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  • Users: luthster
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  1. luthster

    Best Contact Shape for cup that contacts a single rolling ball

    Hello, I'm forming a cam with a single ball riding in a V-shaped groove in a shaft. The groove runs parallel to the axis of the shaft and then wraps around the circumference causing 90 degrees of rotation. Opposite the groove, the ball is installed in a blind reamed hole in the housing...
  2. luthster

    Growth of 4140 during Heat Treat to Rc 45

    I had some prototype parts machined from annealed 4140 bar through hardened to Rc 42-47 using austempering process. The OD is approximately 3.00 inches and grew about .005" after heat treat. I did not expect this much growth and when I talked to the heat treat source he was surprised by the...
  3. luthster

    Roller chain link plate material & hardness

    I'm designing a product with a simple 2 pin link plate similar to the link plate in a roller chain. What material and hardness is used in roller chain? Is it case hardened or through hardened?

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