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Woodturning.

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    #32
    woodturner
    Registered Users Posts: 879 ✭✭✭woodturner


    kadman wrote:
    Nice one, who's Peter?

    The owner of The Toolpost in the UK.


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    #33
    kadman
    Moderators, Home & Garden Moderators Posts: 5,098 Mod ✭✭✭✭kadman


    woodturner wrote: »
    The owner of The Toolpost in the UK.

    Site wont open for me??


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    #34
    delaney001
    Registered Users Posts: 431 ✭✭delaney001


    kadman wrote: »
    Site wont open for me??

    http://www.toolpost.co.uk


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    #35
    kadman
    Moderators, Home & Garden Moderators Posts: 5,098 Mod ✭✭✭✭kadman


    The shaft details of this machine are a better kept secret than the Vatican files.

    Centauro Italy have been contacted, but no word yet. Looks like a trip to the nearest
    engineering outfit, for their input.


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    #36
    kadman
    Moderators, Home & Garden Moderators Posts: 5,098 Mod ✭✭✭✭kadman


    Finally established that the shaft thread and type on my lathe is,

    M39 x 4 pitch measurement.

    So at least I know what I,m looking for. I thought M39x4 was an oddity,
    but apparently not.


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    #37
    kadman
    Moderators, Home & Garden Moderators Posts: 5,098 Mod ✭✭✭✭kadman


    To date, I have been unable to source a chuck to suit my lathe.

    Either with a chuck insert, or even a suitable blank, that can be
    re machined to suit my needs.

    Problem occurs when the lathe threads are above 33mm. Mine
    is an M39. So the shaft size creeps well above the direct fit
    into the M33 of the larger chucks.
    This necessitates a larger billet being needed where the two machinings
    and sizes come into close proximity to each other.

    Still waiting on e mails from 2 large suppliers. But I,ve also got e mails
    from 2 others who say they are not in a position to help.

    Looks like my own cad design, and a trip to the local works, plus loads
    of denaries. Pushing up the expense slowly


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    #38
    kadman
    Moderators, Home & Garden Moderators Posts: 5,098 Mod ✭✭✭✭kadman


    I suspect its something like this I need.

    But my german is scheissen

    http://www.drechselstube.de/spanntechnik/adapter/4008.html


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    #39
    woodturner
    Registered Users Posts: 879 ✭✭✭woodturner


    No you don't want a chuck adaptor. These bring the chuck further out from the headstock and can increase wear on the lathe bearings. If you look up the Oneway Stronghold chuck you'll see how it's machined. Peter Hemsley said it was possible to thread the backplate for M40 so I can't see why threading it M39 should be any harder


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    #40
    woodturner
    Registered Users Posts: 879 ✭✭✭woodturner


    These go directly into the chuck and only the flat flange protrudes from the back of the body of the chuck.


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    #41
    woodturner
    Registered Users Posts: 879 ✭✭✭woodturner


    Hope this helps.


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    #42
    kadman
    Moderators, Home & Garden Moderators Posts: 5,098 Mod ✭✭✭✭kadman


    I checked Toolpost before, but my thread type was not listed.

    So I didn,t follow up there. I,ve sent on all the spec now.

    Fingers crossed


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    #43
    woodturner
    Registered Users Posts: 879 ✭✭✭woodturner


    Hope you get sorted. On the Oneway site they have a backplate threaded for M40x6 so they should be able to look after you.


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    #44
    kadman
    Moderators, Home & Garden Moderators Posts: 5,098 Mod ✭✭✭✭kadman


    woodturner wrote: »
    Hope you get sorted. On the Oneway site they have a backplate threaded for M40x6 so they should be able to look after you.

    But is back plate set up suitable on the one way chuck.

    Or is the one way chuck threaded fora shaft setup?


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    #45
    woodturner
    Registered Users Posts: 879 ✭✭✭woodturner


    Each backplate they make is threaded for a specific lathe. The chuck comes without the backplate (has no threads at all) You order the chuck and the backplate suitable for your lathe. You'll see on their list they don't have the one you need but they do custom make them for customers.


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    #46
    kadman
    Moderators, Home & Garden Moderators Posts: 5,098 Mod ✭✭✭✭kadman


    So you are saying the chuck is a backplate mount arrangement, and not a direct thread
    onto my lathe shaft??


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    #47
    woodturner
    Registered Users Posts: 879 ✭✭✭woodturner


    None of the chucks come directly threaded, they are supplied with whatever backplate suits your lathe.


