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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: how do you scale up drawings
01/08/2010 12:47:28
Multiply the 3 1/2" sizes by 2.0714285 and then adjust to suit standard metal and thread sizes.  You may also have to adjust the boiler dia to suit available tube size.
 
Also watch out for things that will be overscale, the 2" Minnie traction engine is a good example as just doubleing up gives some rather bulky components.
 
Jason
Thread: darjeeling locomotive
01/08/2010 08:31:35
Well I thought that both Kwil and myself gave an answer as to why decimals may be used although it does not ap[ply in this case.
 
Its a bit much to expect the editor to spend his Saturday and Sunday reading through every post as I'm sure he does not get paid for it, perhaps wait until the beginning of the week to see if he replies. And also have a look back through some of the older posts as the same point has been raised several times in the past and I expect you will find your answer there.
 
Lets just be happy that people are willing to provide these drawings, Asd long as there are no errors I'm happy to work in any measurement or mixture
 
I would think that a narrow gauge loco by its very nature is somewhat top heavy and short wheelbased so thats why adjustments need to be made and they often also ran on tracks with a much smaller turning radius so a bit more "play" between the flange and the track is required if they are not to jam on the rails.
 
The Author also says its is "not unusual" for a narrow gauge loco to to use thicker flanges, so its not just a different standard being used on this loco
 
Jason

Edited By JasonB on 01/08/2010 08:35:05

Edited By JasonB on 01/08/2010 08:40:52

Thread: Small Blower Valves
01/08/2010 08:23:47
I just made mine to the drawings and it works OK, think It may have taken two attempts as I got too much silversolder in it first time round
 
Jason
Thread: darjeeling locomotive
30/07/2010 16:47:49
You must have a different magazine to me as the rear axle is shown at 0.718" and the front at 3/4" . I've always found 0.718" to be smaller than 0.750"
 
The rear axle is LONGER but thats is to suit the cranks and is clearly stated in the first few lines of the axle description as I mentioned above
 
Jason

Edited By JasonB on 30/07/2010 16:49:28

30/07/2010 07:38:36
No I can't see why the dims are fraction & decimal, the only time I would expect it is if the size is not a fractional one and therefor has to be given in decimal. Decimals are sometimes used on fraction drawings where a size is more critical but that does not seem the case here.
 
If you read the first few lines about the axles you will see why the lengths are different.
 
Still it could be worse, the Rena gear drawings have no sizes for the hole on the smaller gear and don't even have a hole shown on the larger one!!. David perhaps you could ammend this as I think you are redrawing this?
 
Most of the ME books such as Model Engineers Handbook give wheel standards, as I say I'm not into locos so can't give you a decent explaination.
 
Jason
29/07/2010 19:32:51
The wheels do not mount onto the 0.531" & 0.468" long ends of the axle, if they did the fit would be a bit loose as they are bored 5/8"
 
Look at the photos, wheels are inboard of the bearings
 
As for the missing 1/32" on the wheel drawing it could be the flange is 5/32" with a 1/32" radius at the base of teh flange where it flows into the tyre, I'm not enough into locos to be sure of this but you should be able to find the details in any table of wheel standards.
 
Jason

Edited By JasonB on 29/07/2010 19:34:19

Edited By JasonB on 29/07/2010 19:51:37

Thread: Extrusion Press
26/07/2010 16:28:27
I would also try to get the same finish, if the 1/35th tank boys can do it then at 1/12 it will be far more noticable. You may just get away with a hacksawn finish to represent the flame cut edges.
 
But you can bet when its finished someone will come along and say "he hasn't even filed the edges"
 
Jason

Edited By JasonB on 26/07/2010 16:28:50

Thread: Suppliers of Copper Boilers
25/07/2010 07:39:31
Helen at Western Steam did the copper boiler for my 2" Fowler.
 
 
Don't know what your thoughts are on welded copper but the people that Maxitrak use are supposed to be able to make welded copper boilers cheaper than silver soldered due to the saving in SS and not having to flange the plates.
 
