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  1. gbritnell

    Helical gear cutting setup

    The home-made gear cutter was secured in the holder and the table (X) was moved to center. The spindle was turned so that the edge of one of the flutes on the cutter was lined up with the point on the gauge. Now the Z was set with a magnifying glass. This is probably the only inaccurate part of...
  2. gbritnell

    Helical gear cutting setup

    Since Chuck Fellows published the drawings for making and using the helical gear fixture I have made quite a few of them. The problem with the whole setup is the indexing/cutting fixture is always at some angle to cut the required gears. At the cutting end of the mandrel is an arbor to hold...
  3. gbritnell

    Holt 75 Crankshaft

    I made the spacers just a light push fit then put super glue around them. When they needed to come out you just give them a tap and they break loose.
  4. gbritnell

    Holt 75 Crankshaft

    Hi ddeal, Here's a link to the complete machining I did for my Holt crankshaft. https://bbs.homeshopmachinist.net/forum/general/26776-holt-engine-crankshaft-machining-step-by-step
  5. gbritnell

    270 Offy

    To use a term taken from my kid's language 'Sweet' gbritnell
  6. gbritnell

    Alignment of cylinders and crank bearings

    Hi Gary, I didn't receive any emails from you, yet. gbritnell
  7. gbritnell

    Hall sensor mount

    The remainder of the pictures. The magnet is pressed into the small angle bracket which mounts to the floor of the distributor. The window is cut into the side of the distributor for the bracket to fit into. The bracket is held to the distributor with 0-80 socket head screws. The timing wheel...
  8. gbritnell

    Hall sensor mount

    Hi Gordon, I have always used a metal bracket to hold my Hall sensors. On any engine that I had trouble with it wasn't because of the holder but rather a poorly fashioned wire joint. Attached are pictures of the distributor from my flathead engine. There's quite a few of them so I'll have to...
  9. gbritnell

    270 Offy

    The collector pipe is the main tube which 'collects' the exhaust gases from all the cylinders pipes.
  10. gbritnell

    Alignment of cylinders and crank bearings

    Rather than trying to 'line bore' main bearing bores on small engines I started making the openings as milled slots. The bearing are then made as a tight fit in the slots. This way the accuracy only needs to be in making the bearing inserts and not trying to line bore a small diameter hole.
  11. gbritnell

    270 Offy

    Terry, Truly remarkable outcome on the header. When I built the header piped for both my inline 4 cylinder and flathead V-8 engine I had the same questions as you for making the openings in the collector pipe. My collector pipe was formed with the first cylinder (bend) I made a mild steel...
  12. gbritnell

    270 Offy

    Hi Terry, When I first built my small tubing bender it would bend SS up to 5/16 but with the roller type shoe in some tubing it would leave an impression at the end of the bend. I changed the roller shoe to a rectangular shape ( rectangular block with the necessary radius cut into it) and that...
  13. gbritnell

    Stephenson's Rocket--Working Model

    Hi Brian, I understand it just a representation of the Rocket locomotive but I think it will really enhance the engine to use hex head bolts rather than the socket head screws. gbritnell
  14. gbritnell

    Marks Holt 75

    Outstanding work on the manifolds Mark!
  15. gbritnell

    Exhaust valve timing

    Here's a visual to better show degrees of movement. Draw a circle. Draw a horizontal and vertical line through the center of the circle. Draw a line 45 degrees from the horizontal line (halfway between what would be the 10:00 and 11:00 o'clock position. Now measure the vertical distance between...
  16. gbritnell

    Marks Holt 75

    Hi Mark When I made the drawings I drew the manifolds whereas a somewhat skilled machinist/builder could make them and still have them look acceptable. What you have done is what I would do but a lot of fellows don't have the ability or patience to carve shaped parts (manifolds) from solid. I...
  17. gbritnell

    Build a mini caterham

    There is nothing critical about the flywheel dimensions. The diameter is the most important. The smaller you make it the higher the idle RPM goes up. You need the flywheel's mass on the O.D. gbritnell
  18. gbritnell

    Build a mini caterham

    To simplify the drive parts why not look into using a centrifugal clutch from something lik a chain saw or weed eater? Making a mechanical clutch and gear box would certainly be very cool but would certainly be more complicated gbritnell
  19. gbritnell

    Marks Holt 75

    Very nicely done on the flywheels! Starting to look quite impressive! gbritnell
  20. gbritnell

    Valve problem

    Before I made a collet holder for my 6" lathe I needed a way to hold small rods concentric so here's what I did. Most 3 jaw chucks will repeat their accuracy or inaccuracy for a given diameter so with that in mind tags a piece of round stock about 1/2 the length of your jaws. Chuck it up and put...
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