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    #48
    kadman
    Moderators, Home & Garden Moderators Posts: 5,098 Mod ✭✭✭✭kadman


    woodturner wrote: »
    None of the chucks come directly threaded, they are supplied with whatever backplate suits your lathe.


    So what is the backplate mounting diameter on the back of the chuck??

    Maybe I can use existing backplates from my own 3 jaw chucks, if the diameter suits.

    Still no joy from any chuck manufacturer, and toolposts e mails are problematic.


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    #49
    kadman
    Moderators, Home & Garden Moderators Posts: 5,098 Mod ✭✭✭✭kadman


    Got it.

    So the threaded insert for the oneway and strong hold chucks
    work like this.

    Female end of insert fits onto my lathe shaft.

    And the unthreaded male end of the shaft is an interference fit
    into the new check.

    Held on to the new chuck with 2 bolts, in line with the axis of
    my lathe shaft, bolted into the rear face of the new chuck.

    Clear now.

    So the chuck and bowl blank rely on the strength of a 6mm or 8mm
    blts to with stand the torsional forces applied to them by the out of
    balance bowl blank, and shaft speed. Okayyyyy.

    Gotcha.

    So all i want is an M39x4 insert and 1 Talon chuck.

    But computer says no on the insert, and no word on the blank yet.


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    #50
    kadman
    Moderators, Home & Garden Moderators Posts: 5,098 Mod ✭✭✭✭kadman


    Just sent Toolpost another email.


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    #51
    woodturner
    Registered Users Posts: 879 ✭✭✭woodturner


    They'll machine an insert to suit your lathe, probably an extra cost. The stronghold chuck is larger than the talon chuck. It'll recommend what chuck will suit your lathe. If your lathe has a large swing the larger chuck would probably be better.


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    #52
    kadman
    Moderators, Home & Garden Moderators Posts: 5,098 Mod ✭✭✭✭kadman


    woodturner wrote: »
    They'll machine an insert to suit your lathe, probably an extra cost. The stronghold chuck is larger than the talon chuck. It'll recommend what chuck will suit your lathe. If your lathe has a large swing the larger chuck would probably be better.

    Got an e mail from Peter.

    At the moment he cant help me out, as he says the M39x4 is unusual and he has never come across it.
    Strange.

    I,ve asked him if he can supply me with a blank insert that I can get machined here.


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    #53
    woodturner
    Registered Users Posts: 879 ✭✭✭woodturner


    Have you emailed Oneway themselves? It says on their site they can be made to suit certain lathes. Maybe they will be able to machine it for you.


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    #54
    rossit
    Registered Users Posts: 1,126 ✭✭✭rossit


    i finally got a size on the chuckor face plate i need its a 35mm with a 4 mm pitch . do ye know any websites i can visit or even beter any shop that sell woodturning tool around the southeast. thanks guys great thread


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    #55
    kadman
    Moderators, Home & Garden Moderators Posts: 5,098 Mod ✭✭✭✭kadman


    Long story short.

    One vicmarc supplier says they can get vicmarc,OZ to machine the required part.

    Vicmarc Oz says they can machine the part required by cnc. Great. But they

    cant guarantee it will fit. Even tho my M39x4 is a recognised industry thread.

    Toolpost uk will supply me with a blank that I machine myself. Great.

    But I have to select the chuck parts individually to make up my chuck.

    And then tell me I choose a set of mounting jaws, as well as workholding jaws.

    As I know nothing about the versachuck, confusion has set in.

    God be with the days when i could just buy the right box, with the bits in:)

    So if anyone can tell me the difference between workholding jaws and

    mounting jaws, I,d be greatful as the Versachuck probably ticks the most boxes


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    #56
    Alun
    Registered Users Posts: 21,466 ✭✭✭✭Alun


    The thing with the Versachuck is that it's possible to use (workholding) jaws from a number different manufacturers on it.

    Workholding jaws are the jaws you use to, well, hold your work in !!! These screw on to the jaws that are part of the chuck itself, the mounting jaws, and the shape and size of these along with the position and size of the mounting holes determine what workholding jaws you can use.

    So basically you need to decide what range of workholding jaws you think offers you the biggest choice and choose the mounting jaws to match. You'll probably get the biggest, and easiest obtained, combined choice by going for the one that takes both Teknatool(Nova/SuperNova) and Robert Sorby(Patriot) jaws.

    Look here for details on the system http://www.toolpost.co.uk/pages/Chucks___Accessories/VersaChuck/versachuck.html

    I wouldn't worry about them not guaranteeing the backplate will fit .. i'm guessing they're just covering themselves. It is a standard, albeit unusual, thread after all.


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