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Member postings for Nigel Bennett

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

Thread: .dwg and .dxf files
12/05/2022 13:07:20

My usual procedure is to send two files - one a pdf of the full drawing and a dxf file of the other with a bare outline of the part, including one dimension to check scale. I also append a note with thickness and material on the dxf. I used to add a clue to the size of the drawing - so the filename is eg. XYZ-123 - A4 - Iss 1. This helped back in the day when we updated the drawing so that we got the revisions done and didn't get sent an obsolete part.

This is how I used to deal with it professionally and it worked well.

Thread: Ball bearing cups for bicycle hubs ?
10/05/2022 12:33:02

Many years ago, I used to buy new Campagnolo cups as spares from an outfit called JD Whisker in London. Gone, now, sadly but depending on what hub it is, you may be able to source some NOS ones.

Getting the old ones out of a hub wasn't easy and for Shimano ones later it was virtually impossible - by design, presumably.

Surface finish and the heat-treatment of it is very important as others have said, so it won't be easy to make them. I did find in impecunious times I could just about turn the cones with a round-nosed carbide tool to remove pitting but it was never the best solution.

Thread: Another CAD challenge
06/05/2022 15:04:32

In SolidWorks, I would simply add a concentric mate of the curved surface on the Part 2 grey tube to the curved surface of part 1. I would then align a plane on both parts to ensure it was vertical and then create a distance mate between a plane on Part 2 and some feature - perhaps the face with a dot on it - to another plane on Part 2.

Thread: Ambiguous words
01/05/2022 20:41:55

There was a chap for whom English was not his first language. He asked for clarification of the phrase, “Mary was great with child.” Explanation followed. A little later he asked, not unreasonably, for the meaning behind the phrase “Mr Smith is great with children.”

25/04/2022 12:08:13

Worsted. As in trimmings. And to be worsted in battle.

Thread: UK DRIVING LICENCE [ 2022 issue ]
14/04/2022 20:36:02

Photo? Good heavens! A photo on a driving licence? What will they think of next? Mine's a piece of paper with green and black printing on it, dating back to 1981... I wonder how many of those are still in use?

Thread: Pipe lagging
05/04/2022 11:59:37

Fewer grammar Nazis.... LOL

Thread: What size are my nipples
03/04/2022 16:16:20

M6 is the same size and pitch as 0BA; just the thread angles are different.

Thread: April questions---for one day only.
01/04/2022 10:39:11

Oh give it a rest... steady on!

Thread: Indicator
24/03/2022 15:25:54

If you want it for setting up work in a 4-jaw, don't get a digital one - buy an analogue one. If you're using it for actual measurement, then a digital one is a good choice.

Thread: setting up new hobby shop
23/03/2022 16:16:39

Well, Jordan, the first thing you need to work out is how big are the bits you want to make? That will determine the size of lathe you need. What kind of bits? Will you need milling facilities as well? That can be obtained by the use of a vertical slide attachment or a rear-mounted milling head. Neither solution is ideal but it can save a lot of space and pennies.

If you're looking at Myfords, they are good machines and tend to hold their prices well - so expect to pay a bit for one in decent nick. There are a lot of clapped-out wrecks available which you should steer clear of unless your interest is in restoring clapped-out old lathes. For which purpose you'll need another lathe...

Myfords have had more written about them and more modifications/attachments/extra bells and whistles made to and for them, so that within their size they can be made to do pretty well anything. Spare parts are available despite them being a fairly old machine.

Boxfords are generally a good buy as they tend to be cheaper and are very capable machines.

If you buy new Chinese equipment you'll have some kind of come-back from the supplier if it's faulty, but they have their limitations and the electrics are often a bit fragile and expensive when you let the magic smoke out of them. Chinese stuff is often very obviously made to a price and so the finish tends to be a bit poor where it doesn't really matter, but generally the important bits like the bed are pretty good and often hardened. Plastic gear wheels can be a bit prone to failure, too.

There are several books available eg Sparey's The Amateur's Lathe which should help.

Thread: Advice on Cluttered Dimensions in Drawings
21/03/2022 08:36:26
Posted by JA on 20/03/2022 20:17:15:

Dimensions SHOULD NOT BE CHAINED, an almost universal fault on model engineering drawings. They should be taken from a single datum.

JA

I disagree; you cannot make a bald statement that you "should not chain dimensions". If you have an important centre-to-centre dimension that must be held to within a tolerance, then using a common datum would double the permissible variation between your important centres.

What is wanted is a copy of the good old BS308, (now sadly obsolete). That tells you all about dimensioning!

