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  • Jasonb
    Jasonb replied to the thread Mystery steam engine.
    Yes black it again and put the rod in from the bottom
  • Jasonb
    Jasonb replied to the thread Mystery steam engine.
    Check with Charles first but I would say you are OK to add whatever the distance the line is back from the edge measured in the middle...
    • shift hole.JPG
  • Jasonb
    It's a job for a small boring bar, you are probably getting chatter on the large 11/16 cutter which is causing it to cut oversize and...
  • Jasonb
    Jasonb replied to the thread Mystery steam engine.
    I'm with Charles
  • Jasonb
    As I said earlier the conical shape of the crown will take most of the heat and has a similar effect to reducing the OD above the rings...
    • gnomes head.JPG
  • Jasonb
    Or just get a smaller OD ball bearing, you can get 3/8" ID x 5/8" OD and put it on whatever shaft you like. Added bonus is they are...
  • Jasonb
    It is usual to hone the cylinder to remove cutter marks and refine the surface for the rings to run against so as you have to do that...
  • Jasonb
    Jasonb replied to the thread Mystery steam engine.
    As this engine seems to have blind bores it would be difficult to shape the bottom of the cylinder cavity like you would a separte end...
  • Jasonb
    Jasonb replied to the thread Mystery steam engine.
    As there doe snot seem to be anything to stop the pins moving sideways it is possible the screws were for a cap, much like a decorative...
  • Jasonb
    With 1thou clearance the piston should slide freely within the cylinder, you will feel resistance when the rings are fitted particularly...
  • Jasonb
    Jasonb replied to the thread Mystery steam engine.
    Well it is unlikely to be an oil point a sthere is a hole for that at the top of the rod. Possibly just to close the hole and then take...
  • Jasonb
    Yep
  • Jasonb
    Jasonb replied to the thread Mystery steam engine.
    You would need to be very careful doing any bending or milling. With the forked ends to the eccentric rods just bending one end or...
  • Jasonb
    Jasonb replied to the thread Mystery steam engine.
    It is not unusual to harden expansion links, as they take a lot more work to make than a die block you harden the link so that should...
    • 20250131_102312.jpg
  • Jasonb
    Jasonb replied to the thread Mystery steam engine.
    What is the diameter of the narrow part of the pin? I would be tempted to mill off the head and reduced diameter, drill and tap what...
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