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Member postings for John Baguley

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

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Thread: Lathe Identification
17/08/2010 19:54:27
Hi Bernard,
 
It looks very much like a Flexispeed Meteor 2 or perhaps an earlier or later version. I bought one as a kit back in 1970 (I think) and still have it, although I don't use it any more. The countershaft on mine uses another headstock casting. I've still got the instruction booklet and drawings for it somewhere.
 
John
 
Just found the advert for it in ME. They were made by Sartglen Engineering of London and the kit was £24.9.6 plus 15/- post and packing !

Edited By John Baguley on 17/08/2010 19:57:19

Edited By John Baguley on 17/08/2010 20:16:13

Thread: Website Articles - Simplex
17/08/2010 01:25:30
Think they've disappeared into a Black Hole!  Or perhaps we've run out of webspace
 
John
Thread: Goodwin Castings
07/08/2010 09:14:18
Dave Goodwin retired some years ago now and stopped producing castings. The National 2½" Gauge Association acquired his patterns and residual castings for the 2½" gauge stuff and I think Blackgates took over some of his other gauge drawings and castings. His castings were very good unlike some of the rubbish supplied nowadays.
 
John
Thread: Cylinder Erection
28/07/2010 02:21:33
Hi Dave,
 
The 'jolt' at front dead centre could be the piston hitting the front cover. Have you tried it with the front cover off? If the piston is hitting the cover and you are happy that the cylinder is in the correct position, you may need to shorten the piston rod slightly to equalise the clearance at each end of the cylinder.
 
Is the piston free to move in the cylinder and slidebar assembly before you fit it to the frames ?
 
I don't use the graphite packing (use PTFE rings instead) but it is possible you've made it a bit tight which could be part of the problem. I think you're supposed to pack the groove and then roll the piston on a flat surface to squeeze the packing down until it is more or less level with the surface of the piston.
 

 John

Thread: Stephenson Valve Gear
22/07/2010 09:40:07
Valve setting was in Volume 96 Issue 2390.
 
John
Thread: Rugby Model Engineering Society
01/05/2010 12:03:38
It was back on line this morning when I looked.
 
John
Thread: Website Articles - Simplex
16/04/2010 12:15:04
Aye up Ian!
 
Bob - if you are a subscriber then you should be able to download the Simplex articles FOC. By the way, it was Keith (Richmond) who scanned the articles, not me
 
John
16/04/2010 09:33:05
The Simplex articles are available for download (subscribers only) on page 5 of the 'Latest Articles' Click on the link at the bottom of the home page.
 
John
Thread: Docstrader valvegear simulation
07/03/2010 20:35:05
Hi Granville,
 
can't give you a definitive answer but I had this myself some time ago. I can't remember if it was with the Dockstader software or one of Bill Hall's versions. It's actually a windows error message, not the valve gear software. I did a search on the net for 'Invalid floating point operation' which came up with loads of results and suggested cures.  I eventually found something that did cure the problem but I can't remember what it was
Hopefully someone with a bit more computer knowledge might be able to point you in the right direction.
 
John
Thread: Live Steam Royal Scot in 'O' Gauge
03/03/2010 13:36:58
I was going to build a RC version of one of these a few years back but then moved up to bigger gauges so it didn't get started.
 
I got the full size drawings from GLR but IIRC at the time they could not supply any of the castings. I finished up buying the wheel castings from Alan Harris. Superb quality but not cheap (about £150 for the complete set).
 
It shouldn't be too much of a problem to fabricate cylinders etc or machine them from the solid. There is very little on any loco that you really need castings for.
 
The original loco was built by Severn Lamb for a French client but it was designed by Martin Evans.
 
John
Thread: Adverts over the top of postings
26/02/2010 00:34:07
Just noticed this but only on the 'Elbow Engine' posting. This time it's the adverts on the right hand side that overlap the text. The other posts seem ok. The first post on the elbow engine does contain a link to Youtube which may be the offending item?
 
John
Thread: Fluorosint , mica filled ptfe
22/02/2010 16:15:05
I initially got the Peek bearing grade from RS but later got some from Davis Industrial Plastics which worked out a bit cheaper. If you go on the RS website and search for PEEK, it will come up with all the various grades available along with the data sheets. It's not cheap but not in the Fluorosint league fortunately!
 
