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I think the naming convention is spools in hydraulic valves, piston valves for steam. Also pi$$ed-on valves for the leaky ones I have made before I learned the tricks about PTFE rings on piston valves, and radii at window corners in port openings on sleeves for piston valves.
Looking good Chris! Why did you use the metric (Not that there's anything wrong with that... ) threads on the cylinders & caps? Did the size just work out better? John
Hi Chris, if you wanted to make the sleeve in cast iron, just get a small piece of Meehanite or other continuous cast iron bar. The sleeve will be a walk in the part with that stuff. My suggestion - turn it to be say .188" wall per side outside your finished ID, bore, cut the port windows, turn OD to finish size, lap would be my suggested order of ops. Just food for thought, there are are many materials and methods that will work fine.
By the way, there is no secret handshake, and no dues fee payable, in the black finger club. Members worldwide too. People with itchy ears also get free membership in the black ear-'ole club too.
Quote from: cnr6400 on January 16, 2020, 03:02:00 PMBy the way, there is no secret handshake, and no dues fee payable, in the black finger club. Members worldwide too. People with itchy ears also get free membership in the black ear-'ole club too.
My metal supplier carries round bars of grey cast iron. Beautiful stuff to machine, no voids, no hard spots and no particular grain to it. As CNR says, it's dirty stuff, but a real pleasure to machine. I make all my i.c. cylinders from it.---Brian