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Recent content by Brian Rupnow

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  1. Brian Rupnow

    Geared horizontal twin engine

    This morning I loaded my wheelbarrow full of money and went shopping for material. The place I usually shop did not have any 5" x 3/8" brass (for flywheels) nor did the have any 1 1/2" x 1" brass (for cylinders). The 3 pieces you see in the picture cost $60. Then I went to my other metal...
  2. Brian Rupnow

    Self starting single d/a wobbler

    Fcheslop--that is a great idea. I haven't seen that done before. I know that some of the early steam powered Dories liked the motor to be reversible so they could back up, but in most single cylinder engines they let it stop and then started it in reverse.
  3. Brian Rupnow

    Geared horizontal twin engine

    I think I'm going to dive into the Rupnow fortune and buy some brass tomorrow. This engine almost demands that the flywheels be made of brass. Almost all of what remains to be built can be steel or aluminum, but I really like the color contrast of brass. I wish that there was some other cheap...
  4. Brian Rupnow

    Geared horizontal twin engine

    And that, my friends, makes two beautiful cross head guides. I'm very pleased with the way they both turned out. I started this morning at 8:30 and machined until 3:30 to finish the second cross head guide. (That included time to eat my lunch and walk sixteen minutes on the horrible treadmill...
  5. Brian Rupnow

    Geared horizontal twin engine

    No, it was just posed on the end of my desk to get a shot of all the components finished so far. I will post a family shot of all completed pieces by the end of the day.
  6. Brian Rupnow

    Free plans for a larger, simpler, beam engine

    I've given up on the toothpaste as a lapping compound. Now I use 600 grit lapping compound. It is about 10 times faster than toothpaste. You can buy a small jar of it that will last for the rest of your life. I believe it is finely ground aluminum oxide in a base of heavy grease or wax. Do not...
  7. Brian Rupnow

    Geared horizontal twin engine

    Steamchick--That's not a flywheel. That is an 8" v-pulley. I power the v-pulley with a 1/2 horsepower electric motor for a half hour to "run in" the shafts, gears, and bearings, so as to have minimum drag when it is assembled with the engine.---Brian
  8. Brian Rupnow

    Geared horizontal twin engine

    So, as I was saying, these are probably the prettiest cross-head guides I have seen. There is a world of work in machining one of these, and it all has to be done in the correct sequence or you paint yourself into a corner and find that you have nothing to hold onto for the next machining...
  9. Brian Rupnow

    Geared horizontal twin engine

    These do end up making a beautiful cross-head guide, but Oh My Goodness there are a lot of machining sequences to get to the finished product from a piece of round cold rolled steel!!!
  10. Brian Rupnow

    LONGBOY'S "WEDGE RUNNER" Model Gas Engine.

    Very, very nice. Engine sounds good and looks good. Congratulations!!---Brian
  11. Brian Rupnow

    Geared horizontal twin engine

    Tim--I know a little secret about slide valve engines. The slide valve is held tight against the side of the cylinder (where the ports are) by steam (or air) pressure in the steam-chest. However, there is something called gravity that you have to contend with. If the valve slider is on the...
  12. Brian Rupnow

    Geared horizontal twin engine

    Now, if you squint your eyes real hard, you can see the two cross head guides, turned to correct o.d. and cut to length.--I still have a bit of work to do on them tomorrow---
  13. Brian Rupnow

    Geared horizontal twin engine

    The bearing stand and gears are finished, and now I think I'll go after the cross-head guides. I happen to have stock of the correct size left over from some other project, and I'm trying to build this engine "on the cheap" which means using as much stock that I can from stuff just setting...
  14. Brian Rupnow

    Geared horizontal twin engine

    In this picture the gears have been cleaned up, and two test holes have been drilled and reamed in a piece of scrap aluminum at the correct center distance. Two scraps of 3/8" cold rolled rod are inserted thru the gears and into these holes. This way I can check that the gears mesh properly. If...
  15. Brian Rupnow

    Geared horizontal twin engine

    This morning I cut the 36 tooth gears. Yesterday, as you seen, the gear blanks were made from two different pieces of steel. I wanted to cut these gear one time only. The gear in the chuck has an extended hub on one side which is held in the chuck jaws. Both gears have been drilled and tapped...
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