 
As for steel Boilers then Bell Boilers or Tony Baldwin are both worth a try.
 
Jason
Thread: Building mini machines
24/07/2010 07:38:05
Thats one of the P M Research Models. They do quite a large range as well as workshop fittings so you can make a whole shop complete with overhead line shafting etc.
 
You would be better asking on one of the US forums, I think i have seen a few of teh PMR models on HMEM.
 
I've just ordered a few scale pipe fittings from PM Research and they were dispatched within a couple of hours, just wait to see how long it takes UPS to get them to me and hopefully the value will be below VAt & Import duty levels.
 
Jason
Thread: Suffolk Steam Dredging Tractor
23/07/2010 20:11:58
The one thing with the Dredger is that it uses a steel boiler so unless you are a coded welder it will need to be professionally made (if you want to run in public) so you will have to figure this into your calculations. The good thing is its a lot simpler than a traction engine one so price will not be too bad.
 
A 2" Minnie can be made virtually without castings, maybe just the flywheel and cylinder being bought in and it has a copper boiler which you could make. These will pull a coupel of adults as will the dredger. Also should you run out of money part way through then I feel a Traction engien will be easier to sell.
 
The 3" Little Samson would be another fairly straightforward engine and is just a bit bigger than the 2" minnie. Edwards castings are quite reasonably priced and of good quality. But I think its a steel boiler.
 
Jason
Thread: Ignition coils for small engines
23/07/2010 16:18:53
Posted by Stub Mandrel on 22/07/2010 21:23:29:
I'd love to see articles describing how to make a trembler coil and a magneto in ME. Certainly not covered for 10-20 years?
 
Modl Engine Builder had an article on making a small Mag complete with drawings, you should be able to get back issues.
 
Jason 
Thread: Novice beginner
23/07/2010 15:55:02
So you will have them all rivited up for next months meeting then!!
 
Good to hear you are making progress.
 
Jason

Edited By JasonB on 23/07/2010 15:55:17

Thread: Suffolk Steam Dredging Tractor
22/07/2010 20:13:56
No Problem, you weren't to know what goes on in our pms
 
J
22/07/2010 19:53:38
Well I did put a  next to my comment as it was said tongue in cheek,
 
Chris and I have also exchanged quite a few pms during the build of his Shand Mason fire engine and Northumbrian and I am sure he will know what was meant
 
In fact in on PM he said "a traction Engine would be my ultimate goal"
 
If that is not encouraging him to "Build what he wants to build" then what is?
 
Jason

Edited By JasonB on 22/07/2010 19:56:39

Thread: Reaming Aluminium
22/07/2010 17:43:56
Sounds a lot too fast to me, I would run the reamer at 50-100rpm and prefer parafin to WD40. Also a 3.9mm would give the reamer less to remove so not such a high chance of the swarf build up
 
Jason
Thread: Suffolk Steam Dredging Tractor
22/07/2010 16:59:14
I don't think you need castings for it, even the cylinder block looks like it was made from a lump of CI. There are some pictures of finished ones in Station Road steams Archives, not the nicest thing to look at though. Do the proper thing and make a traction engine
 
Jason
Thread: sourcing worm gears
21/07/2010 20:37:54
Another one you could try is GMB Assoc I've used them when Boston gear parts are spec'd on American model designs. HPC as mentioned above are very good as well.
 
Jason
Thread: Cutting Aluminum Sheet/Plate
19/07/2010 07:24:39
If you do use any form of circular saw blade make sure it has negative rake teeth as the usual (for wood) teeth have positive rake and will tend to draw the metal into the blade.
 
A bandsaw would give a straighter and neater cut than doing it freehand with a jig saw but would still need a light skim with a mill.
 
Jason
Thread: Massey Ferguson Tractor on front cover of ME 4382
18/07/2010 20:10:34
I just looked at the number on the side
17/07/2010 20:41:04
The one thing I will disagree with is the description of the said tractor its a MF 65 not 35.
 
And before anyone assumes i'm a tractor anorack, I'm not its just that one of my clients has just bought a 65.
 
Jason
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