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Member postings for JasonB

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

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Thread: Northumbrian First Project
31/07/2009 19:34:06
Just been checking a few of the proportions on the frame drawing and the 9/16 dim mid way along the top of the frame is the same proporting as the 3/4" spacing of the holes for part 10. and much wider than the 9/16 spacing of teh cylinder holes.
 
So the question is is the drawing not to scale or even proportion or should the 9/16" dimension actually be 3/4 which would seem to put the cyl holes and part 10 holes in line as drawn and as it seems to be in the photos.
 
I can see some scrap metal about
 
Jason
 
Edit position of part 10 holes was covered by david in earlier post

Edited By JasonB on 31/07/2009 19:48:35

31/07/2009 18:55:35
I would agree with your overall and ctrs sizes
 
The problem seems to be that there is no actual front/rear location dimension for the three holes for part 10. Or are we to assume that the central one is directly below where the 3/8 radius meets the top of the frame.
 
Having just tried laying it out I'm inclind to agree that the 6" dim seems wrong as this puts the set of six bolts for the cylinder far closer to the rear, in fact the top rear one is only 1/8" from the edge of teh 5/8 drop in the frame
 
 
Jason

Edited By JasonB on 31/07/2009 19:11:48

Thread: Beginners' projects
28/07/2009 16:57:57
I made my 10V on a Unimat 3. If you are not sure of any setups I'll try to think how I did it.
 
I did think the same when I first saw the articles that it would have been good to see it done on something like a 7x12 imported lathe which is in the sort of price bracket that a lot of beginners will be using.
 
Jason
Thread: Wheel Castings
19/07/2009 17:35:15
If you can't find them of the shelf then these people will do them, see bottom of this page.
 
And this is the site of the swiss company that make them, you can change the language at the top left.
 
Jason
Thread: Machining Castings
18/07/2009 19:34:30
I was speaking to someone today who machines  a lot of Stuart models and he said that all the 10 H & V base plates he has done recently are chilled and he anneals them before doing any work on them as a matter of course.
 
He is just completing the Major beam and said every casting was chilled and he has spent over £200 on tooling thats be blunted on this model alone.
 
So it does not look like you are doing anything wrong James
 
Jason
Thread: BA Threads or Metric Threads?
16/07/2009 20:32:07
The only problems with ME are that they are not available below 1/8" . But the are the usual thread for steam fittings, pipe joints etc.
 
Jason
16/07/2009 19:16:48
Why use metric button heads which are a bit on the flat side and need filling when you can get threaded rivits or unslotted round head screws in BA
 
I think it all comes down to what you are happiest using and whats available locally, for example I have been working on an American design for a V-twin IC engine that uses their small series of threads. So when the drawing called for 8-32 UNC I used an M4 thread on 5/32" rod
 
Jason
16/07/2009 17:09:20
Thanks Norman I knew a 9 came into it somewhere but it was a bit early in the morning.
 
A year or so ago ME covered the origins of BA threads in teh Letters to a Grandson Series in quite easy to folow terms
 
Also further to nicks query about hex sizes, Standard size BA hex is 1.75 times the major diameter.
 
Jason
Thread: Tyre fitting
16/07/2009 17:04:26
Isoflex is the prefered adhesive for solid rubber tyres, you have a primer & separate adhesive.
 
Have a look at Julia Olds site as it gives a good description, you could also ask on Traction Talk forum as Terry from double B supplies a lot of the tyre material and can answer your questions, also a search back through the model forum there will find some posts on the subject.
 
Jason
Thread: BA Threads or Metric Threads?
16/07/2009 07:34:41
Ther are standard size hex for all BA threads but it is possible to by "one size smaller" heads as well eg
 
4BA hex is 0.248" but you could also get them with a 5BA hex which is 0.220"
 
A standard 4BA from any supplier should be the same size.
 
It is also METRIC BASED. 0BA is 6.0mm OD (0.236") and the next size down is something like 90% of that, then 90% of that etc. Not got time to go into it now.
 
