Author Topic: Forest 1889 6 cyl Marine Engine  (Read 3512 times)

Offline maury

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Re: Forest 1889 6 cyl Marine Engine
« Reply #45 on: June 05, 2021, 06:53:30 PM »
Guys, thanks for the responses, it looks like i'm mixing a little too much domestic stuff with my shop time.
Crueby, glad I could help.
Kvom, yes. today they probably would use a timing belt. That would be able to operate at a higher speed, and transfer more power to the driven shaft. A vertical side shaft would work also, guess the design could involve the same number of gears as is currently being used.
Dave, I first encountered the "Lee Shaft" in the C.H.Wendel books. It was shown on the Forest & Gallice 5 cylinder engine. I have seen it on pictures of several of Forests early marine engines.

maury
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Offline maury

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Re: Forest 1889 6 cyl Marine Engine
« Reply #46 on: June 10, 2021, 07:50:39 PM »
Ok, getting back in the grove a bit here. The heads are printed now, and so begins the task of making the Lee Shaft, gears,  and a whole raft of small parts. I haven't figured out how to print really small valve springs, so I may make them on the lathe with my spring winder.

These heads would make really nice investment castings, too bad I don't have an iron foundry any more.

maury
"The trouble with socialism is that you eventually run out of other people's money."... Margaret Thatcher

Offline gbritnell

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Re: Forest 1889 6 cyl Marine Engine
« Reply #47 on: June 10, 2021, 08:22:43 PM »
Nice work Maury! It's going to be neat when finished.
gbritnell
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Offline maury

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Re: Forest 1889 6 cyl Marine Engine
« Reply #48 on: June 12, 2021, 01:21:22 PM »
George, thanks for the compliment. I have my hopes up to have a nice model when finished, but I think I'll miss the rumbeling of a real 6 cyl.

maury
"The trouble with socialism is that you eventually run out of other people's money."... Margaret Thatcher

Offline maury

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Re: Forest 1889 6 cyl Marine Engine
« Reply #49 on: June 16, 2021, 09:00:53 PM »
OK, Folks, This part went ok, but there was a bit of tweaking the geometry to get the miter gears to fit nice. The vertical shaft will later hold the governor. Having the timing gears, shafts, and cranks in place, I can work on getting the Lee Shaft built and in place. I will be using steel rods with 3D printed rod ends. The rods are way too thin to get a good print, and even if I was able, the plastic would be just too weak. This is getting into the more tricky part of the engine where some really small parts have to fit and work. We'll see how it goes.
maury
"The trouble with socialism is that you eventually run out of other people's money."... Margaret Thatcher