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turning between offset centres

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Ratchap:
morning all  I have come accross an article on making a 2 cylinder steam engine with  a rotary valve that uses  no castings.I have no idea where it came from  its just called RoataryValveEngine.PDF. I plan on having a go at it
but to make the crankshaft it says the cranks is made  from 1 " dia 4 inch long cold rolled steel that is mounted in one pair of off set centres could some one please point me to  how this is done

happy new year all Nigel

Florian Eberhard:
Hey Nigel

The "offset centres" refers to the center holes which are drilled off center. (but the same amount on each end of the bar). So if you take these center holes between centres on your lathe, you can machine the crankpin since those offset center holes are drillet to be the center of the crankpin.

Now there are different approaches on how to machine a crankshaft from barstock and as one piece - but I guess this can be found in the forum. (for example have a look at a building thread of Geroge (gbritnell)

Florian

fumopuc:
Hi Nigel,
may be this will help you to imagine the process.
http://www.modelenginemaker.com/index.php/topic,7395.msg173109.html#msg173109

Ratchap:
many thanks guys  it now makes  sense  i need a lathe dog and drive plate
I knew some one would come through  with the way to  do it

Nigel

chucketn:
Nigel,
Is this the plan?

http://www.john-tom.com/MyPlans/Steam%20Engines/RotaryValveEngine.pdf

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