Search found 773 matches

by RET
Mon Feb 11, 2019 10:48 am
Forum: Live Steam
Topic: Power Reverser questions
Replies: 19
Views: 1138

Re: Power Reverser questions

Hi Bill, If you check the thread "Union Pacific Big Boy in 3/4" scale," you will see that the control valve body is already made. I still have to make the valve cover and valve plate. The valve body except for the mounting flanges is roughly a 3/8" cube which is held onto the top of the reverser cyl...
by RET
Sun Feb 10, 2019 11:03 pm
Forum: Live Steam
Topic: Power Reverser questions
Replies: 19
Views: 1138

Re: Power Reverser questions

Hi, I checked my copy of the Locomotive Cyclopedia (1941 version) and it says that the Alco units were air powered. These units were a simple servo mechanism. When the unit is at rest with the supply pressure on, if you look at the linkage, you can see that motion of the control lever will cause the...
by RET
Sun Feb 10, 2019 2:02 pm
Forum: Live Steam
Topic: Power Reverser questions
Replies: 19
Views: 1138

Re: Power Reverser questions

Hi, Two things to think about. First, in the Big Boy video I have, it takes about 5 seconds for the reverse unit to go from full forward to full reverse. Slow and deliberate, not fast. Second, if you run a model locomotive while holding onto the unlatched Johnson bar with your hand, you can feel fai...
by RET
Sun Feb 03, 2019 9:25 am
Forum: Live Steam
Topic: silver soldering steel to steel
Replies: 33
Views: 2032

Re: silver soldering steel to steel

Hi, What Builder01 is showing is the right stuff. Insulating brick is white, it is very light (because it is mostly air) and has no mechanical strength to speak of. Anything between G20 to G23 are the designations you want. If I remember right, the higher numbers are more fragile but insulate better...
by RET
Sat Feb 02, 2019 10:32 am
Forum: Live Steam
Topic: silver soldering steel to steel
Replies: 33
Views: 2032

Re: silver soldering steel to steel

Hi John, The obvious question is; why not take a couple of pieces of the steel you are going to use and try to silver solder them together? This should give you all the answers you need before you put any significant work in what you want to make. From what Don & the others are saying it should work...
by RET
Wed Jan 30, 2019 8:09 am
Forum: Live Steam
Topic: silver soldering steel to steel
Replies: 33
Views: 2032

Re: silver soldering steel to steel

Hi, One thing I forgot to mention is that I do all my silver soldering on an insulating brick "hearth." This makes a big difference, since you don't have to worry about the heat getting away from the underside of the part. Don't use firebrick, it isn't a good enough insulator; what you need is the w...
by RET
Tue Jan 29, 2019 9:38 am
Forum: Live Steam
Topic: silver soldering steel to steel
Replies: 33
Views: 2032

Re: silver soldering steel to steel

Hi John, Everything that's been said so far is good but there is a little more to it. First, with big parts especially, you can overheat and burn the white flux. When you do, it turns black and doesn't work any more, but I have never been able to do the same thing with the black stuff. Second, Use l...
by RET
Sat Jan 26, 2019 12:23 pm
Forum: Live Steam
Topic: Union Pacific Big Boy in 3/4 Inch Scale
Replies: 114
Views: 35229

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

Hi, I have used riffler and ordinary files to finish one side of the crosshead guide and the machining grooves disappear quite easily but in this last while, I have been working on the top feed assembly. What you see isn't quite finished, but the finishing touches are relatively minor. The 4 bolt ho...
by RET
Fri Jan 25, 2019 7:22 pm
Forum: Live Steam
Topic: Choosing the right drawing
Replies: 4
Views: 637

Re: Choosing the right drawing

Hi Evgen, I can't say I'm right, but in many of the drawings you are showing, the drawing was originally done in the 1920's but was revised in the 1950's. After seeing the drawings you are referencing, I would guess that the revision was necessary to cover a redesign of the supplied part that was do...
by RET
Fri Jan 25, 2019 6:55 pm
Forum: Live Steam
Topic: How Can I Determine Threads
Replies: 8
Views: 690

Re: How Can I Determine Threads

Hi, Sometimes it helps if you know who built the model or even where it was built. If it was built in England, there is a very good chance it would have BA (British Association) threads which are quite different from what we are used to in North America (BA #0 is the biggest, a little less than 1/4"...
by RET
Wed Jan 09, 2019 8:45 am
Forum: Live Steam
Topic: Welding Machine
Replies: 37
Views: 2761

Re: Welding Machine

Hi, I'm not sure what the connection is between a welder and Hi Fi equipment, but that doesn't really matter. McIntosh has always had a good reputation (I'm talking about years ago). Two things that do matter in the Hi Fi world. First, the argument for heavy speaker cabling does have a "SLIGHT" foun...
by RET
Mon Dec 31, 2018 4:51 pm
Forum: Live Steam
Topic: Union Pacific Big Boy in 3/4 Inch Scale
Replies: 114
Views: 35229

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

Hi, Part way through this process I overloaded the Sherline spindle motor and it burned out. I'd previously bought a two HP permanent magnet DC motor from Princess Auto (cheap) and I decided to use this as the replacement for the Sherline fractional horsepower one. It took a while to install it and ...