[Jewelry making - Article 00134] - Re: [Orchid] Bench Grinder and Polisher

[Judy Willingham]

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Hello Janet,

    You asked, "Does a standard (hardware store) bench grinder have the
    necessary rpm's to be a polisher? I always thought grinders were
    considerably slower than polishing motors." 

    Your thinking is correct. If one checks the motor spec plate, the
    rpms should be listed. My grinder rotates at 1750 rpm and my polisher
    rotates at 3600 rpm; therefore, the polisher motor turns about twice
    as fast as the grinder motor. (No doubt other motors have different
    speeds.) The other noticeable difference is that the grinder motor
    (at least budget models) doesn't maintain the rpm speed when one
    tries to polish with it - I'd say the motor "lugs" down. That means
    although grinder unit does polish, it takes more time than the
    polisher. 

    I was SOOoooo happy when I got my polisher and put the grinder back
    to its intended use. 

Judy in Kansas, where evening are cooler. Days are still hot.

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