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Member postings for Brian Wood

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

Thread: Anecdote - 3
03/02/2013 13:50:23

These stories of visits to mines remind me of a visit I made in the late 1960's to Markham Colliery near Mansfield. It is now closed and vanished below new development near Bolsover Castle alongside the M1

The abiding memory of that visit was of the constant and disconcerting sound of rock fall in the area left behind the coal cutter at the face where the hydraulic pit props, rather like large scissor jacks, were collapsed and moved forward to support the roof in the working area. I was assured all was well, but at about 1/2 mile underground it didn't fill me with confidence.

My late father told a story of the mine visit organised by the Rotarians in Leighton Buzzard, [come in old clothes] were the instructions. The bus was due to depart when the Chairman of the branch arrived late. He boarded the bus wearing buckskin shoes, cream buckskin shoes, a white suit complete with a white open neck shirt and colourful cravat. The whole ensemble was topped off with a light Panama hat!!

That was in the days when Colonel Blimp reigned supreme after the war and Pop, never one to be abashed by these pompous people, when questioned on 'what gongs did you get old man' on being told they needed a translation. 'What's a DDLM? Don't know that one'

He always took great delight in telling them 'Dan Dan the Lavatory Man'

Brian

Thread: Anecdotes 2
03/02/2013 11:45:59

One final story from Rolls Royce comes from the time the Company put out work to sub contract for the external pipework for fuel, oil supply, air bleeds etc. that runs round the shell of aero engines.

The company involved were essentially plumbers and there were persistently unacceptable levels of rejection in the work they supplied. On questioning what was going wrong it became clear they couldn't grasp at all the concept of the precision needed in pipe bending and the complex angulations required.

RR's answer was to hire a bus to collect the entire company, from MD to cleaner, and take them to the build shops in Derby so that they could see where things went and why it was all so important.

After that the rejection rate fell to virtually zero

Brian

03/02/2013 11:10:10

I don't think I'm revealing any secrets here, but modern aero engines are built into a ring shaped support for hanging in the 'pylon' off the wing. The shape of the ring is made such that the thing distotrs to round when loaded. I don't know the values involved, but getting the ovality assembled into the right place would be crucial!! Blade tip clearances in the hot stages inside are measured in thous.

And from the nuclear industry, in pressurised water reactors with steel shells nearing 10 inches in thickness, the control rod tube holes in the head are machined to allow for the head bulging under operating pressure. This is to ensure that they all [ and there are lots of them] finish up truly vertical to be able to drop the rods into the reactor core far below in the event of a 'scram' requiring prompt shut down.

Brian

Thread: Anecdote - 3
03/02/2013 10:36:45

Hello Neil,

Now that's a useful piece of information, my biggest dread on old timber in particlular is running into a nail, it is usually death to hardpoint saws, afterwards they cut only on one side, if at all. I'll try and rescue the next one.

I have always junked them in the past, they are cheap enough. However, having sheared off the induction hardened edge, the rest of the blade makes excellent stock for flat, toughened, high carbon steel, good for thrust bearing washers for example.

Brian

02/02/2013 09:23:41

Stub Mandrel's story of the gold mine visit and the DSG lathe he photographed there led me to take a look at his pictures. You may now know Neil what your mystery tool is and does; if not it is a Sawset, used for setting the teeth on woodsaws alternately along the blade by preset amounts dialed in by the round part of the tool.

They are largely redundant now with the widespread use of hard point saws that have been diamond ground, but any old time joiner would immediately recognise it. Eclipse were noted manufacturers.

 

Brian

Edited By Brian Wood on 02/02/2013 09:26:04

02/02/2013 09:21:27

Stub Mandrel's story of the gold mine visit and the DSG lathe he photographed there led me to take a look at his pictures. You may now know Neil what your mystery tool is and does; if not it is a Sawset, used for setting the teeth on woodsaws alternately along the blade by preset amounts dialed in by the round part of the tool.

They are largely redundant now with the widespread use of hard point saws that have been diamond ground, but any old time joiner would immediately recognise it. Eclipse were noted manufacturers.

 

Brian

Edited By Brian Wood on 02/02/2013 09:22:03

Edited By Brian Wood on 02/02/2013 09:22:56

01/02/2013 14:17:05

At my first boarding school in the late 1940's, the school play each year used a dimmer wired up for the stage lighting.

This comprised of a large glass water tank, two copper sheets held to the sides and a wooden framed 3rd copper sheet that could be lowered or raised in the space between. The dimming was smooth, step free but this apparatus had open terminals and trailing cables and was operated entirely by hand. Even as a callow kid of 10 years old, I appreciated the dangers inherent in this thing. Clearly this isn't on the heroic scale of your other correspondents stories on this thread, but it was nevertheless a school filled with boys having an exploratory nature.

