uuu
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Post by uuu on May 1, 2020 12:28:48 GMT
I don't see a slot. I interpret the 1/2" as being the spacing of the top fixing holes. If there were a slot, you'd not have 8 bearing fixing holes.
Wilf
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uuu
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Juliet
May 1, 2020 12:14:16 GMT
Post by uuu on May 1, 2020 12:14:16 GMT
I don't think so. I think it's just the fixings holding it. I've got this from their kit instructions - just reading them for amusement.
Wilf
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Juliet
May 1, 2020 10:25:20 GMT
Post by uuu on May 1, 2020 10:25:20 GMT
I'm quite fond of Station Road Steam's approach on their "Stafford" loco. All except the rearmost horn have elongated fixing holes. So you do the back horn up first. Then the back axle goes in, and its front horn is adjusted for a nice fit. then the front axle in, with the coupling rods - and its horns are adjusted until it all goes round.
Wilf
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uuu
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Post by uuu on May 1, 2020 9:19:33 GMT
I may be miscalculating, but the trunnion has oversized holes, for the separate and removeable bearings. I suspect that you can thread one end of the brake shaft through one hole (from the inside) and then align it with the other hole. Then when you fit the bearings (from the outside) they keep everything in place. I think that's why the shoulders of the brake shaft are rounded. I seem to remember there's something similar with the brake shaft on Pansy. But the body of the pivot assembly at 11/16", plus one shaft end at 11/32" (the other shaft end is in the hole) adds up to 1 1/32", which you're trying to swing into a 7/8" gap. You might gain a bit with the shoulder going into the hole, but it feels too tight. Wilf Edit. I've sketched it out - I don't think it fits. BrakeTrunnionQuestion by Wilf, on Flickr
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uuu
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Post by uuu on May 1, 2020 9:15:06 GMT
I'm going to ask a contrary question: Why is the body of the pivot assembly so narrow?
Given that the bearing fixing holes are tapped, I'm supposing the bearings are fitted from the outside. So if they have 1/8" flanges, it answers Roger's question - 7/8" spacing of the trunnion plates, plus two times 1/8" plate thickness, plus two 1/8" bearing flanges matches the 1 3/8" shaft.
But the pivot assembly is only 11/16" wide flapping about in the 7/8" gap. Unless the bearings project into the space, but they only have 1/16" wall thickness.
Wilf
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uuu
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Post by uuu on May 1, 2020 7:57:53 GMT
Having seen many locos coming to the Pumphouse for attention, if the wheels go round smoothly you're ahead of the field.
Wilf
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uuu
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Post by uuu on May 1, 2020 7:50:45 GMT
So I'm arguing that, fitting a big superheater, then arguing that the valve materials do not need to be high temperature rated, the oil supply does not have to be atomising, the loco is not going to be used on the main line at 100mph, but nevertheless the oil is going to be the thickest available, is just not a balanced position.
Wilf
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Post by uuu on May 1, 2020 6:21:10 GMT
I like Jessie. Well I would say that, since it's the loco I'm (very slowly) building. I need to chase you a bit (only a little) to catch up - I too have the boiler and cylinders done, but need to finish the axleboxes to have a rolling chassis. I too have been selecting bits from the drawings and making them, so at the appropriate time I can appear to surge ahead as little add-ons appear from hidden boxes.
I'm looking forward to following your progress.
Wilf
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Post by uuu on Apr 30, 2020 20:46:40 GMT
That's 180 psi, plus superheat, not 180 degrees. Have a look here for a range of steam oils HallettWilf
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uuu
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Post by uuu on Apr 30, 2020 18:06:35 GMT
....I don't think you have much choice but to use Steam Oil that's specifically formulated for that purpose... Yes - but as with motor oil, it comes in different grades. Wilf
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uuu
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Post by uuu on Apr 30, 2020 15:57:20 GMT
Do some people use oil that's too thick? So it doesn't spread out much, much less "atomise".
Wilf
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uuu
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Post by uuu on Apr 30, 2020 6:29:24 GMT
Yes: Fran 7.25 by Kenneth Lindeman, on Flickr When you're looking at the photo on Flickr, there's a curved arrow symbol, bottom right. Click on that and a dialog box pops up. Choose "BBCode" from the list at the top, then use the drop-down to choose a picture size. I've gone for medium 640x330 here. Then copy the resulting code and just paste it in here. Just paste, no need to choose any proboard options. Wilf
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uuu
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Post by uuu on Apr 29, 2020 12:09:24 GMT
Not sure where the original author of this thread sourced his frames, but it's a good bet it was Model Engineers Laser. Click on this link for their Scamp page: Model Engineers Laser siteDo please keep us posted with your progress. Wilf
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uuu
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Post by uuu on Apr 28, 2020 19:55:35 GMT
Make one of each so you can swap them and see if anyone notices.
Wilf
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uuu
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Post by uuu on Apr 28, 2020 19:04:25 GMT
Cast iron, anyone?
Wilf
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Post by uuu on Apr 28, 2020 6:09:08 GMT
It's clearly no longer any old loco: it's your loco. So I think the satisfaction of running it will be all the greater.
Wilf
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Post by uuu on Apr 26, 2020 12:20:23 GMT
On the first design, I wonder why the square support for the whistle lever needs to be separate. If you're making the whole thing from square stock, then having it as one continuous part avoids the risk of the two 1/16" holes failing to line up.
Unless you're going to put a little o-ring in.
Wilf
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Post by uuu on Apr 26, 2020 12:11:37 GMT
I just have a feeling I'd like to see all openings of the boiler guarded by a clack or valve directly on the boiler. Have another clack remotely by all means, but don't miss out the close-up one.
Now I don't know if this thought is backed up by any rule or best-practice statement - it just feels like a safe approach.
Wilf
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uuu
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Post by uuu on Apr 24, 2020 18:27:58 GMT
Chewing gum?
Wilf
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Post by uuu on Apr 24, 2020 18:16:03 GMT
I've used "Plastic metal" which is a two part filler in two tubes, so you'll make more than you use. Not so much between coats, but as a repair/initial smoothing fill. It's reasonably quick setting, but maybe not as fast as you'd like. Probably best used as a fill-then-sand process, but for small screw heads a quick smear would probably work.
My packet was really old - recently chucked when it failed to set. "Good for repairing asbestos" it said - "file open small cracks for better adhesion".
Wilf
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