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  1. #1
    Join Date
    Jul 2007
    Location
    sandstone point queensland
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    67
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    159

    Default myford 7 question

    just purchased a myford 7 ,have a question, when threading can I stop after a pass then wind the carriage back without disengaging the halfnut via the wheel at the end of the lead screw then take another cut ,and so on
    thankyou in advance

  2. #2
    Join Date
    Nov 2007
    Location
    melbourne australia
    Posts
    3,067

    Default

    Iím pretty sure thatís an option on most lathes. Certainly hobby lathes anyway. This might help: https://youtu.be/ksCd9FfjUFQ
    Chris

  3. #3
    Join Date
    Jul 2007
    Location
    sandstone point queensland
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    Default

    thankyou for that info ,now I,m clear on what I imagined ............bob

  4. #4
    Join Date
    Aug 2012
    Location
    Greenmount, W.A.
    Age
    68
    Posts
    233

    Default

    Yes, but probably no. Yes, you can quite often use the handwheel on the leadscrew to wind the carriage back, but you may find that the ratio between the spindle and leadscrew will cause lots of forces on the gear rain that could damage the gear train. The extreme case is say, cutting a thread of 0.5 TPI or courser threads - 0.1TPI or less. Cutting those kind of threads it is usual to drive the spindle from the leadscrew. Forces are better with that arrangement.

    Why on earth would you want such a course thread? Answer: Multi start threads, or rifling in a barrel come to mind.

    Proceed with caution! Probably better to install a motor reversing switch.

  5. #5
    Join Date
    Jul 2011
    Location
    Adelaide
    Posts
    796

    Default

    This works reasonably well on a Super 7 as long as you disengage the clutch.

  6. #6
    Join Date
    Aug 2012
    Location
    Greenmount, W.A.
    Age
    68
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    233

    Default

    I have tried to move the carriage back using the leadscrew handwheel - hard work, and it reeked of breaking something, so I found it easier to rotate the chuck by hand. I was only cutting a short thread - metric by memory. At that time I felt a motor reversing switch (for a single phase motor) would have been a good investment. Being an electrician I had no excuses - except to get the job done quickly! Did I later fit a reveresing switch...... well no, I sold the lathe. Never being able to learn from my mistakes I later purchased a three phase Super 7. Motor rotation is now a simple "flick of the lever"

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