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  1. #1
    jonfritch is offline Aluminum
    Join Date
    Jul 2006
    Location
    Little Rock Arkansas US of A
    Posts
    98

    Default Commutator refinishing?

    I know I'm just missing something I should already know, but I'm having one heck of a time getting a smooth finish on the copper armature segments of a series wound motor with brushes. I get bumps and boogers instead of smoothness. So, all you great guys, how should I sharpen my HS tool to cut copper?

  2. #2
    rons is offline Stainless
    Join Date
    Mar 2009
    Location
    San Jose, CA. USA
    Posts
    1,398

    Default

    Your question should include what method you are using. Such as:

    I have the armature chucked onto my lathe and....

  3. #3
    WSnyder is offline Aluminum
    Join Date
    Dec 2008
    Location
    AZ USA
    Posts
    176

    Default

    This is the tool I use, hand ground and honed sharp. It is narrow because some armatures I do have a balance ring right up next to the commutator.
    Attached Thumbnails Attached Thumbnails img_0620.jpg   img_0621.jpg   img_0622.jpg  

  4. #4
    tos grinder is offline Plastic
    Join Date
    Mar 2009
    Location
    peterborough,ontario
    Posts
    2

    Default

    I worked at General Electric for almost 25 years and finished comms from 8 inch to 38 inch. We used a diamond finishing tool. About 25 degrees and slow feed. Small radius on tip. Try the same for HSS. The worst part was deburring after finishing the comm.

  5. #5
    gas pumper is offline Cast Iron
    Join Date
    Jun 2009
    Location
    Boonton, NJ
    Posts
    299

    Default

    I did this in the 60's,and 70's.

    The radiused tool shown will work the best and give you a finish that won't need to be touched after turning.

    Spin it fast, like it was alluminum. slow feed. no coolant or oil. light cuts.

    I hated cleaning out (relieving) the mica without screwing up the copper.

  6. #6
    jonfritch is offline Aluminum
    Join Date
    Jul 2006
    Location
    Little Rock Arkansas US of A
    Posts
    98

    Default Thanks, Everybody

    Thanks for the responses. Wish me luck!

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