Clippard Cylinder for PSC Dummy Brake Cylinder

[mjahn]

I've been told that there's a clippard air cylinder that will readily fit within the Precision Steel Car dummy brake cylinder (see below). Does anyone have any experience with this? I can make a custom cylinder and braze it into the PSC one but it would be a great time saver otherwise.

The cylinder is going on the side of MCRS-4's trailing truck for its brakes and there's two of them, so it doesn't have to be heroic. I imagine it'll only ever see 60-65lbs max.


The cylinder is on the linked page:

http://www.precisionsteelcar.com/details_loco.html

it is part #B-005

[cbrew]

may not be all the useful if the bore is two small

[mjahn]

That may be, but its the army I have so i still need to find a cylinder for it.

[fly5150]

clippard 3ps-1/2

not sure if it is a direct drop-in, but that is the cylinder that I use for brakes, and MDM used inside his castings for working brakes.
-Dave

[cbrew]

clippard 3ps-1/2

not sure if it is a direct drop-in, but that is the cylinder that I use for brakes, and MDM used inside his castings for working brakes.
-Dave

Dave, what psi are you using in those little cylinders and how effective are they?

[mjahn]

Thanks for the lead. I rink that's about double the length I need though. That's been my biggest hurdle so far is getting something short enough to fit but perhaps I could buy a box mount version and mount it to the underside of the truck frame, it just may end up looking like the slack adjusting clevis tucked up under there. I'll try to get the insidem dimensions of the cylinder tomorrow. Was in the shop tonight but my focus was on all the double and custom clevises the truck will need. It's coming along though!

[cbrew]

are the castings of decent enough to bore and use a U -cup seal?
if not maybe machine a bronze liner?
and make you know

[mjahn]

no, we're talking prob .040" wall rough

Scratch that, its probably closer to .060"

[mjahn]

Ok everybody, just measured the castings. Survey says the core where the bore would be is between 1.2"-1.23" and it is 1.3" deep. There's another .125"-.1875" of room in the cylinder head because its hollow. I think that should allow me to use a cylinder that's dia= 1.875" x L= 1.25"-1.375". A .25" piston rod would be perfect if it could be found. Any ideas?

Cbrew, I've been giving some more thoughts to your remarks about they cylinders being weak @ 65lbs because of their size. I'm going to regulate the brakes for engines 1, 2, and the trailing truck separately and they'll be fed from a a high pressure source in the tender (100+lbs, fed by an electric compressor). I imagine I could just regulate a higher pressure for the trailing truck brakes up to source pressure to ake up for their pint size.

Thanks for your insights so far everybody!

[mjahn]

Just found something. Any thoughts?

http://www.mcmaster.com/#standard-air-cylinders/=n4ibcs

[RCW]

Interesting, Mattaniah.

[cbrew]

Ok everybody, just measured the castings. Survey says the core where the bore would be is between 1.2"-1.23" and it is 1.3" deep. There's another .125"-.1875" of room in the cylinder head because its hollow. I think that should allow me to use a cylinder that's dia= 1.875" x L= 1.25"-1.375". A .25" piston rod would be perfect if it could be found. Any ideas?

Cbrew, I've been giving some more thoughts to your remarks about they cylinders being weak @ 65lbs because of their size. I'm going to regulate the brakes for engines 1, 2, and the trailing truck separately and they'll be fed from a a high pressure source in the tender (100+lbs, fed by an electric compressor). I imagine I could just regulate a higher pressure for the trailing truck brakes up to source pressure to ake up for their pint size.

Thanks for your insights so far everybody!

machine a liner, it would be a cake walk