The Craftmans Shop > Model Engineering
Side Valve i.c. engine from Bar stock
Brian Rupnow:
This afternoon I cut the 15 tooth crankshaft gear from 3/4" diameter cold rolled steel. The mill liked that!! No quivering and shuddering like when I cut the stress proof 1144. I found a left over piece of grey cast iron and bored it 3/8" through, then press fitted and Loctited a cold rolled steel arbor tuned to 0.376" diameter into it. It can set in the lathe until tomorrow sometime when I find the time to turn it down to 0.708" diameter, and then I will cut teeth into it on the mill. The crankshaft gear is steel, and will be pinned to the crankshaft with a 0.093" diameter hardened steel pin. The cast iron jockey gear will ride on a 3/8" diameter shoulder bolt.
Brian Rupnow:
Here is a post from yesterday morning, when I was in Hamilton, Ontario. I couldn't get on the forum from there, as I couldn't remember my password---
So---No machining lately. I started a new contract for an old customer this week, and it's one of those deals where I have to be "On site" to do it. It's kind of fun to go back to work for a while, but it doesn't leave me much energy at the end of the day for machining in my own home shop. My life has been exciting lately, and not in a particularly good way. After setting in the old computer chair at my customers for two days, my back has "gone out" and so I'm living in 4 hour stretches, from pain pill to pain pill. I have had an allergic reaction to a steroid nasal spray, and have tonsilitis as a result. Life sucks when ya get old!!! I m setting on a computer in the Comfort Inn in Hamilton this morning, waiting to walk my daughter down the aisle at one o'clock today at her wedding. Then a reception tonight, where I will have to be cheerful and happy and dance with my dear wife, while secretly hurting like heck and grumpier than a bear with a sore a$$ !!! Ah well, enough whining for now. I am getting really excited about this new engine, and even though the project is slated as "A new engine for fall", fall is fast approaching. I ordered all of the bearings last week, and also purchased all of the aluminum bar stock I will use, along with the cold rolled steel flatbar for the crankshaft webs. I took my gigantic lump of bronze over to the place I buy my aluminum and they are going to saw of a couple of slices for me, one to make a flywheel from and a thinner one to cut "odds and sods" from for accent pieces on the rest of the engine. My 3D cad models are 99% finished, and also most of the mechanical detail drawings. I see someone else standing around the lobby watching me, so they probably want to use this computer. So---wish me luck guys. I will post more when this grand event is over and life returns to normal.----Brian
Brian Rupnow:
Back home today. Wedding went off without a hitch. The bride was beautiful and I have gained a handsome young son in law. I am looking forward to sleeping in my own bed tonight. The older I get, the less I sleep in Hotel rooms. I am going to get back to the engine this week and get the jockey gear cut. Once all of the gears are finished I will decide what to make next.---Brian
awemawson:
Brian,
I empathise greatly with your back 'going out' when away. I well remember once incident when I was doing some consultancy work in Poland. I woke up in the morning with what turned out to be a slipped disk. I couldn't move - couldn't get my socks on - and I had to catch the only flight out of Wroclaw that day :bugeye:
Ended up rolling all over the floor making all sorts of contortions rather than ask a maid to put my socks on in a language I only knew a couple of words of :lol:
Brian Rupnow:
Awemawson--When rolling around on the floor in a foreign country, you have to be VERY careful of what you ask the maid to do!!!---It might be something other than what you expected---Thankfully my back isn't feeling quite as "ouchy" today. I have taken my $500 ergonomic chair and my heating pad strapped to the back over to my customers office. This isn't quite as weird as it sounds, since it's a very small company and I am the only design engineer there. I may look a bit foolish, bet there aren't many people to see it, and I would gladly suffer looking foolish if it makes my back stop hurting.---Brian
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