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Member postings for Andrew Tinsley

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

Thread: Camden Miniature Steam Services
28/09/2020 13:36:59

I received one of their "flyer" emails only the day before yesterday. I once had a very long wait for a couple of books, that although shown in stock, had to be reordered from the USA.

I think you just have to be patient, they have always delivered.

Andrew.

Thread: What sort of light source to use a strobe disc?
24/09/2020 21:46:25

I built a light beam communicator some 55 years ago. The DC of a torch bulb was modulated with an audio signal. I used a microphone and small power amp for this. The torch beam was demodulated by using a cadmium sulphide cell and amplifier. With good torch optics, ranges of several hundred yards were possible and speech was very intelligible. I have no difficulty in believing that light output from a GLS lamp is modulated by mains frequency and that this can be detected, without much difficulty.

Andrew.

Thread: Blowtorch problems
19/09/2020 19:04:22

I think the Rothenburger is what is known as a self blown torch. The jet of gas entrains air through holes lower down the nozzle. I suspect that some or all of the holes are blocked.

Andrew.

Thread: Sievert blowtorch - regulators and hose failure devices
19/09/2020 15:22:41

NDIY, your assumption of the Gay Lussac law is incorrect. This applies only if the cylinder contains just gas. For a liquid and gas scenario then you need to apply the Clausius-Claperyon law. This gives a much higher pressure than the simple Gay Lussac law which is gas phase only.

Checking published data, my remembered figure of 300psi at 100 to 105 degrees Fahrenheit is not far from the correct value.

Andrew.

19/09/2020 10:41:15

The maximum pressure for Sievert torches is between 2 an 4 Bar. I have no idea what or how the hose failure device works. But I would certainly use a regulator. The propane bottle pressure is around 120 pounds per square inch at normal temperature. This rises rapidly with temperature and as far as I remember, it is over 300 pounds per square inch at 100 degrees Fahrenheit.

I would use a regulator for peace of mind, even if Sievert consider the hose failure device is sufficient.

Andrew.

Thread: REMOVING STEEL BOILER TUBES
18/09/2020 20:37:27

Having done the full size version on several locos, I can assure you that the tubes do not "just fall out" after drilling. There is a small matter of scale on the tubes and they can be a swine to get out!

Andrew.

Thread: Diamond wheel dressing - MEW 297
18/09/2020 15:44:21

The chances of finding anyone to supply a one off industrial diamond is pretty well zero. If you did find one, how are you going to bond it to a steel substrate?

Do yourself a favour and just buy one from Clarke, for a tenner, you won't regret it.

Andrew.

Thread: "The Unique"
15/09/2020 22:12:05

A "dollar" was definite 5 bob! Most people of my age used the term, definitely not a local or regional thing. I still use the term for 25p!

Andrew

Thread: Myford super7 motor U/S
09/09/2020 10:35:41

Hello SOD,

Not all single phase motors have start and run windings. A capacitor run motor has two windings which are permanently energised, for example.

The OP's problem is almost certainly a sticky, or more likely dirty contacts on the internal centrifugal switch as detailed by others.

Andrew.

Thread: Soldering aluminium
06/09/2020 17:47:15

Hello Jason,

I have always used technoweld / lumiweld for soldering aluminium. I have just followed up your lead on Cupalloy. They certainly do a flux for aluminium. However the only solder that they sell for aluminium, says that it is only for pure aluminium and aluminium / copper alloys. Is there any solder that works for the type of alloys that we commonly use?

Regards,

Andrew.

Thread: VFD for M300
03/09/2020 17:10:32

Even if the motor is star only connection, you can modify the winding connections to give a Delta set up. There are motors where it isn't possible, but they are very rare. I recently converted a load of motors from star to delta even though the terminal connection block only had the 3 phases, neutral and earth The oldest motor was a dinky little 1/4 horse, BTH motor from the early fifties.

Andrew.

Thread: Electronics for the Cognoscenti
30/08/2020 12:42:59

Thanks for the heads up. The art of electronics has always been my bible.

Andrew.

30/08/2020 12:42:58

Thanks for the heads up. The art of electronics has always been my bible.

Andrew.

Thread: Old Editions of Magazine
30/08/2020 11:28:36

Must be my record, a triple post of the same message!

Sorry,

Andrew.

30/08/2020 11:00:26

Hello Paul,

It would help if you put the rough location of the magazines. If anyone would like them then it would be a "pick up" job, so location is important.

Regards,

Andrew.

30/08/2020 11:00:25

Hello Paul,

It would help if you put the rough location of the magazines. If anyone would like them then it would be a "pick up" job, so location is important.

Regards,

Andrew.

30/08/2020 11:00:24

Hello Paul,

It would help if you put the rough location of the magazines. If anyone would like them then it would be a "pick up" job, so location is important.

Regards,

Andrew.

Thread: decent 4 jaw chuck to fit myford speed 10?
18/08/2020 11:28:03

I have exactly the same PB chuck on my ML10. It is in the same state as yours (which isn't a copy but the real McCoy)

It was knackered when I purchased the lathe, but everything else was fine. I suspect it is far too lightweight for any serious work apart from very small objects.

I took the Bull by the horns and enlarged the slots and loctited in some spacers to bring it back to nominal. The jaws were OK. It isn't perfect but infinitely better than it was.

Andrew.

Thread: Capillary gaps required for silver soldering.
14/08/2020 21:24:13

Hello Ron,

I don't have much problem silver soldering these days, as I have done a good number of boilers. Like most people replying, you state a gap measurement. Most manufacturers supply the gap range for the various grades of silver solder, so that isn't a problem.

The query I have, is how do you set the gap to 0.01mm ? Apart from the centre punch method, there have been no answers, I know the basics of the science behind the soldering. What I don't know is how do you jig the gaps?

Cheers,

Andrew.

14/08/2020 21:24:12

Hello Ron,

I don't have much problem silver soldering these days, as I have done a good number of boilers. Like most people replying, you state a gap measurement. Most manufacturers supply the gap range for the various grades of silver solder, so that isn't a problem.

The query I have, is how do you set the gap to 0.01mm ? Apart from the centre punch method, there have been no answers, I know the basics of the science behind the soldering. What I don't know is how do you jig the gaps?

Cheers,

Andrew.

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