Sophia NSE Posted April 9, 2022 Author Share Posted April 9, 2022 I have a spare pair of duckets from a Ratio LNWR coach kit and we have a few 4 wheel coaches at the shop, so a brake conversion is very likely 4 Link to post Share on other sites More sharing options...
RMweb Premium Annie Posted April 9, 2022 RMweb Premium Share Posted April 9, 2022 All good fun. The 4 wheel coaches certainly look more plausible as a short bogie coach than they do as 4 wheelers. 3 Link to post Share on other sites More sharing options...
Sophia NSE Posted April 9, 2022 Author Share Posted April 9, 2022 I'm thinking maybe 6 wheelers 2 Link to post Share on other sites More sharing options...
RMweb Premium Annie Posted April 9, 2022 RMweb Premium Share Posted April 9, 2022 55 minutes ago, Sophia NSE said: I'm thinking maybe 6 wheelers Nice, very nice. 🤩 1 1 Link to post Share on other sites More sharing options...
Sophia NSE Posted April 10, 2022 Author Share Posted April 10, 2022 The station master's house and garden are ready to be glued in as No 12 brings an afternoon service into Chart Sutton 11 Link to post Share on other sites More sharing options...
Sophia NSE Posted April 11, 2022 Author Share Posted April 11, 2022 The station master's garden now has a wall 11 Link to post Share on other sites More sharing options...
RMweb Gold Oldddudders Posted April 11, 2022 RMweb Gold Share Posted April 11, 2022 This is beginning to look suitably Rowland Hilder Wealden. An oast, either 2- or3-dimensional, would seal it. 6 Link to post Share on other sites More sharing options...
Sophia NSE Posted April 16, 2022 Author Share Posted April 16, 2022 Time for a little brake The duckets have been liberated from a Ratio LNWR coach kit that didn't require them 9 Link to post Share on other sites More sharing options...
Sophia NSE Posted April 21, 2022 Author Share Posted April 21, 2022 Forgot to mention last Friday's purchase Wrong livery and some terrible weathering but some T-Cut and a couple of coats of paint have fixed that 14 Link to post Share on other sites More sharing options...
whart57 Posted April 25, 2022 Share Posted April 25, 2022 On 21/04/2022 at 19:21, Sophia NSE said: Wrong livery and some terrible weathering but some T-Cut and a couple of coats of paint have fixed that Weathering was so bad I thought it was on the outside of the plastic box. Good rescue job. 3 Link to post Share on other sites More sharing options...
Sophia NSE Posted April 27, 2022 Author Share Posted April 27, 2022 Oh look, another loco to repaint and renumber! This will become No. 5 with exposed splasher brass as seen in the Russell book on Southern locos 9 Link to post Share on other sites More sharing options...
Artless Bodger Posted April 27, 2022 Share Posted April 27, 2022 Looks lovely in the SR green, shame to repaint it but kudos for sticking to the period modelling. Look forward to seeing the completed job. I remember seeing one of these in the Tonbridge bay at Maidstone West, the L shaped brake handle sticks in my memory - must have been all of 3 y.o. at the time. 6 Link to post Share on other sites More sharing options...
Sophia NSE Posted May 4, 2022 Author Share Posted May 4, 2022 Chart Sutton's loco line up And a close up of the H class in its new (old) livery 16 1 Link to post Share on other sites More sharing options...
Sophia NSE Posted May 15, 2022 Author Share Posted May 15, 2022 Had the layout out for a play and the H is an absolutely fabulous loco, running very well on my track. The C ran pretty well too. I'd best get around to a fiddle yard soon! 13 Link to post Share on other sites More sharing options...
Sophia NSE Posted May 25, 2022 Author Share Posted May 25, 2022 (edited) Here's what I did at work today! DCC chipping a Hornby pocket rocket. Photo taken by the boss 😁 Also a little something for a new project Edited May 25, 2022 by Sophia NSE Extra picture 11 Link to post Share on other sites More sharing options...
Sophia NSE Posted June 8, 2022 Author Share Posted June 8, 2022 Things have progressed rather! https://youtu.be/TeYq0K2mzKU 5 3 Link to post Share on other sites More sharing options...
whart57 Posted June 11, 2022 Share Posted June 11, 2022 On 25/05/2022 at 20:35, Sophia NSE said: Also a little something for a new project That's an interesting looking gearbox Link to post Share on other sites More sharing options...
Sophia NSE Posted June 12, 2022 Author Share Posted June 12, 2022 On 11/06/2022 at 16:28, whart57 said: That's an interesting looking gearbox It's an N20 motor 1 Link to post Share on other sites More sharing options...
whart57 Posted June 12, 2022 Share Posted June 12, 2022 58 minutes ago, Sophia NSE said: It's an N20 motor I thought that is what it looked like. I didn't know you could get them so they drive the wheels directly. I use them but with a crown and pinion for the final drive. I must investigate 1 Link to post Share on other sites More sharing options...
wainwright1 Posted June 13, 2022 Share Posted June 13, 2022 13 hours ago, whart57 said: I thought that is what it looked like. I didn't know you could get them so they drive the wheels directly. I use them but with a crown and pinion for the final drive. I must investigate I am looking at using some of these to drive working model buses. The ones I have got will run on 1.5 volts, but have a 3mm drive shaft at the end which also has a flat on it. I have acquired some bevel gears which also have 3mm holes for the final drive to the bus axle. The only problem is that the final drive shaft is too long, I need to loose about 50% of it and they are made of bloody hard stuff. A saw will not touch it, so I am contemplating a cutting disc in a mini drill, doing a little at a time to avoid it getting hot and damaging the bearing. All the best Ray 2 1 Link to post Share on other sites More sharing options...
