Search found 159 matches

by daves1459
Thu Apr 23, 2020 6:32 pm
Forum: Live Steam
Topic: Air Pump D Valves
Replies: 29
Views: 3245

Re: Air Pump D Valves

I found this item on ebay. PEEK 1.0 in. diameter, 3.0 in. long. I bought one of those pieces. At $25.00 it is affordable enough that if the PEEK material doesn't work the loss is not too great. To Bill Shields point the cross sectional drawing on the pump in the current issue of LSORR shows some so...
by daves1459
Tue Apr 21, 2020 7:35 pm
Forum: Live Steam
Topic: Air Pump D Valves
Replies: 29
Views: 3245

Re: Air Pump D Valves

2000 psi, being shoved back and forth by a narrow shoulder will quickly end up with a dimple and lose valve travel. by all means try it...but don't be surprised if you lose functionality.. I get your point. Especially designs like I'm considering where over travel between the piston and valve call ...
by daves1459
Mon Apr 20, 2020 7:30 pm
Forum: Live Steam
Topic: Air Pump D Valves
Replies: 29
Views: 3245

Re: Air Pump D Valves

I was unaware of the Torlon 4301 and will look into it. Thanks for the tip. Same for the PEEK material. I'll look into that also. Being that it is carbon fiber impregnated I thought it not an issue. I've heard that those using virgin Teflon have to use a frame. As I recall the spec. sheet gave the P...
by daves1459
Sun Apr 19, 2020 7:35 pm
Forum: Live Steam
Topic: Air Pump D Valves
Replies: 29
Views: 3245

Re: Air Pump D Valves

Which is why 100's of these pumps have been successfully built and operated using 303 stainless valves The first two pumps that I built had 303 stainless steel valves and they worked well. That is as long as lubrication was present in adequate amounts. Almost as soon as the lubricant was missing sc...
by daves1459
Sat Apr 18, 2020 11:42 pm
Forum: Live Steam
Topic: Air Pump D Valves
Replies: 29
Views: 3245

Re: Air Pump D Valves

Dick_Morris wrote:
Sat Apr 18, 2020 10:07 pm
PEEK HPV
Yikes! 1 inch diameter by 1 foot $141.05. Good to 480 degree f.
Yeah, but for the little valves for a feed pump wouldn't a 5/8" diameter at $42.11 a foot or 3/4" diameter at $56.84 a foot do?

Dave
by daves1459
Sat Apr 18, 2020 7:48 pm
Forum: Live Steam
Topic: Air Pump D Valves
Replies: 29
Views: 3245

Re: Air Pump D Valves

I've run up against several aluminum bronze alloys over the years. They ranged from incredibly difficult to machine to moderate. I've had good luck on small to medium model parts with alloys with 13% or less aluminum using high speed steel tools as long as they are dead sharp. Micro grained carbide ...
by daves1459
Fri Feb 28, 2020 8:14 pm
Forum: Live Steam
Topic: BR55/G8.1 Locomotive Project
Replies: 44
Views: 8045

Re: BR55/G8.1 Locomotive Project

Hi, Does anyone chamfer the edges of the firebox plates? Firebox Chamfer 1.png Thanks Ian I do on boilers with flanged end plated, but not in the mud ring area. I chamfer the plate flange edges from the top of the mud ring up to the crown sheet. The purpose is to keep the water leg flow area as ope...
by daves1459
Wed Feb 26, 2020 9:18 pm
Forum: Live Steam
Topic: Most cost efficient way to get steel tire blanks?
Replies: 38
Views: 5939

Re: Most cost efficient way to get steel tire blanks?

The following may offer some reference for those wishing to try trepanning the center out of a steel plate. What is shown in the pictures is a A36 plate 1" thick 12" square. The corners of the plate were cut off so the plate would swing over the lathe bed and held in a 10" 4-jaw chuck. What I'm maki...
by daves1459
Thu Feb 20, 2020 10:03 pm
Forum: Live Steam
Topic: Necessity of hardened crank pins on 3/4” scale
Replies: 49
Views: 9630

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

I have never worked with pre-hardened 4140 so can not comment. Although I have found annealed 4140 not the most pleasant metal to machine. Annealed 41L40 is readily available and with the lead in it machines very well. It heat treats about the same a standard 4140. LaSalle has another version of it'...
by daves1459
Wed Feb 19, 2020 11:18 pm
Forum: Live Steam
Topic: Necessity of hardened crank pins on 3/4” scale
Replies: 49
Views: 9630

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

If I may, 12L14 is un-heat treatable. It is screw machine stock. The miniature nuts and bolts we buy are made from 12L14. The "L" in the designation stands for lead which acts as a chip lubricant during machining. Lead melts around 550 degree F and vaporizes around 1,100 degrees F. With red hot temp...
by daves1459
Thu Jan 16, 2020 8:49 pm
Forum: Live Steam
Topic: Silver Soldering Leaf Springs
Replies: 14
Views: 2637

Re: Silver Soldering Leaf Springs

The silver solder you want is "Easyflo-45". It is available at all welding shops and you can probably find a troy ounce on Ebay. Easyflo-45 has the lowest melting temperature of all of the readily available silver solders at 1130 degrees F plus high fluidity and joint penetration. It has cadmium in ...
by daves1459
Thu Jan 16, 2020 8:14 pm
Forum: Live Steam
Topic: New york style pump
Replies: 11
Views: 2381

Re: New york style pump

I believe I have the drawings your looking for. PM me if you want to arrange for a set of copies.

Dave