes, like a pathogen) on the pretent-HMRC trick. This happened to me recently when the message did not try to clain to be from the department, but from an agent.

It promised me about £1100 in underpaid Marriage Allowance (I have never been married and girl-friends don't count) in return for my wife's and my NI numbers and level of earnings.

The site looked impressive: two big blue link buttons, and a photo of a couple at the altar... dead give-aways apart from being so unlikely and not pretending to be HMRC, were the sender's peculiar open and "bounce" addresses.

Block sender, block domain, delete....

Only that will not stop them because the criminals have adopted an anti-blocking, anti-tracing technique using multiple but temporary, random name.domain paths for each message, and I have received several in the last few days.

Yesterday they sent three copies of the same message headed "Costumer [sic] Notice" or similar by this method, with individual open and "bounce" addresses, within minutes of each other; and this morning I received another, pretending to be an very unlikely voucher offer from the Morrisons supermarket.

The only defence would seem to be to make all e-mails text and photos only by default, blocking all links and operating-files unless by specific permission. A web-site could be cited, but its name would be inactive, but its user would need only type the name in the search tool as usual.

Thread: Dial Gauge
23/06/2021 16:22:25

I would trust a Starrett quarter-inch to be a true quarter-inch, unlike some of the what-the-'eck diameters on some of my bought stand clamps and bars.

Nevertheless there seems a Law - it must have someone's name on it - that when you need assemble a set of commercially-made fittings that are nominally compatible... they aren't.

I became so fed up one afternoon trying to mount a DTI and stand on my large lathe I spent the rest of the time making assorted rods to fit my Imperially-dimensioned instruments to the somewhere-handy, bought parts made to Elbonian Standard rather than French Revolutionary, mm.

Thread: Thinking about where I need to improve - measurements
23/06/2021 16:08:39

That's why I use a proxy face, Howard, if I can't pick up the work-piece's own edge:

Apart from 2 or 3 iterations to verify the reading, it means moving the table in the same direction to the "wiggle point " then to the wiggler centre, then to the first machining point..

No reversals and trying to determine the rather wooly end of the backlash.

I do that whether using the dials or DRO.

Thread: Metric Imperial holograph rule
23/06/2021 16:01:31

The name is " significant " as almost certainly the manufacturer, but whether the firm still exists is another matter.

Thread: Radius curves from drawings (example R66)
23/06/2021 15:58:41

If you mean from a centre off the work or its stock material, one way is to clamp the work to a marked-out surface with the centre on that. If the workpiece is thick you would need mark the centre on a block or something to reduce the triangulation error introduced by the height difference.

It may help obtain a better answer if you can supply a photo of what you're trying to achieve.

Thread: Metric Imperial holograph rule
23/06/2021 09:17:53

I must admit that is the first time I have heard of these, but unless it was heavily patented, one possible maker is Blundell--Harling, of Weymouth.

This is an independent firm that used to make slide-rules but with the loss of that market, it turned successfully to what it does now, manufacturing drawing-boards and many types of measuring-rules and scales.

Thread: 2D and 3D Cad Software Recommendations
22/06/2021 23:36:11

I use TurboCAD, the Deluxe 19 edition, which offers a direct orthogonal or 3D choice instead of the 3D-first other makes (including Alibre and Fusion) seem to dictate.

Its makers, IMSI, have released a new edition; I forget its name, but it seems a reasonable price and is a one-off payment rather than subscription. It also saves your work where you decide, unlike Fusion's default on-line saving. To be fair I think Fusion 360 does, or did when I tried it, allow local saving but would rather not. (I can't imagine many professional users would want their design files on the so-called "cloud" , for simple security reasons.)

The agent in the UK still seems to be Paul ('The CAD' ) Tracy, who used to advertise in ME and still has a stand at the main exhibitions...plagues permitting. Try his web-site.

I don't know the differences IMSI have made but my edition still does everything I need and it is capable of far more than I use (or can use, but that's me not it!), such as very advanced 3D modelling. I don't know if it will create CAD/CAM files, and that's not something I need so I've not investigated, but it's worth a look anyway. I would be surprised if the new edition does not.

' ' ;

[Edited to remove one of those blasted grinning-tangerine symbols... Can't the site's administrators switch the damn' things off?]

Edited By Nigel Graham 2 on 22/06/2021 23:38:02

Thread: Appropriate grease for milling Spindle
21/06/2021 14:10:03

The question of lubicating milling-machine bearing is particulalry slaien tpo me because my Myford  VMC mill spindle and quill need attention but there is no obvious way at all, even with the diagram available, to dismantle and service it safely.

However, something of a digression credited to Gerry...

An " anderon " ?

I appreciate that's what your company presumably used internally at least, but is it a recognised unit or a local-convenience one, like calling a potential-difference so-many AVOs?

Puzzled, I looked it up!

It seems to me either coined by the inventor of the particular test or the manufacturer of the test-instrument, of the name Anderon; or become a local-name given by its users, rather as we might loosely refer to "Stillsons" rather than "pipe-grips" : the maker's rather than generic name.

'

The recognised unit of sound pressure level in air, is the dB, the decibel, not on its own because that would be meaningless but " re[ferred to] 20µPa " .

