The Craftmans Shop > Model Engineering
Side Valve i.c. engine from Bar stock
Brian Rupnow:
Not much machining accomplished today. I'm a bit overwhelmed by 'real' work right now, plus making a wooden cabinet to hide an ugly wall mounted 100 amp electrical service at my son's house. I did manage to steal 20 minutes out of the day to hone the cylinder/valve chamber with my 3 stone brake hone, and to lap it using a piece of 1" aluminum round bar and first #400, then #600 carborundum paste. Sometime in the next few days, I will use the other end of the 1" aluminum round stock which is not polluted with embedded carborundum paste to make a piston. Good Heavens!!! If I get a piston made, then I am getting awfully close to a finished engine. Oh yeah, I forgot---I still have tappets to make.---Brian
DavidA:
It's coming together nicely.
Makes me feel guilty every time I look at my part finished Jan Ridders engine.
When the weather turns bad again I will have to make some progress on that front. And the Fowler 4F loco.
Dave.
Brian Rupnow:
I haven't had a very "machiney" week due to other obligations. I hope to make a piston sometime today, and I have realized that due to adding the 1/32" gasket between the valve chamber and the cylinder body, I will have to make the piston 1/32" taller between the gudgeon pin and the top surface, in order for it to come even with top of the "deck" when at top dead center.
Brian Rupnow:
Hey Hey!!! we got a piston!!! That's two things accomplished today. Machined a piston and got a haircut. Damn, I'm a good looking fellow when I get a haircut.--Look just like Elvis---sorta---
Brian Rupnow:
I'm very pleased to announce that with rod and piston installed and all gaskets in place, the crankshaft does indeed go "round and round". No matter how much fancy 3D cad modelling I do and how many calculations I make, this is always the moment of truth for me. I actually had one little heart stopper---the crankshaft wouldn't make a full 360 degree rotation when I first assembled everything. I took out the bolts that hold the cylinder to the crankcase one by one, but it wasn't that. Then I pulled the head off----and discovered that the top of the piston actually comes up about .013" higher than the top of the deck. That would have been okay, I have .060" clearance milled into the head.---But--I had cut the gasket hole a bit small, and the piston was hanging up on the gasket material. A bit of very careful exacto knife work to trim the gasket, and that fixed things. A big sigh of relief----Brian
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