20/03/2022 14:49:27

I'd create a cross-section and dimension the diameters on that. If they're external turned dimensions, then a side view would be used to put them on. The 7,00 dim you have would be best in the right view as you have it.

Thread: 3 1/2 gauge A3
08/03/2022 09:17:54

Are there any documents with it such as boiler certificates? Having such provenance will make things a lot easier if you want to run it in public. If you run it in public you will need insurance; the only really practical way of getting that is to be a member of a recognised Model Engineering Society. The advantage of that is that you will also be able to tap into expertise and assistance in getting it running.

However, if you're only going to run it in your back garden by yourself, then it's a bit simpler. For your own peace of mind before lighting the fire in it I would advise you to do a hydraulic test on the boiler. This can be done by means of the tender hand pump, assuming there is one. Do not rely on the pressure gauge on the boiler - how do you know it isn't wrecked because it froze up in storage? You should check it against a gauge of known accuracy before you trust it. Cue membership of an ME Society - they have such things.

The reason we test boilers hydraulically is because if it does go bang, you might get a little wet. If you use air or steam and it goes bang, you may need some wings and a harp.

Having satisfied yourself that the boiler will hold pressure, the simplest way of seeing if it's likely to run is to couple it up to an air compressor and see if the wheels go round. No air compressor? What about a type pump - but you'll need some means of connecting either device to the engine. Cue need for a lathe or membership of an ME Society.

Getting it in steam will require an electric "blower" (i.e. sucker!) which draws the air through the fire until the loco's own steam blower can operate. Start the fire with paraffin-soaked charcoal, adding this until you start to see steam and then switch to coal. Charcoal is good enough to try it out if you don't have any coal, but the loco is designed to burn coal, so you won't realise its full potential on charcoal. ME Societies usually have coal available.

Running it jacked up (stationary) with the wheels lifted off terra firma is OK for a moment or two, but it's far from ideal as the motion is not in its normal position and there may be unexpected bangings and such.

You mention "sourcing parts"; well there you may have a problem, because unless you want something like an injector or a simple boiler fitting, you're likely to be out of luck. Macc Models do a range of fittings, as do Blackgates, Reeves 2000 and others who advertise in the ME press. You certainly won't find a ready-to-fit left hand bogie wheel or a cab footstep in a shop, like you might obtain Hornby spares!

Then where are you going to run it? have you got a track in your garden? Cue membership of an ME Society with one.

So no - Don't don't - if you're serious about running it, go and find a local club, join it and seek advice there.

Thread: Railway station toilet signs
04/03/2022 20:10:49

The sign on our bog door is a small version of a Lynton & Barnstaple locomotive nameplate.

 

LEW .... what else ?

Edited By Nigel Bennett on 04/03/2022 20:11:15

Thread: Machine movers
22/02/2022 19:51:44

+1 for Steve Cox.

Thread: Anybody else remember Chuck the Muddle engineer?
21/02/2022 12:13:21

I too really enjoyed Chuck's antics. Not only humorous, but very well drawn indeed. One that springs to mind was when he had a rear wheel come off his car. He stopped, tied a bit of rope to the axle and threw the loose end over the car roof. He walked round the car, pulled on the rope to level up the car, tied the loose end firmly to the door handle and drove off...

On a similar theme, who else enjoyed Michael Oxley's Christmas articles in ME back in the 1950s? They were very funny indeed and I think he pretty well sewed up all the humour to be written about our hobby. If you have the slightest sense of humour, they're well worth while digging out and reading. Somebody even plagiarised some of his stuff much later, which I thought was a disgrace. Michael Oxley also made a boiler from solid, but his was a pot boiler; on one attempt he bored out the 3" diameter copper bar to 3,001"...

Thread: HOW FAST - ANEMOMETER CALIBRATION ?
19/02/2022 16:59:51

I calibrated mine by holding it out of the car window - making sure Karen drove it in both directions along a quiet road. That way it was she who got done when we got caught doing 130mph...cheeky

Thread: Lubricator
14/02/2022 08:58:36

Arc Euro sell non-return clutches; a type of needle-roller bearing.

Thread: Zyto Lathe
01/02/2022 20:09:55

The thing that nattered me was the lack of calibrated dials on the cross slide and top slide. I had the brilliant idea of making some temporary ones in cardboard. I never actually got round to making more permanent ones before I got rid of the lathe and moved up to an ML7.

I well remember going to see my bank manager and asking to borrow the £45 to buy that Zyto... I learned a lot on that lathe and I hope you will too, Steve!

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