Brian

Thread: 4mm square (mild) steel tubi
28/01/2013 12:35:06

Hello John,

I don't know where you live, but the Art Shop in Darlington has a display rack of just what you're looking for

Brian

Thread: The biggest time-wasters in your workshop?
28/01/2013 12:31:47

Andy,

I've sent you a PM for a solution to your drwabar problem on the DW mill

Brian

Thread: Dividing
26/01/2013 09:25:48

I've made additional plates for my BSO head which give prime numbers up to 69, it does extend the range quite well for simple indexing. The plate size limiit was reached when any larger would mean mounting the head up on spacing blocks to be able to turn the handle without being forced to have it overhanging the bed on the mill. I was lucky too that my tables came with the BS2 factors shown and these of course show the doublets applicable to the BSO head that can be selected from the standard plates.

What of course we are all overlooking is all the other odd numbers up to 198 and the means to achieve them.

I am tempted to suggest to Boldminer that he questions the number of teeth to cut and thinks of other DP gear sizes that he can index for around the periphery. 198 would be a lot of teeth to cut and are they perhaps too fine a pitch for the application?

Brian

25/01/2013 16:06:53

Hello Boldminer,

The ratio N=4/20 appears repeatedly for several divisions but they are differed by the gearing used on the studs to give the indexing required.

In your case, T=197 divisions has the gears as H=20, A=24,B=40, Cand D have no values and E=48

               For T=198 divisions those gears are H=20, A=24, B=40, C=32, D=48, E has no value

Don't forget you are using the compound indexing method to achieve what you want, where movements are both forward and backward as dictated by the gearing to arrive at the result.

My tables for the BSO device go all the way out to T=380.

I hope that helps you

Brian

 

Edited By Brian Wood on 25/01/2013 16:14:25

Thread: Myford ML7 or Super
24/01/2013 12:04:44

Hello Ian,

I would think the full drawing for Myford spindles, and there will be a number of variants, will be protected by copyright vested with Myford.

If however you just want the detail of the nose for the spindles [ML7 all variants] so that you can fit Myford compatible chucks etc to your mill, the 3rd Edition of Tubal Cain's Model Engineer's Handbook shows it on page 3.8 with sizes and limits.

The book is widely available under ISBN 1-85486-134-4. Buy a copy and preserve his copyright as well; it contains a wealth of other useful information gleaned by the author in a lifetime in engineering

Brian

Thread: Myford wiring
23/01/2013 20:31:52

Hello Jeremy,

The usual dodge is to wire the motor through the 3 phase starter by looping the live through two of the ways in the starter so that the contactor sees a balanced current loading in all its ways. Tubal Cain's Handbook shows this diagrammaticaly and there are other publications showing such wiring diagrams.

For it to work satisfactorily of course the load drawn by the motor should match the capacity of the 3 phase contactor, I imagine they won't be far apart in this case.

If though you are the least bit nervous about this get a professional to check and wire it for you.

Brian

Thread: Shaper Slotting & Keyway Fixed Toolholder
23/01/2013 20:12:16

Hello Paul,

I have just seen your post, a neat idea. May I copy it for my Elliot please?

Brian

Thread: Myford S7 old clutch
23/01/2013 20:05:45

Hello again Jamie,

There is the difference in length caused by 4 pulley grooves [and the longer shaft to accomodate it] compared to only 3 grooves on your older S7, as well as the differing woodruff key positions to overcome.

I really think your best information can only come from the new owners of Myford in Halifax, they adverise in this forum at the top right of this page and in the magazines.

I bought [secondhand] an old style clutch like yours thinking it would fit my lathe, how wrong I was. It sits in a drawer glaring at me every time I go there!.

Brian

23/01/2013 10:10:26

Hello Jamie,

I looked into this some years ago.

I'm sorry to say the short answer is there is not a direct replacement by the cone clutch since a longer hollow bored shaft is needed along with the 4 step pulley to suit the later S7 lathes. I bought the complete kit from Myford Nottingham and have been very pleased with it.

Just a small running detail that solved a problem for me when an unpleasant shriek started to occur on engaging the clutch. A drop of oil on the mating surfaces of the cone stopped it immediately and made for a much smoother take up of drive.

The cone surfaces are all metal so there is no friction material to get contaminated.

Brian

Thread: Can anyone identify this?
19/01/2013 16:50:54

Is anything rotary or sprung built into it?The right hand end seems to be offset from the main body from the flat on the side near the shiny machined diameter. It might be an internal gauge for sizing bores within a limited range.

What are they made in, stainless steel looks possible and are the through holes threaded or plain?

Brian

Thread: Do you know a good foundry?
18/01/2013 09:25:42

For those of us further North than the Midlands, google William Lane Middlesbrough, they offer small runs in various metals.

I have not used them, but the website looks very professional and I have heard good reports

Brian

Thread: An announcement from the Editor of Model Engineer.
09/01/2013 19:48:37

May I add my good wishes as well.

Brian

Thread: universal grinder, drill sharpening instructions
09/01/2013 17:00:08

Hello Dave,

I don't know your machine at all, but you might find a handbook for a Jones and Shipman Universal both well written and informative with proper illustrations. It should help you understand your chinaman

See what Tony Griffiths has for handbooks

tony@lathes.co.uk

Regards Brian

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