RMweb Gold griffgriff Posted October 27, 2014 RMweb Gold Share Posted October 27, 2014 Hi. I have a query that I'd like to raise regarding 1/108 clasp braked minerals (namely brake gear fitment and in particular how to model them in 4mm using the Ambis etch WV6_4). Are the brake cylinders on these wagons (clasp braked MCVs) the same size? The Ambis information suggests cylinders of different sizes. I have never seen any mention of this before. Thanks in advance. Rob Griffiths (griffgriff) Link to post Share on other sites More sharing options...
Fat Controller Posted October 27, 2014 Share Posted October 27, 2014 Hi. I have a query that I'd like to raise regarding 1/108 clasp braked minerals (namely brake gear fitment and in particular how to model them in 4mm using the Ambis etch WV6_4). Are the brake cylinders on these wagons (clasp braked MCVs) the same size? The Ambis information suggests cylinders of different sizes. I have never seen any mention of this before. Thanks in advance. Rob Griffiths (griffgriff) They are of different sizes, but what these are, I don't know. The smaller one is for an Empty wagon, the larger one for a Loaded one; there's a small change-over lever on the solebar. This shot from PB might be of use:- http://paulbartlett.zenfolio.com/brmineralclaspvb/h6e19880e#h6e19880e Link to post Share on other sites More sharing options...
RMweb Gold griffgriff Posted October 27, 2014 Author RMweb Gold Share Posted October 27, 2014 They are of different sizes, but what these are, I don't know. The smaller one is for an Empty wagon, the larger one for a Loaded one; there's a small change-over lever on the solebar.* This shot from PB might be of use:- http://paulbartlett.zenfolio.com/brmineralclaspvb/h6e19880e#h6e19880e Thanks for that. I found that photo and did try to ask PB about it as I couldn't make out a size difference. As I said the Ambis instructions are the only place I have found mention of this but they don't say what cylinders to use. *PS I am only really interested in the mainstream MCVs with the CO lever not the mythical (rarer ones?) that had SAB brakes. Link to post Share on other sites More sharing options...
RMweb Gold griffgriff Posted October 28, 2014 Author RMweb Gold Share Posted October 28, 2014 I have some ABS cylinders that I shall measure and I will determine the size of the cylinders intended for the Ambis etches. Should this be in the modelling section I wonder? Perhaps when I start the modelling bit so here it should stay - while I remain in the armchair at least (just thinking aloud) Link to post Share on other sites More sharing options...
RMweb Premium Grovenor Posted October 28, 2014 RMweb Premium Share Posted October 28, 2014 See Modellers Back Track Vol 1 No 5. There is a photo of the underside clearly showing the unequal cylinders. There was a 15" cylinder for the empty condition and an 18" cylinder that was added for the loaded condition. ie Loaded used both. Keith Link to post Share on other sites More sharing options...
Poor Old Bruce Posted October 28, 2014 Share Posted October 28, 2014 See Modellers Back Track Vol 1 No 5. There is a photo of the underside clearly showing the unequal cylinders. There was a 15" cylinder for the empty condition and an 18" cylinder that was added for the loaded condition. ie Loaded used both. Keith It should be noted that the sizes given are the piston diameter. The outside of the drums would be four to six inches (not sure off hand) bigger. Link to post Share on other sites More sharing options...
RMweb Gold griffgriff Posted October 28, 2014 Author RMweb Gold Share Posted October 28, 2014 See Modellers Back Track Vol 1 No 5. There is a photo of the underside clearly showing the unequal cylinders. There was a 15" cylinder for the empty condition and an 18" cylinder that was added for the loaded condition. ie Loaded used both. Keith Indeed Ambis referenced the Modellers Back Track article but alas I must have left my copy in the shop Link to post Share on other sites More sharing options...
RMweb Gold griffgriff Posted October 28, 2014 Author RMweb Gold Share Posted October 28, 2014 It should be noted that the sizes given are the piston diameter. The outside of the drums would be four to six inches (not sure off hand) bigger. surely even 4'' bigger would make the thickness of the drum 2''? They wouldn't be solid then? If they were then that would make them impossibly heavy wouldn't it? Link to post Share on other sites More sharing options...
Poor Old Bruce Posted October 29, 2014 Share Posted October 29, 2014 surely even 4'' bigger would make the thickness of the drum 2''? They wouldn't be solid then? If they were then that would make them impossibly heavy wouldn't it? The drum is not solid. The vacuum 'reservoir' is anular in shape surrounding the vacuum cylinder. see http://en.wikipedia.org/wiki/Vacuum_brake Link to post Share on other sites More sharing options...
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