whart57 Posted June 13, 2022 Share Posted June 13, 2022 (edited) 20 minutes ago, wainwright1 said: I am looking at using some of these to drive working model buses. This is how I've done one. Admittedly I turned the wheels - with 2mm shaft - on the lathe and then fitted the tyres that were on the original plastic centres. The motor is a nominal 3v job and the power comes from a LIPO battery. It's radio controlled and that all works. It's the other end where I still need to get either a Faller front axle sorted for the wider 4mm scale track or fabricate one that has caused the hiatus in progress. Shortening he drive shaft with a cutting disk works. Slow progress with pauses for cooling down is sensible though on the motors I've worked with the bearings have been brass so are proof to a bit of heat. Sorry to all for the bit off topic here. Edited June 13, 2022 by whart57 3 1 Link to post Share on other sites More sharing options...
whart57 Posted June 13, 2022 Share Posted June 13, 2022 17 hours ago, Sophia NSE said: It's an N20 motor Or more specifically an N20 motor with double shaft. I've found some on Amazon now, but a question. They come in different speeds. I'm guessing the 95-381rpm would be the one for small wheeled locos with the 34-136rpm for large wheels. What do you think? Link to post Share on other sites More sharing options...
wainwright1 Posted June 13, 2022 Share Posted June 13, 2022 3 hours ago, whart57 said: This is how I've done one. Admittedly I turned the wheels - with 2mm shaft - on the lathe and then fitted the tyres that were on the original plastic centres. The motor is a nominal 3v job and the power comes from a LIPO battery. It's radio controlled and that all works. It's the other end where I still need to get either a Faller front axle sorted for the wider 4mm scale track or fabricate one that has caused the hiatus in progress. Shortening he drive shaft with a cutting disk works. Slow progress with pauses for cooling down is sensible though on the motors I've worked with the bearings have been brass so are proof to a bit of heat. Sorry to all for the bit off topic here. That looks interesting. Where did you get the gears from ? For the steering units, try KKPMO. "1:87 steering mechanism LKW-POM 20mm axle." Price: £7.00. This is a bit wider than the Faller units, and it comes in kit form. Available from DCC Train Automation. All the best Ray Link to post Share on other sites More sharing options...
RMweb Gold Regularity Posted June 13, 2022 RMweb Gold Share Posted June 13, 2022 1 hour ago, whart57 said: Or more specifically an N20 motor with double shaft. I've found some on Amazon now, but a question. They come in different speeds. I'm guessing the 95-381rpm would be the one for small wheeled locos with the 34-136rpm for large wheels. What do you think? Rough and ready calculation… With 60” (5’) wheels going at 60 mph, the axle will be revolving at 280 rpm. with 30” wheels, an axle rpm of 280rpm produces 30 mph. I.e. speed in MPH = driving wheel diameter in inches x 280 rpm. Since engines with larger wheels were designed to go faster, and certainly through most of the 19th century the biggest limitation on speed was driving wheel RPM (due to piston speeds, and the ability of bearings/glands for wheels and cylinders to cope with much above 300 RPM, or probably even close to it in the early days), then you can use one ratio for everything, unless you want something to go particularly slowly (or faster). Also, the speeds quoted are the maximum “no load” speeds, so it is useful - but not essential - to work at about 75% of that most of the time. Long story short, the 381 rpm will work very well for virtually anything, including a bit of high speed running every now and again (a Stirling single at 380 rpm will just about exceed Mallard’s record!) but if you only have a short run and never get up to full throttle, you can always go for something slower. Remember that the driving wheels are used as part of the trade-off between tractive effort and speed on the real thing, so are part of the “gearing” mechanism on the prototype. Also, if you have an independent final drive, then in the unlikely event of a mechanism failure, you can simply replace it with a new one without having to remove the wheels. 2 1 Link to post Share on other sites More sharing options...
whart57 Posted June 14, 2022 Share Posted June 14, 2022 I think the maths is a little awry here. 60 mph is one mile per minute, or 5280 feet per minute. The circumference of a 5' diameter wheel is 5 x π or 15.7'. So the rotation speed of a 5' driver at 60 mph is 336 RPM. It's probably more useful to consider 30 mph the top speed of a steam engine of the sort most of us run. So that would be half that or 168 RPM. The loco I have in mind though has 4' drivers and is unlikely to go faster than 25 mph. I think the equations are: RPM = distance covered in minute/circumference of driving wheel or Distance (feet) = RPM x wheel diameter (feet) x π Distance in feet = Speed (mph) x 5280 / 60 = Speed (mph) x 88 Speed (mph) = RPM x wheel diameter (feet)/28, 28 being approximately 88/π So with 4' drivers 34 RPM equates to 4.8 mph, a brisk walking pace and 136 RPM equates to 19.4 mph. On the faster motor with 4' drivers 95 RPM would equate to 13.5 mph and 381 RPM would equate to 54.4 mph. Now one problem is that scale speed might not be so easily determined. Even so it would seem that 136 RPM is still too low a top speed. However I'm likely to fit DCC or if not use a pulse controlled supply so the bottom RPM could be made slower. I think the 95-381 RPM is the one I want. Do others agree? 1 Link to post Share on other sites More sharing options...
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