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  1. Sprocket

    25 HP Nash

    John, On the first version I made of this crankshaft, I did round the ends on the lathe. I thought it might look better more rounded, and as long as I was doing it again... first time second time It just seemed it needed to be a smaller radius than I got turning it on the lathe. Purely visual...
  2. Sprocket

    25 HP Nash

    George, I really like silver brazing. My first real silver brazing project was a mountain bike frame that I rode for several years, Fillet brazed, no lugs. It has gotten more expensive since then, but I still like working with it. Doug
  3. Sprocket

    25 HP Nash

    To continue, The crankshaft cleaned up nicely with soapy water and a wire brush. Had to make sure I cut out the right parts, then rounded the inner ends of the throws, and milled out the center of the throw. To maintain the distance in the throws, I'd made some little "T" nut pairs to...
  4. Sprocket

    25 HP Nash

    Crankshaft. This part was difficult. It would seem that the way it's made would keep it straight because everything is symmetrical. It didn't work out that way. The first one was just as the plans. It was hard to keep parts positioned for brazing, and ended up with too much bend when it was...
  5. Sprocket

    T head engine by Brian

    Saw something about a tornado in Barrie, Ontario. Was it anywhere near you?
  6. Sprocket

    25 HP Nash

    So, I got back to the point of boring the crankshaft bearing holes. I'd been thinking about it way too much, got to go ahead and start. The holes are about 1- 3/16" in diameter and go through the ends and the middle plate. I suppose if I had a very long boring bar, I could do it all from one...
  7. Sprocket

    25 HP Nash

    Back again. Before I could bore the crank shaft bearing holes, I had to join top and bottom pieces and even off the surfaces. just a bunch of drilling and tapping to get to this. There is a symbol for surface finishing on the ends that looks like a square root symbol with a second line...
  8. Sprocket

    Farm Boy running

    Canyonman, Look here:Farm Boy Hit-&-Miss 4-Cycle Engine Plans
  9. Sprocket

    25 HP Nash

    Another little detour. I decided that rather than make the coolant manifolds from soldered brass pieces, I'd make them from miniature plumbing parts. I got "T's" 90's and 45's from PM Research in 1/4", and tubing to match. the castings come either un-machined on trees, or for a lot more money...
  10. Sprocket

    A new attempt at making piston rings

    As I read the Trimble articles, and he talked about all the rings he made and tested in the V8, I had to wonder if he ever finished that engine.... I never saw anything about it running, other than external power, but maybe I missed that. Doug
  11. Sprocket

    25 HP Nash

    Jim, Thanks for the heads up. I hope it won't be necessary as these cylinders are pressed, (he says shrunk) into the water jackets. I may see if I can wick some Loctite in from the ends as a backup. Haven't ever used the green, but this seems like a good place to try it. Thanks, Doug
  12. Sprocket

    25 HP Nash

    Chuck and Paul, thanks for your comments, I have been using oxy-acetylene for brazing. In the past, I have tried propane and have had little success except for very small parts. It may be that propane will work, but I'm not sure I have the patience to wait that long. I also like being able to...
  13. Sprocket

    25 HP Nash

    The next step was to mill the mating surfaces. The bolt rails stick up a bit from the ends and center, and are milled down so all the parts are flush. I also milled some from the outside to blend the brazes in and take off the overflow. The end mill has a little chamfer on...
  14. Sprocket

    25 HP Nash

    I finally got to brazing the crankcase. There are eight pieces in the bottom of the crankcase, and eight in the top. I needed to make a little fixture to hold the valve bodies aligned with the base of the water jacket, but it also worked to hold crankcase pieces together. The four sides and...
  15. Sprocket

    25 HP Nash

    Got the videos of end rounding loaded End rounding on the rotary table - YouTube finishing the ends - YouTube Chuck and George, thanks for your comments. Chuck - Set ups are funny, everyone sees a process differently, so there are many ways. I guess all that really matters is that you...
  16. Sprocket

    25 HP Nash

    Back again. Next parts were the rocker arms. Not typical rocker arms, the cam rides on a wheel in the center of the arm, pivot at one end and lifter at the other. They are tapered top and bottom, and narrow in the mid section with "dog bone" ends . They were spec'd to be 7075, but I didn't have...
  17. Sprocket

    Ford 300 Inline Six

    I'm sure I missed it somewhere, but what are you using for blast media? Thanks, Doug
  18. Sprocket

    25 HP Nash

    I skip around a little when I make parts. Sometimes it's how much time I have or a set up I can use again. Somehow I had a setup that would bore the about 1 9/16" diameter of the water jackets, so I made the mount pads for the water inlets and the hand grip. They will be soft soldered on to the...
  19. Sprocket

    25 HP Nash

    Part of what I found attractive about this engine is the heads. There are 14 bolt bosses on each head, around a curved and radiused surface. So 14 hex heads sticking up on top of each head. I think it just looks cool. But there are 28 little bosses to make. I decided to leave the edges square as...
  20. Sprocket

    25 HP Nash

    I started to make the water jackets. Kind of an interesting problem to bore the undercut inside the water jacket. The inside contour sort of follows the outside contour, but you can't see what you are doing. there is a mount piece that attaches to the bottom of the water jacket for bolting to...
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