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  1. #1
    AeroE is offline Cast Iron
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    Jun 2010
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    Missouri
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    Default Location of J Head Bridgeport Serial Numbers

    I have a J head vertical mill with a 1 HP motor and speed change via pulleys.

    Where do I find the serial number for this machine? If it's on the knee, it's hiding well.

    The serial number on the head - on the data plate and casting - is J-148488.

    I'm assuming I'll need this information when I order parts.

  2. #2
    Join Date
    Nov 2005
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    Lightbulb

    The s/n is stamped in the top of the knee under the chip shield in large letters.

    Move the table all the way to the rear, then move the chip shield to the rear to reveal the number.

    - Leigh

  3. #3
    AeroE is offline Cast Iron
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    Default Thanks, good thing it wasn't a snake!

    The chip guard is missing. The serial number was obscured by a nice thick layer of congealed brown oil.

    The list at metalwebnews ages the machine at 1972.

    Does the 12 over BR have siginificance?

  4. #4
    Ohio Mike is offline Stainless
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    Default

    That indicates its a 12" knee. The older "BR" serial numbers are for the 9" knee (including round ram body mills).

  5. #5
    morsetaper2 is offline Titanium
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    Gaithersburg, MD USA
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    Default

    Quote Originally Posted by AeroE View Post
    Does the 12 over BR have siginificance?
    I'm pretty sure it designates travel of knee way. I believe there was both a 9 & 12 inch knee available??

    Edit: I see Ohio Mike is faster on the keyboard than me :-)
    Last edited by morsetaper2; 12-27-2010 at 05:40 PM. Reason: Ohio Mike Types faster than me :-)

  6. #6
    Ohio Mike is offline Stainless
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    Oct 2008
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    Default

    Following up with a question of my own... Does anyone know when they introduced the 12" knee travel?

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