Hi Folks,
This thread is about another thread. Specifically, the thread on the spindle nose (chuck or faceplate mounting) of a friend's 9" Model ARM. It is slightly deformed.
The 4-jaw chuck mounts satisfactorily but neither of the two 3-jaws supplied with it (used school machine) will snug up to the end of the thread. They bind about 2/3 of the way along. The thread is visibly rounded over for the first couple of pitches.
Machine has the usual twin lever gearbox and the lead screw is true to label at 3mm pitch.
The solution seems to be to fit a screwcutting tool to the toolpost and hand feed a threading operation to trim the sides of the thread.
Problem is: We cannot locate information about:
1. Details of the threadform of the spindle nose thread. Is it 3mm pitch or possibly 1/8th inch or ?
2. What number of teeth were supplied for the stud gear and screw gears? This lathe has been used in a school and gears supplied may have been transposed.
This thread is about another thread. Specifically, the thread on the spindle nose (chuck or faceplate mounting) of a friend's 9" Model ARM. It is slightly deformed.
The 4-jaw chuck mounts satisfactorily but neither of the two 3-jaws supplied with it (used school machine) will snug up to the end of the thread. They bind about 2/3 of the way along. The thread is visibly rounded over for the first couple of pitches.
Machine has the usual twin lever gearbox and the lead screw is true to label at 3mm pitch.
The solution seems to be to fit a screwcutting tool to the toolpost and hand feed a threading operation to trim the sides of the thread.
Problem is: We cannot locate information about:
1. Details of the threadform of the spindle nose thread. Is it 3mm pitch or possibly 1/8th inch or ?
2. What number of teeth were supplied for the stud gear and screw gears? This lathe has been used in a school and gears supplied may have been transposed.
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