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can the machining I have specified be achieved accurately

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  • 19-06-2016 5:48pm
    #1
    aidanki
    Registered Users Posts: 1,262 ✭✭✭


    Hi all,

    I am doing a design to roughen two surfaces so that they grip each other when the bolt holding them together is tightened.

    Please see sketch of what I am talking about attached.

    I guess Im wondering is the design I have done up machinable.

    I'm new to mech design as you may guess.

    All opinions welcome.


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    #2
    phelixoflaherty
    Registered Users Posts: 1,436 ✭✭✭phelixoflaherty


    Machine pocket in lower part the same shape as upper part
    Increase height of upper part same amount
    Bolt together


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    #3
    aidanki
    Registered Users Posts: 1,262 ✭✭✭aidanki


    phelixoflaherty wrote: »
    Machine pocket in lower part the same shape as upper part
    Increase height of upper part same amount
    Bolt together

    cant do that, I need to be able to have the ability to adjust the final position from left to right.


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    #4
    DublinDilbert
    Registered Users Posts: 5,366 ✭✭✭DublinDilbert


    Cutting teeth or gears is not straight forward. You can purchases shafts which already have splines on them and also a mating part which can be bolted down.


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    #5
    aidanki
    Registered Users Posts: 1,262 ✭✭✭aidanki


    DublinDilbert wrote: »
    Cutting teeth or gears is not straight forward. You can purchases shafts which already have splines on them and also a mating part which can be bolted down.

    where would I get such a piece of plate ? I only want a pitch of .5mm deep

    what is the proper name for such a piece of plate


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    #6
    DublinDilbert
    Registered Users Posts: 5,366 ✭✭✭DublinDilbert


    Would you not be better looking at a taper lock? Then you can get any position you like? Many car engine cam pulleys are a taper fit with the centre bolt locking it down.

    http://www.linngear.com/part-type/taper-lock-bushings/


    Your design is more like a slip clutch, you should be able to buy parts for these. Google slip clutch...

    http://www.practicalmachinist.com/vb/general/rotary-thrust-actuator-how-make-282782/


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    #7
    eeguy
    Closed Accounts Posts: 3,478 ✭✭✭eeguy


    It can be done fairly easily on a mill. You could use a 90 degree cutter to make the grooves. If you only have end mills you can jig up your pieces so they're at a 45 degree angle to the end mill.

    Then go down 0.5, across 0.5, down 0.5 ect, until you've cut as many "steps" as you need.
    Then lay it flat and cut the rest of the surface down so the teeth are raised.


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    #8
    Turbulent Bill
    Registered Users Posts: 1,622 ✭✭✭Turbulent Bill


    aidanki wrote: »
    cant do that, I need to be able to have the ability to adjust the final position from left to right.

    If the position needs to be settable in discrete steps, put only one male feature on one component and multiple female features on the other (or vice versa). Having multiple alignments like your teeth show is bad practice.

    If the position just needs to be adjustable, put a slot rather than a hole in the upper part for the screw.


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