So 0dB re 20µPa is equivalent to 20µPa. (from log to base-10 [20/20] = 0).

It was chosen because it is the incredibly tiny minimum pressure detectable by a fully healthy human ear, and =

5 X 10^(- 9) Bar,

if my arithmetic is correct. Puts the Bar*litre in its place and says something for the whispered sweet nothings!

The scale is fully logarithmic but the results for environmental health and medical purposes are sometimes weighted, indicated by the letter A, to compensate for Nature not giving our ears fully-linear frequency responses over their mean 20hz - 20kHz bandwidth.

In water, for marine sonar and biology, the reference 0dB level is a mere 1µPa; 1 X 10^(-11) Bar

.

The Anderon meter measures vibrations in bearings, vibrations in steel that become vibrations called sound in air, and if I recall properly though it wasn't my field, vibrations in solids are measured in dB re a fraction of g (gravity, as the sensor is an accelerometer).

So whilst the machine no doubt give you a very accurate diagnosis of the bearing's condition  and presumably, directly or indirectly, the sound pressure level at the conventional 1 metre from it, I would be very surprised if the name is no more a standard unit than AVO for volts. If the results are given to customers, nowadays at least they would expect standard units.

My work used sound and vibration instruments, mainly but not only from one of their leading manufacturers, Bruel & Kjaer (Danish but now foreign-owned). They only ever used SI units, not things called "BK", in their advertising and instruction manuals!

 

Edited By Nigel Graham 2 on 21/06/2021 14:16:31

Thread: Thinking about where I need to improve - measurements
21/06/2021 00:01:27

When using a wiggler to set a datum face such as an angle-plate for a much lower work-piece, often I clamp a small plate or parallel to the face - just use a little G-clamp - and "wiggle" to the projecting mating face of that, as a proxy for the work-piece face.

This takes only a few seconds extra, but puts the table movement to the machined features, in the same direction as that needed to find the edge. (I do back off and approach again to verify the edge.)

Thread: Appropriate grease for milling Spindle
20/06/2021 23:50:16

Kiwi Bloke -

I suppose the clue is in that "widely accepted"...

Anyway you set me off on a little simple research.

I have a nearly-empty tube of Dow-Corning 'Molykote 44' - a silicone grease with Molybdenum-diSulphide (MDS) additive. The nearly-worn away printing seems to mention light-duty bearings.

My new tin of Molyslip 'MLG EP' (extreme pressure) grease, carrries small print revealing it contains MDS and Lithium, and is suitable for ball and roller bearings.

I had bought some lubricants from a military-surplus stockist, including 'Grease XG 274'. My admittedly out of date copy of the "Blue Book" - an MoD directory of NATO-stock fuels and lubricants - showed it is a general-purpose compound suitable for race-type bearings. That contains no MDS but careful browsing of the book showed a few other oils and greases that do, and used for bearings. Indeed, it includes Molykote 44, for radar bearings, it says, [and steam-oil for saturated-steam, was used for oiling torpedo-tube mechanisms!] T'net shows this MDS-holding grease is sold for bearings.

'

So where does the "widely accepted" wisdom come from? As the 'Blue Book' shows, and as we ought expect, no lubricant is right for all applications and conditions. Some oils and greases are universal enough for our relatively modest uses; others are designed for very particular purposes. Some will mix with others, some will not; and so on.

I reckon someone somewhere misinterpreted a specific ban on MSD-greases (or a particular type) for lubricating ball and roller bearings in some specific situation, as general for the compound; and went and spread the incorrect message far and wide.

Thread: Motor drive - belt, gear or direct?
20/06/2021 23:11:22

I can see your point but unless you use a variable-speed motor, you will have a machine that will run much too fast for a lot of work, and a bit slowly for some other tasks. Can you design and fit a gear-box between motor and spindle?

Thread: Appropriate grease for milling Spindle
20/06/2021 00:20:53

A valuable discussion.

Kiwi Bloke -

I accept your advice that it is widely accepted that Molybdenum Disulphide greases are unsuitable for ball and roller bearings, but that information is new to me! Could you explain why they are, though, please?

Thread: How long does it take to make things?
20/06/2021 00:06:49

Adding to Mick B1's assessment, another time-saver on long and complicated, or parallel, projects, is to divide the work by character, material and method into first and second (third....) operations.

For example, assuming you don't have a milling-spindle on your lathe so you need transfer these parts to a milling-machine for the second-operations: -

- don't make 4 cylinder covers complete, 8 pipe flanges complete, 6 square-ended spindles complete. Instead finish the turning only on all 18 parts; then set up for all their pitch-circle and squares work.

This considerably reduces the miiling-machine setting and clearing-down to just one of each, because the second-operations are geometrically and mechanically similar enough to reduce the interim settings to tool-changing and distance-moving - but does of course need considerable attention to initial setting-up accuracy.

Where very close concentricity dictates transferring the componet still in the lathe chuck or collet, I would try to make that to be before or after the others; but still include it in the overall second-operation theme.

Similarly with studs, which abound on many machines such as locomotives... Why not make most or all of them in one go (even if split over two or three sessions)?

' '

This approach does not accelerate the machining time. Instead it reduces the total time by minimising repeated setting-up and breaking-down, which are stages often longer than the machining itself.

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