Search results

Home Model Engine Machinist Forum

Help Support Home Model Engine Machinist Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
  1. S

    Bob J's No.21 Steam Engine (drawings and STP files by Pat J)

    Thank you all for replying, every day is a school day !
  2. S

    Bob J's No.21 Steam Engine (drawings and STP files by Pat J)

    The engine is coming along fine , thanks for all your help. Being new to steam engines , I was wondering what the relevance was of the shape of the ports.I can replicate the shape of the port on the drawings , but it's a lot of work as apposed to say a parallel slot. I will no doubt copy the...
  3. S

    Bob J's No.21 Steam Engine (drawings and STP files by Pat J)

    Thanks for all your help.I can feel a green twin coming on if my first one works.👍
  4. S

    Bob J's No.21 Steam Engine (drawings and STP files by Pat J)

    Well on my way into this now, I've got to finish the piston off , however, I see there is a counterbore 0.2" deep x .246 dia.(size d drill).surely this must be clearance on. 250" for the connecting rod to go in and protrude through the piston for the nut to go on. Am I on the right track or...
  5. S

    Bob J's No.21 Steam Engine (drawings and STP files by Pat J)

    Thank you , every day I learn something new.👍
  6. S

    Bob J's No.21 Steam Engine (drawings and STP files by Pat J)

    Thanks Richard, I think steamchick has explained it superbly.
  7. S

    Bob J's No.21 Steam Engine (drawings and STP files by Pat J)

    Thanks for the info, just one question, when you say steam oil , do steam engines have an oil mixed to steam ?, or does the steam just pick up oil that is lubricating.
  8. S

    Bob J's No.21 Steam Engine (drawings and STP files by Pat J)

    Hi All, I'm part way through this little engine and would like some advice. I am new to steam engines and on completion,I would like to run it off a small compressor. I see the gland nut on the cylinder has a .257" clearance dia on a .250 con rod . Would I need to put some kind of gasket in...
  9. S

    Bob J's No.21 Steam Engine (drawings and STP files by Pat J)

    Thanks Jason , some good methods there.
  10. S

    Bob J's No.21 Steam Engine (drawings and STP files by Pat J)

    Thanks for that , the rings are the only thing I could see that was not straight forward. I'm going to machine the base out of solid 2 1/2 ×2 1/2, rather than solder the other bearing carrier. Might take a bit of time but that's the only thing I've got which is free !
  11. S

    New member

    👍
  12. S

    Bob J's No.21 Steam Engine (drawings and STP files by Pat J)

    That's what I was after, information about the actual piston ring manufacture. The ring has the width , which is fine, the bottom of the slot dia is .996" . So when turning the rings what size bore and o/d do you work to , do you for instance make them oversize to allow for the slot gap ? Do you...
  13. S

    New member

    Thanks Pat
  14. S

    New member

    Hi all, I've just joined this group and would like to introduce my self. Brief working history, Time served toolmaker , worked in a sub contract shop for 17yrs , machining cutting tools for the oil industry, press tools , jigs and fixtures before finishing my career at the biggest aero...
  15. S

    Bob J's No.21 Steam Engine (drawings and STP files by Pat J)

    I like this engine, I have however, a question.The piston ring has a width but no other dimensions, unless I've overlooked it.what have other people done about this part.?
Back
Top