weary
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Post by weary on Sept 5, 2010 9:25:56 GMT
5" gauge 'Tich' maybe?
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weary
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Post by weary on Aug 18, 2010 18:14:48 GMT
When I had some chrome to strip (motorcycle fittings) I took the pieces to a commercial chrome plater. They stripped them free of charge as it adds chrome to their bath and carried it out while I waited. If the pieces are suitably sized it may be worth exploring this option.
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weary
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Post by weary on Jul 22, 2010 18:34:56 GMT
My recollection and notes of carrying this out on my Tich is that I made the springs of 22 gauge wire (as per my edition of 'The Tich Book' page 30). This made overall diameter of spring 4.6mm; No.20 hole was 4.1mm; and I entered each spring into the appropriate hole ('pocket') in the axlebox with a (left-handed) screwing action which meant that the spring is retained affixed to the axle-box.
This seems to have worked nicely for me with a 'standard' Tich.
If you need heavier gauge wire to cope with the additional weight (maybe) inherent in your design then I suggest that you increase the hole size in the axlebox to provide an appropriate interference fit to retain the spring in a similar way.
Best of luck with your project.
Regards,
Phil
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weary
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Post by weary on Jun 8, 2010 18:39:36 GMT
For those looking for slightly thicker Aerogel mat, it is available on ebay, normally listed under car parts and accessories as it is used for exhaust etc. insulation. Costs about nineteen pounds per square foot for 6mm thick.
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weary
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Post by weary on Apr 25, 2010 10:29:19 GMT
Tich Sheet 12, Stephenson's Link Valve Gear Belpaire Boiler, is a normal Nexus print, but the copy that I have is very much an additional sheet and not up to the standard of the other drawings in the set. It shows some of the variations in Tich that feature in the version that LBSC built for his own use; the major changes being as listed on the sheet title: Belpaire firebox and Stephenson's valve gear.
The locomotive is pictured in the first photo' in the edition of 'The Tich Book' that I have, opposite page 9, though there are neither drawings of, nor reference to, it in the text.
Dave, I have sent you an additional PM.
Phil
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weary
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Post by weary on Apr 21, 2010 19:19:43 GMT
TICH, sheet 12, has drawings of a small Belpaire boiler, 3.5" gauge. Depends what size you are looking for, but may be OK as a basis(?)...... Drawn diameter 2 5/8", overall length 7.5", firebox inner 2.5" long x 2.25" wide
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weary
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Post by weary on Mar 16, 2010 20:24:48 GMT
Andrew, I think that they are asking whether this particular locomotive model was built by B Terry Aspin (pen-name when drawing cartoons & sometimes for articles:- Chuck; 'catchphrase' used as magazine article title:- 'Build 'em Big')
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weary
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Post by weary on Mar 10, 2010 19:02:31 GMT
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weary
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Post by weary on Mar 2, 2010 13:22:12 GMT
With a good master surface I have used the following with success: Graphite powder: brush on, very gently 'tap-off' surplus. (Colours resin though) 5-7% Vaseline (or similar petroleum jelly) in White Spirit. Make up as follows (before the H&S boys flame me - warning do not try this at home!): Stand white spirit and vaseline container in hot water, as vaseline disolves stir in. Brush onto master and leave to dry (few mins in warm area). Obviously the objective is to simply leave an extremely thin layer of vaseline, the white spirit is simply a carrier. You can increase the amount of vaseline if you have any doubts, just makes it harder to brush on, I have found that kind of volume mix OK, but you can always experiment as it is so cheap and easy. Afterthought: Might affect setting of resin - I normally use rubber for moulding, but seem to vaguely recall using this for resin on ocassion - suggest you test apply and try. You can buy pukka spray-on release agents, I get mine from Alec Tiranti, because it is convenient for me, there are many other sources. Tiranti will give you advice over the 'phone no problem as they employ artists in their shops. www.tiranti.co.uk/
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weary
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Post by weary on Feb 10, 2010 9:34:44 GMT
Thanks for your reply and recommendation. I had been thinking of purchasing the AMBSC Code, but will now definitely get a copy. From the 'reviews' on this and other sites it is a 'real page turner that will keep me hooked right to the very last word!'.
Some aspects of model boiler design parameters seems very poorly covered in the Model Engineering Press, even the 'standard texts' are vague on some points.
Having had a look at a number of published boiler designs I have a few ideas of the reasons for this vagueness and also of some of the 'rules of thumb' that seem to be used - but was hoping that there might be a text that clarified things.
(This topic would make a nice brief article in ME. However I suspect that it would have to be an edited article with the various published designers giving their thoughts and methods of calculation anonymously.)
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weary
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Post by weary on Feb 8, 2010 15:16:28 GMT
Can anyone suggest authoritative texts that have calculations or detailed explanations relating to the design, sizing (thickness of stay & width of 'feet' etc.), and positioning (number and location across or along the firebox), of Firebox Crown Girder or Plate Stays for copper boilers in our, model, sizes?
I am also interested in empirical data and calculations comparing the support given by girder or plate stays connected to, and those not connected to, the outer boiler wrapper, and the effect on strength /support of piercing these stays to improve water circulation.
Clearly the above also applies to girder or plate stays on other surfaces such as backheads, tube-plates, etc.
Any suggestions or recommendations of general model boiler design texts are also of interest.
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weary
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Post by weary on Jan 28, 2010 23:32:26 GMT
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Post by weary on Jan 7, 2010 19:11:00 GMT
Dennis, I have dropped you a PM. Phil
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weary
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Post by weary on Dec 30, 2009 20:27:55 GMT
For 0.5" shaft: Drive fit shaft = 0.5" + 0.24 thousandths of an inch Force fit shaft= 0.5" + 0.625 thousandths of an inch Shrink fit shaft = 0.5" + 1.0 thousandth of an inch
Source: Model Engineer's Handbook 3rd edition. Tubal Cain
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weary
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Post by weary on Dec 17, 2009 16:10:55 GMT
French model engineers seem to use stainless steel boilers without problems. Here is a link to a thread on the forum of the primary French National Model Engineering Society on the topic. If it only gives the first page a search chaudiere inox within the topics will find some suitable recommendations. www.cav-escarbille.com/forum.htm
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weary
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Post by weary on Nov 10, 2009 10:47:52 GMT
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Post by weary on Nov 5, 2009 19:52:53 GMT
I get my Sulphuric Acid from a car parts shop (they also sells batteries). The acid comes in one litre plastic bottles and is 37% strength. Marketted under the name 'Banner'.
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weary
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Post by weary on Sept 25, 2009 8:36:55 GMT
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weary
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Post by weary on Sept 5, 2009 17:47:07 GMT
I have sent you a 'Personal Message'.
Regards, etc.
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weary
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Posts: 290
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Post by weary on Aug 18, 2009 9:23:05 GMT
I have just measures an upper quadrant BR stop signal arm that I have. It is made from 2mm pressed steel subsequently enamelled, marked BR and GARNIER 1/70 (in different places) Enamelled Arm Dimensions: Length: 1060mm Width: 260mm Stiffening Folds at each long edge are 25mm deep Front face white band 282mm wide with nearest edge 316mm from end; reverse has black band in same position. Front face overall colour red, reverse overall colour white, but note that stiffening folds are red on inside on reverse too, that is only the surface which would be vertical is painted white.
Held to spectacle plate with five bolts, but am guessing that this varies depending on exact type of spectacle plate used.
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