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  1. D

    Help needed with Wolf Jahn tailstock

    Wefalck, I meant the flat pivoted link that joins the lever to the body has been renewed.
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    Help needed with Wolf Jahn tailstock

    I understand you now, but I still have to disagree. The sleeved tailstock is the historical interest. Once the cam hole is milled, all evidence is covered up.One example of a sleeved tailstock is shown in post 33. Here it is obvious why. Intuitvely I also assumed that all tailstocks were made in...
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    Help needed with Wolf Jahn tailstock

    You confuse me. The first picture show the collet holding spindle in place. It fits the sleeve, and holds 8mm collets.The drawbar is not present. Pics 2 and 3 show with the spindle removed, to illustrate the problem, which is that there is no cutout for the camlock. Or are you crticising the...
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    Help needed with Wolf Jahn tailstock

    Thanks Jerry, while I believe this to be un-altered and original, it has become for me of purely historic interest. I shall be doing nothing more to it. Thanks for everybody's help. Dave.
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    Help needed with Wolf Jahn tailstock

    double post
  6. D

    Help needed with Wolf Jahn tailstock

    No, what you see is the smaller bore for the collet meeting the slighly larger bore for the drawbar. There's no loose tube, but it's not a bad idea for clamping.
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    Help needed with Wolf Jahn tailstock

    Please see first post
  8. D

    Help needed with Wolf Jahn tailstock

    No problem Betzel. I am a great admirer of all things Boley, and can find no measurable difference in spindle position, locked or free. Same goes for other makes. It just shows that theory does not always apply to real life. Re. the original post, while I could easily find some way to lock the...
  9. D

    Help needed with Wolf Jahn tailstock

    I have never said the Boley clamping system was wrong, just that it was no more centralised than many other systems. Yes, a few microns of theoretical movement until many years of wear takes place. That is true of many makes.
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    Help needed with Wolf Jahn tailstock

    Thanks for showing that. I like the idea of a brass plug - one could be fitted by drilling upward through the bed clamp hole. Such a plug would eliminate any tendency for the friction of the cam to move the runner backwards or forwards. The upwards pushing tendency applies to many respected...
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    Help needed with Wolf Jahn tailstock

    Yes, an eccentric would have some tendency to axial movement if it pushes directly onto the runner, but the main upwards movement applies for many tailstocks,including Boley. (incidentally, if we were having this chat when it was first decided to weaken the body casting with such a cutout for...
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    Help needed with Wolf Jahn tailstock

    Do you mean like this Pultra split cotter lock? If so it could work, but the WJ hole is rather small. The cotters take up a lot of the available space. I estimate it would leave only 2-3 mm for the clamp bolt - surely they would have made a larger hole? When I first posted I had in mind...
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    Help needed with Wolf Jahn tailstock

    Split cotters would work if my ts. had a cutout to expose the runner. although, it would be rather flimsy. If the cotter od. was 6mm the through bolt would be about 3mm, and when cut to half diameter might just be ok. Just for interest I show another clamp system, this is a Derbyshire lathe.
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    Help needed with Wolf Jahn tailstock

    If that is the runner seen through the hole, then the hole sees far too high for any locking system I can think of, including camlock, wedge or split cotter..It sure is a mystery.(slotted ring clamps as per Boley would of course tend to push the spindle out of alignment in the same/opposite way...
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    Lorch lathe dissamsembly

    It is all too rare to have the viewpoint of someone with a background in both horology and tribology. I welcome it.
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    Lorch lathe dissamsembly

    It is all too rare to hear the views of someone like Steve who has experience in both horology and tribology. I welcome it.
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    Lorch lathe dissamsembly

    Interesting advice - thanks.
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    Help needed with Wolf Jahn tailstock

    Similar, but please read the original posting to understand.
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    Help needed with Wolf Jahn tailstock

    Interesting - if you found a catalogue picture showing an empty hole then I shall do nothing to alter mine. I was thinking that perhaps they had in mind a camlock, which then marred the surface of the spindle Perhaps they then used up old stock castings without a lock. Just idle conjecture, of...
  20. D

    Help to identify lathe accessories

    Many (all?) original pins are actually a T shape with the part inside the spindle in the shape of a rectangle to engage the collet groove, in other words longer than the diameter of the pin. This makes it impossible to push it upwards.

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