Wood Beam Engine fabricated by SAM
- Thread starter SAM in LA
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I had a little time on my hands so I fiddled with the balance weights and valve timing.
I was able to get its speed down to 32 RPM. ;D
[ame]http://www.youtube.com/watch?v=jXsl9gdlNBo[/ame]
I may add some weights to the flywheel and see if I can get it to run any slower. :-\
What do you think?
Any suggestions for further fine tuning?
SAM
This sure is addicting.
I was able to get its speed down to 32 RPM. ;D
[ame]http://www.youtube.com/watch?v=jXsl9gdlNBo[/ame]
I may add some weights to the flywheel and see if I can get it to run any slower. :-\
What do you think?
Any suggestions for further fine tuning?
SAM
This sure is addicting.
mklotz
Well-Known Member
It looks to me like it has more force on the downstroke than on the upstroke. This seems a bit backwards. In the downstroke, the effective area of the piston on which the air pressure works is reduced by the area of the connecting rod so the force exerted (P*A) is less than on the upstroke. If anything, the downstroke should be slightly less forceful than the upstroke.
Perhaps you want to check your valving. Is the valve opening fully for the upstroke? Is there a minute leak in the upstroke valving?
Regardless, it's a lovely engine. I've thought about building it many times but I don't have your woodworking skills. It looks much more authentic running slowly.
Perhaps you want to check your valving. Is the valve opening fully for the upstroke? Is there a minute leak in the upstroke valving?
Regardless, it's a lovely engine. I've thought about building it many times but I don't have your woodworking skills. It looks much more authentic running slowly.
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This is a great looking project. Very well done.
WRT the uneven stroke, it occurs to me that the way the eccentric works the valve beam will displace a slightly different angle as the larger diameter of the eccentric will go higher on the beam than the lower.
WRT the uneven stroke, it occurs to me that the way the eccentric works the valve beam will displace a slightly different angle as the larger diameter of the eccentric will go higher on the beam than the lower.
arnoldb
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Sam, getting a machine running that slowly is an achievement on its own :bow: - you should be extremely proud of that.
As to getting it to run even slower, well, I might just put both feet in my mouth, but it seems that the weight (counterweight?) on the beam could have an influence here if your valve timing is properly set - because of gravity. If you move the weight closer to the pivot point, or make it lighter, it should make for a more "equal" stroke.
Regards, Arnold
As to getting it to run even slower, well, I might just put both feet in my mouth, but it seems that the weight (counterweight?) on the beam could have an influence here if your valve timing is properly set - because of gravity. If you move the weight closer to the pivot point, or make it lighter, it should make for a more "equal" stroke.
Regards, Arnold
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