Search found 3112 matches

by gwrdriver
Thu Feb 20, 2020 9:07 pm
Forum: Live Steam
Topic: BR55/G8.1 Locomotive Project
Replies: 48
Views: 11887

Re: BR55/G8.1 Locomotive Project

Conventional, . . not standard. "Conventional" would be a fabricated manifold from which pairs of superheater tubes (in and back) would be connected. There would be a different manifold/superheater tube arrangement for every different locomotive design. There would be many superheater assemblies whi...
by gwrdriver
Thu Feb 20, 2020 5:29 pm
Forum: Live Steam
Topic: Appropriate tip for Ball oilers?
Replies: 9
Views: 2381

Re: Appropriate tip for Ball oilers?

My lathe came with a similar pump, although it's design causes it to leak out if left laying on it's side, making it more trouble (and mess) than it's worth. For pump oilers, no "nubbins" are needed . . . the hydraulic pressure of the oil will displace the ball, but occasionally quite a bit of press...
by gwrdriver
Thu Feb 20, 2020 1:43 pm
Forum: Live Steam
Topic: BR55/G8.1 Locomotive Project
Replies: 48
Views: 11887

Re: BR55/G8.1 Locomotive Project

I expect to use conventional S'heater elements so I'd expect there would be four.
by gwrdriver
Wed Feb 19, 2020 7:34 pm
Forum: Live Steam
Topic: BR55/G8.1 Locomotive Project
Replies: 48
Views: 11887

Re: BR55/G8.1 Locomotive Project

Ian, Here are the photos of my smokebox arrangement, and for starters my boiler is 6" diam copper. The first photo shows the mounting studs, 3 x .250" C510 phosphor bronze at 120°, and will be silver soldered into the front tube plate. The retainer plate is milled mild steel and fits within a recess...
by gwrdriver
Wed Feb 19, 2020 2:42 pm
Forum: Live Steam
Topic: BR55/G8.1 Locomotive Project
Replies: 48
Views: 11887

Re: BR55/G8.1 Locomotive Project

Ian, There are two options to consider - one is to affix the boiler (a solid connection) to the frame at the firebox end. If that's done then some allowance for expansion and contraction will have to be made at the smokebox end, keeping in mind the smokebox must essentially be air-tight. The second ...
by gwrdriver
Wed Feb 05, 2020 9:21 am
Forum: Live Steam
Topic: LBSC Virginia plans
Replies: 68
Views: 25527

Re: LBSC Virginia plans

One of the interesting things about LBSC is that while he designed something like 100 locomotives, he built around 50. [snip]. How many people do you know that could do a complete working design and write an article on construction without having take one to completion? - Steve Steve, It wasn't all...
by gwrdriver
Mon Feb 03, 2020 10:55 pm
Forum: Live Steam
Topic: Necessity of hardened crank pins on 3/4” scale
Replies: 49
Views: 11076

Re: Necessity of hardened crank pins on 3/4” scale

You could say (in my example), the design and material specification were modified when it was determined they it did not result in the desired performance. His next four (or more) locomotives performed as desired.
by gwrdriver
Mon Feb 03, 2020 6:36 pm
Forum: Live Steam
Topic: Necessity of hardened crank pins on 3/4” scale
Replies: 49
Views: 11076

Re: Necessity of hardened crank pins on 3/4” scale

Machining to tenths of thousandths of an inch should not be required at all. But it can be nice, if possible. I usually aim for .0005" at the best, where it can help operation. Especially with press fits. Other builders may choose looser tolerances, with success. RussN Good advice. I learned this f...
by gwrdriver
Mon Feb 03, 2020 4:57 pm
Forum: Live Steam
Topic: Calling Marty Knox
Replies: 16
Views: 3964

Re: Calling Marty Knox

My thinking is this occurred while it was having extreme localized overheating, which could have been caused by several things, the obvious reasons (low water, too much fire, etc), and as Marty mentions a buildup of scale which prevented water from reaching the area. I doubt it was an over-zealous t...
by gwrdriver
Mon Feb 03, 2020 2:10 pm
Forum: Live Steam
Topic: steam/exhaust port sizing
Replies: 4
Views: 1827

Re: steam/exhaust port sizing

The reason long narrow ports were historically preferred were that they require less valve travel to open (or close) a given port area. That also means the valve gear can be made more compact as it doesn't have to create as much travel.
by gwrdriver
Thu Jan 30, 2020 6:12 pm
Forum: Buy, Sell, Trade, Wanted, Free!
Topic: WTB - R-8 x 7/8" collet
Replies: 3
Views: 2088

WTB - R-8 x 7/8" collet

Looking for a 7/8" R-8 collet, to buy or trade.
by gwrdriver
Tue Jan 28, 2020 9:40 am
Forum: Live Steam
Topic: Refractory Brick
Replies: 8
Views: 2226

Re: Refractory Brick

Ahhh . . nothing like the smell of incinerated pepperoni while soldering! (Hold the anchovies.)