Search found 823 matches

by RET
Sat Jan 11, 2020 9:00 am
Forum: Live Steam
Topic: Union Pacific Big Boy in 3/4 Inch Scale
Replies: 119
Views: 45572

Re: Union Pacific Big Boy in 3/4 Inch Scale

Hi Rich, I still have to look and see what I have in the CAD files for Big Boy. What I do is to put multiple parts on one drawing and draw what I need rather than make individual drawings for parts. I'm drawing for myself, not for publication so what's the point of making formal drawings? To give yo...
by RET
Wed Jan 08, 2020 9:29 pm
Forum: Live Steam
Topic: Union Pacific Big Boy in 3/4 Inch Scale
Replies: 119
Views: 45572

Re: Union Pacific Big Boy in 3/4 Inch Scale

Hi Rich, Yes, there will be more posts. As I said way back there somewhere, I only post to this thread once in a while. At the moment, I'm working on the boiler top feed assembly, In particular I'm making hold down clamps for a vise to go on the CNC mill to hold the two top covers for the top feed. ...
by RET
Wed Jan 08, 2020 8:21 pm
Forum: Build Log
Topic: Front End Rebuild
Replies: 18
Views: 1915

Re: Front End Rebuild

Hi Glenn, Sorry to rain on your parade, but if I were doing it, I would take the smoke box off and join the two cylinder exhausts together below it, thus winding up with something like the set up in the Boston & Albany with a single blast pipe that is aligned with the stack. The two cylinder exhaust...
by RET
Sat Jan 04, 2020 2:50 pm
Forum: Live Steam
Topic: Never seize in lieu of pipe dope
Replies: 32
Views: 1843

Re: Never seize in lieu of pipe dope

Hi Glenn, For pipe threads, I use teflon tape. It doesn't take a lot and it works. I custom make a lot of my fittings. That way I can fit them into smaller spaces and they look better. Custom made superheater headers, internal smokebox piping, all of these will benefit from a custom design. I don't ...
by RET
Fri Jan 03, 2020 2:29 pm
Forum: Live Steam
Topic: Run out of steam pressure after 100 feet
Replies: 40
Views: 6542

Re: Run out of steam pressure after 100 feet

Hi Nick, The first thing you need to know is that to be able to seal flat surfaces like a steam chest without using a gasket of some kind (paper, plastic, silicone seal, etc.) the surface not only has to appear flat and smooth, it actually has to BE flat and true the way water would be if you took a...
by RET
Wed Jan 01, 2020 9:07 am
Forum: Live Steam
Topic: Run out of steam pressure after 100 feet
Replies: 40
Views: 6542

Re: Run out of steam pressure after 100 feet

Hi Nick, A lapping plate may or may not be truly flat depending on how it has been used or even how the surface was when the plate was new. It works by being soft enough that the grit in the compound embeds in the surface of the plate. For sealing without gaskets, it is the flatness that you need. A...
by RET
Tue Dec 31, 2019 9:42 am
Forum: Live Steam
Topic: Run out of steam pressure after 100 feet
Replies: 40
Views: 6542

Re: Run out of steam pressure after 100 feet

Hi Nick, Good job, sounds perfect! Because of thermal expansion, you might have to make a few minor tweaks when you run it on steam, but you have done a great job. Congratulations on sticking with it. Now you know the satisfaction you get when you do something and it works just the way you think it ...
by RET
Tue Dec 31, 2019 12:03 am
Forum: Build Log
Topic: Front End Rebuild
Replies: 18
Views: 1915

Re: Front End Rebuild

Hi Glenn, I didn't even try to measure the smokebox pressure because I didn't think it was going to help me do what I wanted and I was pretty sure it would take an inclined manometer to do the job anyway. In full size I'm sure the smokebox vacuum is higher, but not in the models we work with. As I s...
by RET
Sun Dec 29, 2019 11:08 pm
Forum: Build Log
Topic: Front End Rebuild
Replies: 18
Views: 1915

Re: Front End Rebuild

Hi Glenn, The smoke box vacuum is going to be very low. To measure it, you probably need a vacuum gauge that measures 1" of water at full scale. The other thing you need to remember is that the smokebox vacuum won't be steady, but it will pulse with the exhaust. When I went through this process with...
by RET
Sun Dec 01, 2019 10:49 am
Forum: Live Steam
Topic: Which pressure gauge to use?
Replies: 27
Views: 3234

Re: Which pressure gauge to use?

Hi Glenn, Yes, the axial alignment of stack, blast nozzle and blower nozzle are very important, as well as the vertical positioning of the components. As you found out, misalignment of the components can really affect performance. Using the long paper strip is a simple and effective way to see what ...
by RET
Thu Nov 28, 2019 11:42 pm
Forum: Live Steam
Topic: Which pressure gauge to use?
Replies: 27
Views: 3234

Re: Which pressure gauge to use?

Hi, With the four small rectangular blast nozzles at the top of the blast pipe, there is space for the smokebox gasses from the lower part of the smokebox to come in between the jets and mix with them, then the combined mixture goes through the secondary petticoat at a lower velocity (conservation o...
by RET
Thu Nov 28, 2019 8:45 am
Forum: Live Steam
Topic: Which pressure gauge to use?
Replies: 27
Views: 3234

Re: Which pressure gauge to use?

Hi Glenn, Vacuums inside the smokebox will be quite low and likely would need an inclined manometer to measure. Using one of these while running the locomotive would be interesting, to say the least. I had a similar problem with the Boston & Albany locomotive about 20 years ago, but I went at it a d...