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Member postings for AJW

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

Thread: Painting 5" gauge wheels.
16/04/2019 12:07:39

Not a loco wheel but a flywheel, although similar!

Painted my Centaur flywheel (about 7 in dia) with a spray can of satin black, I think it looks great. Casting surface prepared by filing and Emery cloth with any imperfections filled with JB Weld all sanded back then 2 or 3 coats (by brush) of Bonda Primer which has good solids content.

Rubbed down carefully with 400 wet & dry (wet) masked up the 3 coats spray black.


Thread: Notre Dame
15/04/2019 23:12:52

We were there only a couple of years ago, wonderful building, such a shame.


Thread: Using a propane cylinder for partable compressed air.
04/04/2019 21:41:32

My first compressor was home made using an ex gas cylinder.

Cut a 4 inch hole in the end and welded on a heavy ring to take a bolted on flange for all the fittings.

Welded a frame on top to take large motor and pump and a frame underneath for wheels.

Hydraulic tested it to 300psi and used it for years - did me proud!


Thread: Have your fathers habits rubbed off on you. Just for fun
29/03/2019 17:16:11

Reminded me of my Dad over riding the strimmer safety switch (didn't work) replacing it with a round, brown domestic light switch!

Favourite saying when tidying something up was 'take the dairy off it' , use it myself and people wonder what I'm talking about!

(Not sure where it came from)


Thread: Home made disc sander
28/03/2019 19:07:36

It's got that headstock look about it, wood turning origin?

Looks useful!


Thread: Any Recent Progress in Induction Heating ?
27/03/2019 10:17:01

I recently saw on the tube induction heating of tyres for locomotive wheels where a loose coil was wrapped round the tyre which was fed with hundreds of amps, the tyre went blue and fitted nicely!


Thread: Temperature probe
25/03/2019 08:34:23

Used a type k thermocouple connected to suitable multimeter on my Vauxhall.

Held the sensor in position required with tyewrap and run wire into car via door aperture to meter.

Not high tech but worked fine!


Thread: Resilient motor mountings/bearings
19/03/2019 18:40:55

John, to be quite honest it's been knocking about the workshop for a long time now and I can remember spinning it to get it going (only one direction though, never tried it the other way) and the drill was used like that for a while.

Your right it could be an open circuit winding although I always assumed, rightly or wrongly, that the centrifugal switch wasn't closing properly at rest.

It is only being offered as spares/repair on the off chance it might be useful to someone, I now have no use for it.


Thread: Running problems!
19/03/2019 18:32:42

Armed with a selection of potential springs the second one I tried seemed quite promising.

Continuing to work through my spring selection I came to the opinion that my second choice was worthy of retrying but this time it didn't seem to run anywhere near as good as the first time?

The only thing that changed during these trials was engine temperature, in particular the carburettor which by now was untouchable.

On this particular design the exhaust gases are ported through the carburettor body I presume to prevent icing, as a result I am thinking that the vapour mix is being affected, unfortunately I didn't measure the temperature it had reached but will try again when cold - this time armed with a thermometer!


Thread: Resilient motor mountings/bearings
19/03/2019 13:40:34

Thanks for the suggestions/offers guys.

I did arrange a time delay relay on my compressor so it could run up to speed while it exhausted to atmosphere, then came under load, worked well and I realise that similar could be applied to this motor but this motor really is ''surplus' to requirements and I just thought I would offer it hear as I had read some post regarding bearings and resilient mountings.


19/03/2019 10:40:24

I seem to remember some folk have had problems with resilient motor mountings and/or the plain bearings.

I have an old Delco motor (1/6hp) which has been deemed faulty as it won't start - centrifugal switch as fine once spun up.

It has the rubber resilient mountings and bearings are in excellent condition seems a shame to scrap but that's where it's going if no one wants it. As in classifieds.


Thread: Running problems!
18/03/2019 12:29:05

Thanks for all sugessugges, plug re gapped, hopefully have some play time later!

Michael, I believe the spring strength is quite critical, I have quite a selection of springs as I save them from everything and anything going but wish I had more light varieties!

Jason, that's one chunky flywheel! I can definitely hear the valve lifting and think mine is sort of sounding similar? which makes me think my spring tension can't be a million miles out?

In this link of engine running quite erratically the valve can be heard.



Edited By JasonB on 18/03/2019 13:11:37

Thread: Steel identification
18/03/2019 12:14:50

Thanks for all your generous offers and suggestions, I have updated my profile as well.

I found an outlet locally that specialises in offcuts of all sorts who have come up trumps, EJ Alloys, located in Westcliff and very helpful.


17/03/2019 23:23:34

Amazing, how on earth would that work!

Research required.




Just had a quick look, very interesting.

  • X-ray Fluorescence (XRF) analyser: This is the most common method and the portability of the hand-held equipment allows Intertek to perform PMI on-site at our customers’ premises. The device scans the metal material and identifies its key elements. However, it cannot detect carbon and some lighter elements and is not suitable for identification of pure carbon steel materials.
  • Optical Emission Spectroscopy (OES): This method can detect almost all types of elements including carbon and lighter elements and carbon steel. Although not as portable as XRF analysers, the equipment can be transported to sites and used at high elevations with proper lifting arrangements.


Edited By AJW on 17/03/2019 23:28:37

Thread: Its nearly there !
17/03/2019 21:34:46

That looks great, super job - don't get it all messed up though!


Thread: Running problems!
17/03/2019 21:30:30

Having stripped and painted my newly made Centaur it has been assembled paying careful attention to valve timing.

Original spark plug gap was 0.012 which I have increased to 0.025 to give a meatier spark.

Running doesn't seem to be very good? Not smooth or that regular.

I think my main problems are the spring on the disc valve in the carburettor. Westbury suggests a 'light spring' but in fitting the lightest spring I could find results were very poor, and no firing at all with no spring.

This has led me to find a stronger spring which is giving the results as in the YouTube link. However although it runs as can be seen there is little in the way of speed variation with throttle/ignition adjustment.

Not sure if it can be heard on the link but the disc valve can be heard being lifted from its seat not as a click but as a low frequency sort of buzz upon each induction stroke. Should I try and find a stronger spring?

Mixture screw is actually unscrewed out past its thread! but exhaust doesn't appear smokey as in over rich.

Any guidance on improving the running would be most welcome!


Thread: Steel identification
17/03/2019 13:35:23

Thanks for the ideas, I have found a source of the correct spec.



Edited By AJW on 17/03/2019 13:36:24

Thread: Laptop batteries
16/03/2019 23:18:37

Well done!

I think you have to be so careful of replacement batteries, I bought a 'genuine' Canon battery for my DSLR worked ok for a while then wrecked my £60 Canon charger!

Not the bargain I thought it was.


Thread: Steel identification
16/03/2019 21:20:57

I have makes bits that have bought and I know what they are trouble is I have 'aquired' my stock (as in bits) over the years and most of is classified as 'steel'!


Thread: Slow running Whippet
16/03/2019 21:17:06

Thanks for the video.

That's some slow running! Huge variation in timing although I didn't sense any pre ignition and knocking.

I found with my Centaur a wide variation in revs could be achieved by timing variation although I also noted that it wasn't as happy with a large advance.

I would definitely make the ignition adjustable while running.


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