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Twin Cylinder Steam Engine
bogstandard:
Darren,
The reason people have trouble with eccentrics is they think the sky will fall on their head if they don't use a four jaw independant to make them.
The way I showed is the easiest way I think they could be made, and your comment proves it. Once you have set up the first one, you can make a hundred all the same, without having to set up the four jaw every time.
Doing everything the way the 'flat earth society' (old phart machinists) does it, can lead to all sorts of problems, a bit of lateral thinking cures all that.
If it turns out right, there is absolutely nothing wrong with the method.
John
Brass_Machine:
--- Quote from: bogstandard on May 01, 2009, 04:10:39 PM ---...
If it turns out right, there is absolutely nothing wrong with the method.
...
--- End quote ---
OT
Woohoo! Had the same thing in a different sense. Common practice in performance engines is to port (making bigger and polishing) the intake and exhaust ports of the head. Now depending on the make of the engine, the ports may already be to BIG. We found (with dyno testing) we would get more HP by decreasing the intake port size and dimpling the walls (think golf ball) than with a traditional port job!In fact, several motorcycle manufacturers have now been decreasing stock ports!
/OT
Truer words were never said John!
Eric
Darren:
Don't get me wrong John, If I hadn't read your instructions I'd probably have used the four jaw as well, and struggled.
Nope, your ideas show that a real newbie could do it....opps...I just did..... :lol:
Divided he ad:
Got to Say Darren that lathe of yours really does do a good job of the Stainless :bugeye:
This method of eccentric making will be logged and certainly referenced for future use.... It really does look damn easy!!! :ddb:
Oh Darren..... Not too "allert" then ehh!! :lol:
I have the strangest feeling that your going to be really proud of this little engine when it's finished :beer:
Glad your keeping us up to date on it's progress :thumbup:
Ralph.
Darren:
--- Quote from: Divided he ad on May 02, 2009, 06:33:51 AM ---Got to Say Darren that lathe of yours really does do a good job of the Stainless :bugeye:
--- End quote ---
Yes, I've manage to get turning SS down to a fine art, either 303 or 316. Those grooves are a 4mm plunge cut at full width and they turned out rather good.
I found the trick with HSS tooling and stainless is low rpm and low feeds, about 3-400 rpm. With tungsten tips the opposite is true and here I use 2-3000 rpm with a high feed rate, slower and the finish is not so good.
I think that's why peeps have difficulty with tips and SS, not enough speed. Of course others may have different ideas, though the above seems to work for me.
Drilling, milling and tapping is another ball game, but at last I'm beginning to get a feel for those too. A little way to go yet but it's comming.
Practice, practice, practice :)
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