Search found 763 matches

by RET
Wed Jan 09, 2019 8:45 am
Forum: Live Steam
Topic: Welding Machine
Replies: 37
Views: 1511

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: 113
Views: 32534

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 ...
by RET
Mon Dec 31, 2018 4:33 pm
Forum: Live Steam
Topic: Union Pacific Big Boy in 3/4 Inch Scale
Replies: 113
Views: 32534

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

Hi, I've just finished with all the passes and it worked just the way I hoped it would. The cutter actually cut into the mandrel a little bit as I expected and since one side of the cutter went a little deeper, that side broke free first. IMGA0961.JPG Originally, I thought the cutter would simply cu...
by RET
Sun Dec 30, 2018 10:48 am
Forum: Live Steam
Topic: Union Pacific Big Boy in 3/4 Inch Scale
Replies: 113
Views: 32534

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

Hi, To explain what Don is talking about, when you make this part, all the CNC process is really doing is going through a similar series of the steps you would have to do if you made it using traditional methods. The big difference is CNC doesn't make mistakes, but it will do EXACTLY what you tell i...
by RET
Sat Dec 29, 2018 2:51 pm
Forum: Live Steam
Topic: Union Pacific Big Boy in 3/4 Inch Scale
Replies: 113
Views: 32534

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

Hi, Power Reverse Crosshead Guide-7.jpg As you can see, its just a case of carrying on until the deep cuts reach the shaft of the right hand mandrel. At that point the "triangular" pieces will fall away and I'll use a combination of regular and riffler files to finish the part. Since I'm making two ...
by RET
Sat Dec 29, 2018 2:34 pm
Forum: Live Steam
Topic: Union Pacific Big Boy in 3/4 Inch Scale
Replies: 113
Views: 32534

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

Hi, A little bit about the mandrel. It is made in two parts, the right hand (long) piece fits inside the 9/16" bore and extends down to the gland packing for the end of the cylinder. The other side bolts through the rod hole and has an anti-rotation pin that withstands the high cutting forces necess...
by RET
Sat Dec 29, 2018 2:15 pm
Forum: Live Steam
Topic: Union Pacific Big Boy in 3/4 Inch Scale
Replies: 113
Views: 32534

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

Hi, Its been a while since I've added to this, but here's the next little installment. This time Its the Power Reverse Crosshead Guide, another major part of the power reverse unit. Here is the drawing I made that I'm using to make the part. Again, this is from the Modeltec 4 aces article which had ...
by RET
Thu Nov 29, 2018 9:53 am
Forum: Live Steam
Topic: What type of Drill Rod for Axles?
Replies: 33
Views: 3247

Re: What type of Drill Rod for Axles?

Hi rkcarguy, Thanks for the explanation. The design you are proposing should work just fine and its simple to do. If you are going to use a standard ball bearing, just make sure you use a sealed bearing that is pressed into the axlebox. You could also use the bolt (or capscrew) to hold the hardened ...
by RET
Tue Nov 27, 2018 11:46 pm
Forum: Live Steam
Topic: What type of Drill Rod for Axles?
Replies: 33
Views: 3247

Re: What type of Drill Rod for Axles?

Hi rkcarguy, I just checked and sorry but you lost a "0." Hey, this is easy to do. I goof up too. For the bolt in question, the ultimate shear strength is close to 100,000 psi. Even mild steel has a yield strength of about 55,000 psi and a shear strength of about 45,000 psi. While your suggestion fo...
by RET
Tue Nov 27, 2018 5:34 pm
Forum: Live Steam
Topic: What type of Drill Rod for Axles?
Replies: 33
Views: 3247

Re: What type of Drill Rod for Axles?

Hi, Pat 1027 wrote "What effect does out of round drill rod have?" OK, I don't consider myself to be a REAL expert, but I'll try to answer your question. If you consider a "plain" bearing (one without any rolling elements, just a shaft in a hole), if the rpm is high enough and the bearing is oil lub...
by RET
Mon Nov 26, 2018 5:28 pm
Forum: Live Steam
Topic: Steam-operated cylinder drains
Replies: 13
Views: 2092

Re: Steam-operated cylinder drains

Hi Kimball, In Fred's design, your answer is "yes," it would be possible, but not in Bill's variation because the "O" ring is on the "piston." However, since the controlling steam would be piped equally to all the cylinders, the locomotive would not move because the pressure would be the same on bot...
by RET
Sun Nov 11, 2018 11:43 pm
Forum: Live Steam
Topic: Bucyrus steam crane
Replies: 12
Views: 1682

Re: Bucyrus steam crane

Hi Hoppercar, Just for clarification, are you talking about the 250 ton capacity Bucyrus Erie "Big Hook?" If you Google "Railroad wrecking cranes," you will find quite a few pictures. It seems that Bucyrus Erie made them for a number of railroads. Like all cranes, full rated capacity is only achieve...