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Carbon brushes on circular saw

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  • 28-02-2013 12:24am
    #1
    slpower01
    Registered Users Posts: 277 ✭✭


    I don't know if this is the correct section for this but.... I have a circular saw and in the past year (of not too much use) I have had to replace the carbon brushes twice, Its a 110v hitachi saw thats only a couple of years old but it seems unusual for the carbon brushes to keep shattering.

    Does anyone know what would cause this??

    Thanks,
    Steven Power.
    Tagged:


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    #2
    Irish Steve
    Moderators, Motoring & Transport Moderators Posts: 6,522 Mod ✭✭✭✭Irish Steve


    Only thing I can suggest is to try getting brushes from a different source, depending on who makes them, they can vary significantly in hardness and durability.

    The other possible issue is that if either the supply lead to the 110V transformer, or the length of the lead FROM the 110 transformer is a bit long, if the voltage is low as a result, that might be causing damage to the brushes,

    Shore, if it was easy, everybody would be doin it.😁



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    #3
    slpower01
    Registered Users Posts: 277 ✭✭slpower01


    Irish Steve wrote: »
    Only thing I can suggest is to try getting brushes from a different source, depending on who makes them, they can vary significantly in hardness and durability.

    The other possible issue is that if either the supply lead to the 110V transformer, or the length of the lead FROM the 110 transformer is a bit long, if the voltage is low as a result, that might be causing damage to the brushes,

    Thanks Steve ill try shorter leads and see how I get on :).


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    #4
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    Id say its more likely problems with the brushes or commutator than voltage.

    The commutator it the copper strips the brushes make contact with, which reverse the rotor polarity of each winding as they spin. Just check there is no damage to the commutator itself. It should be shiny copper with no bits missing or damaged.

    Universal motors should be well able for varying voltages supplied to them, although voltage can be a factor alright if the motor is continuously heavily loaded on too low a voltage.


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    #5
    slpower01
    Registered Users Posts: 277 ✭✭slpower01


    Bruthal wrote: »
    Id say its more likely problems with the brushes or commutator than voltage.

    The commutator it the copper strips the brushes make contact with, which reverse the rotor polarity of each winding as they spin. Just check there is no damage to the commutator itself. It should be shiny copper with no bits missing or damaged.

    Universal motors should be well able for varying voltages supplied to them, although voltage can be a factor alright if the motor is continuously heavily loaded on too low a voltage.

    I'll have a look at the commutator tomorrow and see, I noticed today one of my 110 leads is faulty (the one I usually run the saw off) so that may be why.


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