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Thread: re QCTP's

  1. #1
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    Default re QCTP's

    question for the learned , i have a cq6230 lathe ( or al400 equiv ) it has a 12" swing i would like to get a qctp for it from what i can see i can use either an AXA or a BXA with the axa it is on its limits cos it does up to 12 " swing , the bxa does 10 to 15" swing so what would be the better option get the axa or would there be an advantage having the bxa . never having used one at all i cant tell , would the bxa be a lot bulkier ( is that a word ) and or would the axa flex more ????.
    thanks

    johno
    'If the enemy is in range, so are you.'

  2. #2
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    Not sure over the pros and cons of each,but would think if one only goes as far as 12" you would be silly not to go for the one that does 15" max.

    If one might be flimsy going to 12" max then the other would be just as flimsy going to 15" max.

    Just buy the BXA.

  3. #3
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    Ueee is offline Blacksmith, Cabinetmaker, Machinist, Messmaker
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    Hi Johno,
    The main thing to check is the height from the top of the compound to the center. I think a BXA needs at least 30mm if you use 16mm tools. The aloris site has all the You will not find the BXA too bulky, i think they are a good size, and rigid enough to take 3mm DOC's with negative rake carbide on one of my machines.
    Having said that i think i am going to get a Multifix clone from create tools for the C10 http://www.createtool.com/index.asp Something else to think about, but not as cheap as the Aloris type.

    Ew
    1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.

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    Johno,

    It's not only the swing that determines the best size, the height from the top of the compound slide to the spindle axis can be relevant. Your preferred size of tool shank comes in here because if the compound-to spindle axis height is limited you might have trouble with your preferred tool shank size leaving the cutting edge above centre.

    BXA tool holders accommodate larger tooling (that's good) but have more metal under the tool shank than AXA, so the lowest position of a given cutting tool is higher than with an AXA system.

    Cheers,
    Bill

    Edit - typing too slow!

  5. #5
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    I recently had to decide the same thing, AXA vs BXA for my AL960b. I wanted to do the deepest cuts possible for my machine and figured the limitation of 12mm tools with the AXA was the deciding factor. I heard that BXA could be bulky, but that was not the case for me. My BXA is excellent. Perfect size, does not get in the way at all, can easily see the work and takes both 12 and 16mm tools. Glad I went with the BXA!

    PS if you want to get good quality but do not have the budget for Aloris, then go through Use-Enco in the US. They have Phase II which are reputed to be the best of the Chinese tool posts. Mine is excellent and I am glad I purchased it.

  6. #6
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    just did a measure of the top of compound to centre of spindle and it is 28.2mm so ill call it 28mm . i use mainly 12mm tooling or smaller sometimes with a multitude of pesky shims .i take smaller cuts mainly 40 or 50 thou would be about as deep as i cut most of the time .

    johno
    'If the enemy is in range, so are you.'

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    If that's the case spend the money on HSS and stay with what you have.

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    Quote Originally Posted by texx View Post
    just did a measure of the top of compound to centre of spindle and it is 28.2mm so ill call it 28mm . i use mainly 12mm tooling or smaller sometimes with a multitude of pesky shims .i take smaller cuts mainly 40 or 50 thou would be about as deep as i cut most of the time .
    johno
    Sounds like you have made up your mind for an American type toolpost. If much of what you do is small and intricate jobs, you are best served with the smaller AXA. The larger BXA can get in the way and hides what you need to see.

  9. #9
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    Hi Johno,
    Before committing to a particular QCTP, check the ability to mount the tool of choice and maintain clearances from your rotating centre with a typical work diameter.
    You will quickly find that even HSS needs to be mounted in a holder just to get clearances.
    John.

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