Screwcutting problem on Colchester Student 600

  1. esb New Member

    Messages:
    8
    Location:
    Somerset, UK
    The gear ratios were causing the problem, not helped by my initial use of the tumbler reverse... good quality threads every time now! Thanks all, for your help and advice.
     
    skotl, Brad93 and Pete. like this.
  2. Brad93

    Brad93 M J B Engineering

    Messages:
    10,394
    Location:
    Essex
    Does your lathe not have a little plate like this?

    774F349E-8EA5-4B97-80B8-4C737D4DCFB4.png
     
  3. esb New Member

    Messages:
    8
    Location:
    Somerset, UK
    Nope, but that would have been quite helpful! It has a plate on the screwcutting gearbox casing giving gearbox settings for availabler common threads, with mention of exchanging the standard driving gear for a 42T gear to provide additional threads, but nowhere on the machine does it state which gear is the standard one. Thanks to the advice on the forum, I've located a manual which shows 21T standard.
     
  4. esb New Member

    Messages:
    8
    Location:
    Somerset, UK
    I guess I could have worked out the standard gear by comparing the 42T gear threading options with the others, but over the 10 years I've owned the lathe, I've never done any screwcutting, so somewhat lacking in knowledge (and you might say common sense!). All much clearer now.
     
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