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Rik
Thanks very much for the drawings - very useful.Whk2000 wrote: ↑Tue Aug 16, 2022 6:26 pm I've dug the drawings out to post here, all came from various depths of the internet (as can be seen by the languages on some of them!) I've also attached two photos I find of the same loco in both the roof up and roof down position. I'm slowly doing more research into the type, with the hope of building a model eventually
Oooh, is this the start of another Austro Daimler?! There'll be dozens of them at this rate... You'll have to hurry to beat Philip and Rik though, they work fast...StuartJ wrote: ↑Wed Aug 17, 2022 10:18 amThanks very much for the drawings - very useful.Whk2000 wrote: ↑Tue Aug 16, 2022 6:26 pm I've dug the drawings out to post here, all came from various depths of the internet (as can be seen by the languages on some of them!) I've also attached two photos I find of the same loco in both the roof up and roof down position. I'm slowly doing more research into the type, with the hope of building a model eventually
OK, so I lied!
Probably not - way too many things in the queue already! Always good to have a proper drawing filed away for a rainy day though.Andrew wrote: ↑Wed Aug 17, 2022 1:55 pmOooh, is this the start of another Austro Daimler?! There'll be dozens of them at this rate... You'll have to hurry to beat Philip and Rik though, they work fast...StuartJ wrote: ↑Wed Aug 17, 2022 10:18 amThanks very much for the drawings - very useful.Whk2000 wrote: ↑Tue Aug 16, 2022 6:26 pm I've dug the drawings out to post here, all came from various depths of the internet (as can be seen by the languages on some of them!) I've also attached two photos I find of the same loco in both the roof up and roof down position. I'm slowly doing more research into the type, with the hope of building a model eventually
Not too sure about that, although it would be a nice simple solution. The PS chassis is, as you say, 50mm wb but the drawings suggest 52mm for the prototype - not that I'd argue too much about 2mm
No, you're Ok! Various health issues preclude us all ( 2 + dog) doing very much in the 2nd half of the day so it was welcome distraction, plus the weather has turned now, and after baking with the rest of the country up till a couple of days ago, its now typical Welsh drizzle. In fact we were just debating whether to pack up and go home today rather than wait till tomorrow morning.
That mobile bread bin is about the size of a 20HP Simplex, so it shouldn't be difficult to power it with a modern gear motor drive mounted under the floor. The motor would be on the axle centre line about where the real gearbox is located and the chassis rails would tend to hide the drive details at normal viewing angles.philipy wrote: ↑Thu Aug 18, 2022 11:00 am I've been puzzling about a chassis for it myself, and the only way I can think of, is some sort of very slim motor mounted horizontally under the floor, possibly using spur gears or crown and pinion gears to get at the axles. I've been looking at coreless motors which could probably fit that requirement but they are all high revving and gearing down would be a problem with the space constraints.
Yes, I agree with all you've said and it is roughly what I was thinking. My only reason for looking at something other than the N20 gearmotors is that the one in my "steam powered potting shed "GTB wrote: ↑Thu Aug 18, 2022 3:03 pmThat mobile bread bin is about the size of a 20HP Simplex, so it shouldn't be difficult to power it with a modern gear motor drive mounted under the floor. The motor would be on the axle centre line about where the real gearbox is located and the chassis rails would tend to hide the drive details at normal viewing angles.philipy wrote: ↑Thu Aug 18, 2022 11:00 am I've been puzzling about a chassis for it myself, and the only way I can think of, is some sort of very slim motor mounted horizontally under the floor, possibly using spur gears or crown and pinion gears to get at the axles. I've been looking at coreless motors which could probably fit that requirement but they are all high revving and gearing down would be a problem with the space constraints.
The 6V 50:1 N20 gearmotor and bevel gear final drive that I use in my railmotors, or the N20 with a 50:1 worm gearbox, like the one you used in that steam powered potting shed you built recently, would do the job. Hiding the batteries and an ESC will be harder.
Incidentally, if you magnify the 3rd drawing that was posted, the wheel dia. arrow heads actually touch the wheel tread, not the flange, so commercial metal 20mm wheels would be near enough.
You'd also need to construct a telescopic driver to sit or stand inside ......
I hadn't realised that little engine was so low powered. Does it just sit there and quiver if loaded up, or does it slip and fail to proceed?
The sun made an appearance here today and the wind was from the north, instead of straight off the ice pack, so I did a little test running with my gang motor. It only has single axle drive, but the rail was dry and it managed to haul it's usual trolley, plus the weed killer trucks for a load of eight axles. The results may be of use.
The first major model railway exhibition in Melbourne for 3 years was this weekend and one of the things I saw was a HO scale bike rider furiously pedalling along a road. Nothing is impossible it would seem........
With fully charged batteries it crawls a few yards and then stops and doesn't want to know anymore. I'm thinking the mechanical resistance is such that the motor is not far off stalling all the time,and drains the batteries to quickly.
Thanks for that info. I wouldn't mind seeing gearbox your sketch, please. No point in reinventing the wheel so to speak.GTB wrote: ↑Sun Aug 21, 2022 2:18 pm https://gardenrails.org/viewtopic.php?f=37&t=12453
The gang motor weighs 260g and with the driven axle leading (worst case) managed 34g drawbar pull. The train weighed 663g and had a rolling resistance of 22g. Well within it's capability on my more or less flat track, but it would have slipped to a halt on a 1:50 grade. If both axles were powered, it would have just managed the train on a 1:30 grade.
The gang motor is fitted with a Como 951D601/6V micro gearmotor (I now use Pololu #998 6V 50:1 gearmotors). Gear ratio is 60:1 giving 300rpm at 6V at the output. The final drive is 1:1, using a pair of 0.5mod 20 tooth mitre gears (I now use a pair of 0.5mod 16T mitre gears). The final drive gearbox is milled out of a block of brass, but would probably be possible to print. I can post the back of the envelope sketch I use if needed. I work in 45 mm gauge, but the gearbox is only 21 mm wide so should fit a 32mm gauge wheelset. Probably not enough space left though, to couple the axles by chain for all wheel drive.
The gang motor has 20 mm steel wheels, from IPE I think, leftover from some early Ezee kits before I started turning my own wheels. The battery is 4 x Eneloop cells (4.8V), which gives a scale speed of 11 mph, so a 30:1 gearmotor would give you 20+mph.
Well, many, many years ago, I did create a 4mm farm labourer who bent over and stuck his pitchfork into a pile of hay ( chopped sisal string) and then heaved it up on to the top of a threshing engine. Sadly it was before the days of commonly available video so I only have one slightly fuzzy still photo, but it kept the exhibition punters fascinated for hours, especially the kids! He was operated by a fairly complex cam mechanism which bent him over, pulled his arms back and jabbed down, then flicked back up!GTB wrote: ↑Sun Aug 21, 2022 2:18 pm The first major model railway exhibition in Melbourne for 3 years was this weekend and one of the things I saw was a HO scale bike rider furiously pedalling along a road. Nothing is impossible it would seem........
I think it would be possible to use a couple of the miniature linear rc servos used by aeromodellers (look on ebay) and some sort of linkage to raise the roof. They don't take up a lot of space, but seem to be powerful, a friend uses them to operate signals in HO.
Working out how to animate the driver to walk up, open the door and lift the roof might be a bit more of a challenge.......
Herewith, one photo and one back of the envelope pencil sketch. This is the nearest I ever get to doing a drawing, it's basically just to remind me of the dimensions when machining.
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