John MacArthur's latest activity

  • J
    John MacArthur replied to the thread Query pendulum amplitude.
    Upon looking at various definitions, I see that many show the amplitude as being only half the swing. This may be related to electronic...
  • J
    John MacArthur replied to the thread Query pendulum amplitude.
    Amplitude of the pendulum is the total swing angle from end to end, not from center. If this is a weight driven clock, it will likely...
  • J
    John MacArthur replied to the thread Dividing Head for Mill.
    I love my CNC. It's a better hacksaw. The finish work, except in the case of gear teeth, is still all done by hand. Johnny
  • J
    John MacArthur replied to the thread Dividing Head for Mill.
    The Sherline rotary table indexer (CNC Rotary Table Indexer – Sherline Products) can be used on any manual mill. You index it with the...
  • J
    John MacArthur replied to the thread Antique regulator clock.
    Maybe show us a pic of the pendulum suspension and top block as well. In your pics there appears to be a cross-wise mark on the end -...
  • J
    John MacArthur replied to the thread Carriage clock.
    It's not a carriage clock and the whole strike control mechanism is missing. Johnny

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