Search found 729 matches

by RET
Sat Aug 18, 2018 11:00 pm
Forum: Live Steam
Topic: Choice of prototype
Replies: 35
Views: 971

Re: Choice of prototype

Hi Evgen, You say that the locomotive(s) will be built by your family and friends. If so, two very important considerations are what equipment do you have available to use and what hands on practical machining experience do each of you have? To a great degree, this will determine what is possible in...
by RET
Sat Aug 18, 2018 8:56 am
Forum: Live Steam
Topic: Choice of prototype
Replies: 35
Views: 971

Re: Choice of prototype

Hi Evgen, First, asking your questions this way is better, because you get responses from everyone, not just me. As I said to you before, my preference would be an American articulated because especially in a large size, such a locomotive would be VERY impressive. My own preference would be for a Bi...
by RET
Thu Aug 16, 2018 9:06 am
Forum: General Discussion
Topic: Machining Setup's with Few Comments
Replies: 62
Views: 10706

Re: Machining Setup's with Few Comments

Hi Don, Essentially, what you are doing is using a follower rest to support the work. About 30 years ago, I needed to do the same thing when I was working on the German 88mm. gun model. I needed to turn down a 3/16" dia. shaft to 0.10 dia. so I could thread it for #4-40 NC. I had a proper follower r...
by RET
Tue Aug 14, 2018 4:25 pm
Forum: Live Steam
Topic: steam lines to cylinders
Replies: 6
Views: 581

Re: steam lines to cylinders

Hi, Another factor in all of this is how much back pressure you have in the blast nozzle. If there is a lot, the engine will sound more like the real thing, but you will tend to suck more ash & cinders into the tubes at a fairly high velocity. With the Boston & Albany, I have arranged things in the ...
by RET
Sun Aug 12, 2018 7:03 pm
Forum: Live Steam
Topic: steam lines to cylinders
Replies: 6
Views: 581

Re: steam lines to cylinders

Hi, When I did the Boston & Albany smokebox, I spent quite a bit of time trying to get the best steam pipe alignment I could so I would be able to use 303 gun cleaning brushes on the flues and tubes. The Boston & Albany is 3 1/2" gauge. Now if you are able to access the tubes and flues easily, it fo...
by RET
Sun Aug 05, 2018 10:49 am
Forum: General Discussion
Topic: Crowned pulleys
Replies: 26
Views: 2327

Re: Crowned pulleys

Hi Mr. Ron, Yes it definitely would apply to sanding belts. Remember in my post where I said the crown "steers" the belt to the center of the pulley. With larger installations you can see this happening if you watch how the belt approaches and comes onto the crowned pulley. When the belt is off cent...
by RET
Sun Aug 05, 2018 12:11 am
Forum: General Discussion
Topic: Crowned pulleys
Replies: 26
Views: 2327

Re: Crowned pulleys

Hi,

Adding to the above post, if there are multiple pulleys, only one or at the most two of them need to be crowned, but there should be at least 135 degrees or preferably 180 degrees of "wrap" on those pulleys for good control.

Richard Trounce.
by RET
Sat Aug 04, 2018 11:36 pm
Forum: General Discussion
Topic: Crowned pulleys
Replies: 26
Views: 2327

Re: Crowned pulleys

Hi, For flat belt drives, if it is a two pulley setup, one pulley should be flat and the other crowned. Both pulleys can be crowned, but it usually works better with just one. The amount of crown depends on the width of the belt. If it is a two foot wide conveyor belt, the crown should be about 1/4"...
by RET
Sat Aug 04, 2018 1:08 pm
Forum: Home Shop CNC
Topic: Backlash on a CNC mill
Replies: 5
Views: 570

Re: Backlash on a CNC mill

Hi, To be really useful and capable of making accurate parts, you need zero (absolutely none!) backlash on all 3 axes of a CNC mill (and if you happen to have more than 3 axes, you need to have the extra axes treated the same way). The machine also needs to be heavier than you would think necessary ...
by RET
Wed Jul 25, 2018 11:48 pm
Forum: Live Steam
Topic: Milk of Magnesia as Anti-Sieze?
Replies: 41
Views: 3247

Re: Milk of Magnesia as Anti-Sieze?

Hi, Before the days of ball and roller bearing dead centers, it was normal practice to use white lead mixed with a little oil to lubricate the tailstock center. Using it so that you could remove screws years down the road would also make perfect sense in the days before Neverseez and other such comp...
by RET
Mon Jul 23, 2018 7:51 pm
Forum: Live Steam
Topic: Could I get an idea on what different sized mills can hog?
Replies: 13
Views: 902

Re: Could I get an idea on what different sized mills can hog?

Hi shld, As Fender says, try a roughing end mill. You'll be surprised how well it works. Some time ago, I bought a 1" dia. roughing mill and I was amazed by the cuts I could take without loading down the machine. In addition, the cutter even gave a half way decent finish. I don't use it very often, ...
by RET
Wed Jul 11, 2018 8:31 am
Forum: Live Steam
Topic: Rapid Steam Pressure Loss
Replies: 24
Views: 1942

Re: Rapid Steam Pressure Loss

Hi, From what you say, it sounds as though you are getting way too much draft when running. "Stack talk" may sound nice, but even in a coal burner it wastes power. Opening up the blast nozzle until the ""stack talk" almost disappears is the way to go. I haven't run propane myself (just coal), but ev...