Cutting Threads moving away from headstock , running lathe in reverse - Page 2
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  1. #21
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    A slug of 4140 isn't what I would call mild steel. The novice threader would be better served practicing on a slug of some gummy hot rolled steel. It would teach him (or her) the importance of a sharp tool, the correct depth of cut and lubrication. Once the novice has mastered chucks of HR, then most anything else will be a breeze.

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  3. #22
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    Delrin is a good practice material. Pretty forgiving. Brass likewise.

    I avoid the term 'lubricant' because then folks tend to put a lubricant on the workpiece.
    "Cutting fluid" is better. For hot rolled steel one of the best is that black sulfized cutting oil,
    available in small containers in the HD plumbing section.

  4. #23
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    We always called a small piece of steel/material that did not have a designated need purpose a slug..just means one can use it for any purpose.

  5. #24
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    worrying about a chuck coming unscewed was never a concern of mine for a relatively low speed low force operation like threading.

    excellent practice is old bolts...turn of the head, rechuck it and pick up the thread...
    encompasses several things at once....try and youll understand the challenges.

    obviously you want bolts that are not fully threaded.
    you really shouldnt be reusing all those old head bolts anyway...

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