Search found 331 matches

by jscarmozza
Wed Feb 19, 2020 7:29 pm
Forum: Live Steam
Topic: Necessity of hardened crank pins on 3/4” scale
Replies: 49
Views: 6376

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

I'm not all that experienced in this hobby either, but I can say that heat treating in the amateur hobbyist style that most of us use results in scale and a reduction in dimension. Do a test run to see how much of a loss you will get using your heat treating method, then use some Kentucky windage to...
by jscarmozza
Wed Feb 19, 2020 5:09 pm
Forum: Live Steam
Topic: Necessity of hardened crank pins on 3/4” scale
Replies: 49
Views: 6376

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

Enlightening discussion! I made a test pin from hot rolled mild steel and case hardened (kasenit) the rod bushing end and left the end to be pressed into the wheel 'soft', just to see how much the pin diameters changed after heat treating. After buffing the treated pin with emery cloth, both the cas...
by jscarmozza
Wed Feb 05, 2020 9:12 am
Forum: Live Steam
Topic: Calling Marty Knox
Replies: 16
Views: 2684

Re: Calling Marty Knox

50 years is a long service life but the inside of that boiler is a little scary. Geez, the next time I steam up I'm going to feel like Slim Pickens in Dr. Strangelove:)
by jscarmozza
Tue Feb 04, 2020 8:33 am
Forum: Live Steam
Topic: Calling Marty Knox
Replies: 16
Views: 2684

Re: Calling Marty Knox

Yeah, we were pretty sure the boiler was unsalvagable. Not that I'm a boiler maker, but I thought it was odd that there were no stay bolts in the water jacket area. Thanks for the replys. John
by jscarmozza
Sun Feb 02, 2020 2:25 pm
Forum: Live Steam
Topic: Calling Marty Knox
Replies: 16
Views: 2684

Re: Calling Marty Knox

It's a copper boiler Marty, I should have said that in the original post. Yes there are some potential access points. One of the guys at the club has an inspection scope, I think we'd be able to borrow it and fish it in to look around a little, what would we be looking for?
John
by jscarmozza
Sun Feb 02, 2020 10:39 am
Forum: Live Steam
Topic: Calling Marty Knox
Replies: 16
Views: 2684

Calling Marty Knox

Marty, Attached is a photo of my buddy's Tom Thumb boiler, you'll notice the large bulge on the water jacket; our question is, can this section be cut out and patched, or should this boiler be heading for the scrap pile? This engine was probably running at NJLS when you were there, after my buddy bo...
by jscarmozza
Thu Jan 30, 2020 3:27 pm
Forum: Live Steam
Topic: LE Rotary Throttle Build
Replies: 7
Views: 1675

Re: LE Rotary Throttle Build

John, I sent you a PM.
John
by jscarmozza
Thu Jan 30, 2020 10:51 am
Forum: Live Steam
Topic: LE Rotary Throttle Build
Replies: 7
Views: 1675

Re: LE Rotary Throttle Build

Good point by Brent on the port size, I used the same diameter port as the connecting tubing ID and the first half of the quarter valve swing is dead, the port doesn't uncover until the last half of the swing.
by jscarmozza
Thu Jan 30, 2020 8:38 am
Forum: Live Steam
Topic: LE Rotary Throttle Build
Replies: 7
Views: 1675

Re: LE Rotary Throttle Build

Hi Rob, I attached a photo of a spare throttle valve that I have in my parts collection, if this is the correct valve I'd be happy to take it apart and photograph the various components for you. I recently made a replacement smoke box throttle for one of my 1" Atlantics and it works pretty well, but...
by jscarmozza
Sun Jan 26, 2020 1:49 pm
Forum: Casting & Foundry Work
Topic: Making ZA27
Replies: 7
Views: 1824

Re: Making ZA27

I did some research on the matter and found out some interesting facts, when alloys of metals with greatly varying temperatures are made, as Frank said they start with the highest temperature metal and work their way down. The addition of the lower melting temp metals must be done quickly and done u...
by jscarmozza
Thu Jan 23, 2020 6:01 pm
Forum: Casting & Foundry Work
Topic: Making ZA27
Replies: 7
Views: 1824

Re: Making ZA27

Ok, so we should start with the lowest melting temperature metal and 'dissolve' the higher temperature metals in it. I didn't think it worked that way. Thanks guys, I'll keep you posted on how this experiment turns out.
John
by jscarmozza
Thu Jan 23, 2020 8:47 am
Forum: Casting & Foundry Work
Topic: Making ZA27
Replies: 7
Views: 1824

Making ZA27

My casting buddy came by some zinc ingots and suggested that we mix up a batch of ZA27 and see how it pours and how the parts made from it perform. I thought it was a great idea, but then we started thinking about how to melt and mix copper, aluminum and zinc when their melting temperatures vary so ...