I did look at the glass filled PEEK but I got the impression it's not suitable for bearing surfaces as the glass makes it quite abrasive (could be wrong though).
 
I presume you've got the plain stuff without additives?
 
John
22/02/2010 12:15:53
Hi Mike,
 
no, I didn't try the PEEK just for the heads. I was making the complete valve from it. I eventually abandoned it when the loco seized solid storming up the steep gradient at Chesterfield's track! Part of the problem though is the steam temperature as the loco has a very high degree of superheat and I think the cylinders run at something like 200°C when working hard.
 
I used ordinary plain PTFE for the new heads I made which seems ok. Like you, I found the price of Fluorosint slightly offputting! The beauty of Fluorosint though is that apparently it has a similar rate of expansion to bronze.
 
The PEEK may actually work for separate heads as the expansion does not seem to be so much of a problem so long as a bit of clearance is left between the bore of the head and the bobbin to allow it to 'squeeze' inwards when it expands. The PEEK does have a lower rate of expansion than plain PTFE, but still high compared to bronze etc. Incidently, the PEEK I used was PEEK bearing grade loaded with PTFE, graphite, and carbon fibre.
 
One good point that came out of the experiment is that I found the PEEK to be excellent for coupling rod bushes etc.!
 
John

Edited By John Baguley on 22/02/2010 12:22:10

22/02/2010 00:57:29
Mike, if you are thinking of making the complete bobbin from PEEK, I would not advise it. The expansion is too much. For a running fit at operating temperatures the valve will have to be a very sloppy fit when cold. I experimented with the material for my Helen Long cylinders and eventually abandoned it. I now run bronze bobbins with PTFE heads. Works a treat.
 
John
Thread: Blown X1 Mill speed control
08/02/2010 01:13:57
Hi Oliver,
 
last year I repaired a couple of driver boards for the Machine Mart mini lathe (C3 etc) for a friend at the club. He was on his third board and getting fed up with the cost of the replacement from MM. I replaced the output mosfets on both with a higher spec version from RS and so far so good. The originals were the standard IRFP460 but I replaced them with IRFP22N50A which have a higher rating. The probem with the original IRFP460 is that they can't stand the current drawn if the motor stalls under load. By the time the fuse blows, it's too late!
 
John
Thread: Brass nuts on boiler stays?
05/02/2010 17:24:32
Hi Tony,
 
At least the threaded stays won't fall out or move at the worst possible time

Brass will be fine for the nuts. It's been used since LBSC days for stay nuts. I still use them for the boilers I build with caulked stays (shock, horror )

John
05/02/2010 14:35:00
Hi Tony,
 
You don't really need the nuts at all if both ends of the stays are going to be silver soldered. You only need them if they are to be caulked with soft solder (Comsol etc.). Nowadays, most people just use plain copper rivets for stays with the heads inside the firebox if they are all silver soldered.
 
John

Edited By John Baguley on 05/02/2010 15:01:05

Thread: Martin Evans Columbia Castings
26/01/2010 20:49:00
Hi Jim,
 
Blackgates Engineering list them in their catalogue.
 
John
Thread: Matin Evans, Holmside
20/01/2010 11:21:44
It was serialised in 14 parts starting with Volume 143 issue 3558 and finishing in Volume 144 Issue 3590. Relevant issues are 3558, 3561, 3563, 3565, 3567, 3569, 3571, 3573, 3575, 3578, 3581, 3584, 3587, 3590.
 
John

Edited By John Baguley on 20/01/2010 11:27:28

Thread: Captive steam fittings (on loco's))
16/01/2010 01:10:26
Hi Nigel,
 
the easiest way to adapt the original fittings is firstly to make a new valve stem with the outer part that the handle fits to a smaller diameter than the threaded part. Then make a new gland nut with the hole to fit the reduced stem of the valve. The gland nut then stops the stem from being unscrewed completely.
 

Are you wanting to do this to comply with the latest boiler regs as in the blue book? As far as I am aware, the regs are not retrospective and do not apply to older boilers, only new ones. However, it is a good idea to alter the valves, if only for safety's sake.
 
John
<< First < Prev 20 21 22 23 24 25 26 Next > Last >>
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