Engines > From Plans

Greene Automatic Cutoff Steam Engine

<< < (2/102) > >>

crueby:

--- Quote from: Admiral_dk on April 28, 2019, 09:19:01 PM ---I might be mistaken, but look later in the video where you see the bottom two valves controlled by an axel that only oscillates a few degrees back and forth ....  :old:

--- End quote ---


Aha! Thats it, that second eccentric drives  that axle in a small back and forth rotation. Clever!


Thanks!

kvom:
I picked up the castings at NAMES.  Here they are laid out on the shop floor with a 12" rule for comparison (penny might have not been indicative):



A test fit shows that the flywheel can be mounted on my 10EE lathe, but it's unlikely I can use it to turn the rim, given that the crossfeed is limited.  I plan on doing it with an endmill on the CNC mill.

Jasonb:
Look a nice set of castings.

I would have thought you only need about 3/4" cross feed movement at the most to do the rim. Upside down boring bar mounted on the side of the toolpost facing you usually reaches out far enough to do face & side, run in reverse.

http://www.youtube.com/watch?v=bdM-g6Wsc1Y

kvom:
With the Joy engine 10" flywheels I was at the utmost to turn, and these are 11".  I probably need to make a custom tool holder.

kvom:
I have been studying the Solidworks model I got from Dennis Howe.  These are more informative than looking at individual drawings.  I spent the day assigning contrasting colors to the parts in order to see how they fit together more easily.  A zillion parts in this one.  A majority of the nuts are 3-48.

The operation of the exhaust valve is interesting as noted in a previous post.  Driven by an eccentric, the strap is connected to a pivoting part whose motion rocks the long exhaust rod *(second pic).  At the other end an oscillating linkage drives the "grate" valve, shown in the third.  Both halves of the valve have matching through slots that when matched together open the cylinder to the exhaust,  The use of multiple slots allows evacuation of more exhaust for an engine that might run a high speed.

Navigation

[0] Message Index

[#] Next page

[*] Previous page

Go to full version