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Trying brass hex but have seen people turning mild steel off centre.my speed and feed is not known as I manually do it.. Is a high revolution speed with slow feed better

Do you turn hex in a lathe if so how do you do it without wrecking tools.I have seen on this forum machinists turning parts that are off centre .when I try this my cutting tools are broken or a blunt very quickly.Am I trying something that is impossible or is there a trick I don't know about

I recently ask the question about altering the movement of a crank to lower the volume of a stroke and possibly maintain or increases the torque.I would imagine that something similar to this design may work,egg shape on the outer gear maybe.

I am on an I pad so that's why I can't view it.best of luck my valves are rather large but my design calls for them so I can get away with powerful springs and orings

I can't display the PDF but I am building an engine and my valves sealed by orings .my gasses flow in from the side at the bottom and the valve stem is above the seal and guided by a piece of machinable plastic.my valve spring sits on top of the plastic guide much the same way as a normal engine...

Can someone explain why there needs to be a gap in rings .i always believed that they were a tight fit to prevent blowby/oil burning.also any thermal expansion should be equal between cylinder piston and rings otherwise as the motor warmed up compression would leak :hDe:

Thanks for the info I am new to model engineering and have started building an engine of my own design no drawings ,only a lathe and welder.my real interest is in engine effiency and my engine is based on a sterling principle. My machining ability leave a lot to be desired and I am very...

Thanks for your replys I never thought off offsetting the cylinder.Do you think that if you ran a egg shape mounted on the crank that mounted a circular big end with a bearing race would that increase torque or would we lose our gains by increased friction

Does anyone know of a way to distort a cranks circular motion into a oscillating motion.I am thinking that if we decrease the up and down motion and increase the side motion we could increase torque and decrease cylinder volume