Jason
Thread: RLE Engine
13/07/2009 17:39:58
I stand corrected, it was in ME starting No 3909 Vol 167 15th Nov-5th Dec 1991
 
Jason
13/07/2009 07:33:34
I think the build was covered in Engineering in Miniature, this would have had the drawing in it, you may be able to pick up back issues on e-bay or order them from the publishers. I've got the first one somewhere so will dig it out later and give you a date.
 
Jason
Thread: BA Threads or Metric Threads?
12/07/2009 07:33:38
As Said BA is infact Metric based, there are several reasons for using it
 
There is a larger range of sizes available eg the increments are smaller, BA nuts look correct on a period model as the mass produced metric ones are too thin and chamfered both sides.
 
Also BA sizes suit imperial rod, 5BA will thread 1/8" and 7BA will thread 3/32" so if you opt for metric tap & Dies you will then have to alter what material sizes are used and source metric as most of the ME suppliers still stock imperial.
 
The best thing to do is buy what taps and dies you require as & when you need them for the model you are working on rather than buying sets which usually are of inferior quality.
 
Jason
Thread: Machining Castings
12/07/2009 07:25:06
The tops of the bearing brackets are probably the most likely part to get chilled as they are thin they will cool faster than the rest of the casting, though Stuarts Castings are usually good.
 
Another option is to anneal the casting, if you have an open fire or wood burner put the casting in there for a few hours and then leave it to cool in the ashes overnight.
 
A carbide tipped tool in a flycutter may get teh skin off if you can't get through it with a deeper cut using a milling cutter.
 
Jason
Thread: Northumberland locomotive additional dimension
11/07/2009 20:45:20
The projected centre line of the cyl as drawn comes out a littel lower than 3/8. If the line of the front cut out of the frame is carried through (3/8" below top of frame) it does not meet the cyl ctr line where it exits the frame. If anything the cyl ctr line should pass through the top rear corner of the plate as thats where the dotted line is pointed?
 
Also on the subject of dims, can you confirm the position of the rear horn, the 2" dim from the back of the frame that passes through hole No 8 is a little further back than a centre line projected through the horn.
 
And before anyone says I know not to take dims from drawings but would expect a computer generated drawing to put things in the dimentioned positions.
 
Jason

Edited By JasonB on 11/07/2009 20:45:58

Edited By JasonB on 11/07/2009 20:47:55

Thread: Painting Castings
11/07/2009 12:48:54
For flywheels I tend to clean up the casting around the spokes, hub and inside the rim then do all the machining. After this I paint it and finish up by polishing up the rim with emery, this will remove any stray paint. Should come up like this
 
Jason
Thread: RLE Engine
11/07/2009 12:43:50
We discussed it here
 
Jason
Thread: Blued steel plate
11/07/2009 07:38:58
Reeves sell sheared plate for frame sides, mostly sized to suit their loco range.
 
Jason
Thread: hunt for a past model maker
06/07/2009 19:20:21
There are a few indexes of Model engineer mag on the web. A quick google will bring them up. You should be able to find who you are looking for as they give the model subject and author.
 
Could be Edgar T Westbury he has several IC engines designs and a couple of books on boats. Percival Marshall also did a torpedo boat
 
Jason

Edited By JasonB on 06/07/2009 19:27:51

Edited By JasonB on 06/07/2009 19:31:32

Thread: A professional boiler - poor service
06/07/2009 17:54:36
Posted by wahiba on 06/07/2009 14:50:46:

 
 
There is a recession on, so I would think anyone quoting more than a month should be challenged and anyone quoting over two months left to go to the wall. The 4 month quote as the best suggests that maybe there is one boiler maker and a lot of other companies subcontracting to them.

 
 This is not the case, there are a small number of highly regarded boiler makers and due to the demand they can have waiting lists of upto 12months. They may only be one or two man (or woman) operations and do not sub out any work but the wait is worth it. I was lucky in that Helen From Western Steam had a spare boiler for my Traction engine otherwise I would happily have waited the quoted 10months.
 
I know Paul was in a bit of a rush to get a boiler done for the comming season so this may well have been a factor in his choice of maker.
 
Jason
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