Spindle Mounting Flange on a Cat40 Spindle Cartidge
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  1. #1
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    Default Spindle Mounting Flange on a Cat40 Spindle Cartidge

    Hello All,

    I was cleaning my machine the other night and I noticed that my spindle mounting flange has 6 bolts that are used for mounting, and 6 set screws. Does anyone's machine also have this that would be able to tell me what the set screws are for?

    Big Plus spindle, CAT40, Milltronics VM20IL (Essentially a 4020)

    Sincerely,
    Praxis
    Last edited by Praxis; 05-08-2020 at 09:47 PM. Reason: clarification

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    Set screws to draw the cartridge out.

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    Quote Originally Posted by Garwood View Post
    Set screws to draw the cartridge out.
    I've seen spindles with two jack screw holes, maybe one with 3, but never one with 6. Seems like way overkill if that's the purpose.

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    Quote Originally Posted by Vancbiker View Post
    I've seen spindles with two jack screw holes, maybe one with 3, but never one with 6. Seems like way overkill if that's the purpose.
    I would agree that 6 holes would seem like overkill. 2 or 4 make the most sense.

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    Any chance the builder is intending the screws to be used to "tram" in the spindle?

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    Quote Originally Posted by Vancbiker View Post
    Any chance the builder is intending the screws to be used to "tram" in the spindle?
    If so, it's a pretty crap way of doing it due to the high load contact forces. With a typical six bolt clamping I'd want at least four surrounding screws per bolt, of minimum 70% the bolt size and flat bottoms.

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    Quote Originally Posted by Milland View Post
    If so, it's a pretty crap way of doing it due to the high load contact forces........
    Yep. Shimming like done by Fadal would be preferable. Of course machining/scraping the head geometry accurately would be best of all.

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    I've seen it on an old Santec machine.
    The set screw is to keep the nut from
    coming loose. IIRC the nut was lefthand, too.

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    Just thought I'd update everyone.

    After calling the manufacturer and investigating on my own, they can be used for one of two purposes. They are either plugs that keep the spindle chiller system closed, or coolant ports. In my current configuration my spindle chiller has inlet and outlet ports in the head. I suppose if you hooked up a coolant pump to it, you'd have the style where the coolant keeps the spindle cool instead of the chiller.

    Luckily it only meant me spilling 2 cups of hydraulic oil to verify....

    Thanks for everyone's reply!

    Praxis.

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    And thanks for the update!

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