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Thread: Bridgeport Series 1 and 2 differences

  1. #1
    Join Date
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    Question Bridgeport Series 1 and 2 differences

    Is there a place that details the differences between a Series I and Series II Bridgeport?

    I see several references to both Series models, but have not quite figured out the differences. Really - I am too lazy to look at the listings on all the places that has them for sale and figure it out.

    You all being the SME's (Subject Matter Experts) someone surely has a simple list.
    ~ TheShooter
    Molon Labe! (
    "Come and take them!")
    "It is seldom that liberty of any kind is lost all at once." óDavid Hume
    NRA Certified Home Firearm Safety & Basic Pistol Instructor

  2. #2
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    Series II is like a Series I on steriods. 2,200 lbs vs 5,000 lbs for starters. Series II has much lager head and with DC motor on quill feed. No. 40 spindle vs R8. Integral power feed on X axis on II. II has wider/longer table, more travels, square ways on Y.

    The main disadvantage of II is the head is so large that tilting it becomes such a PITA that one is almost never inspired to actually do so. Hence, the Series II "Special" model with II body and I head. Actually more desirable and sought after than the Series II.

    Of course just to confuse matters, sometime in the mid 1990's Bridgeport dropped the Series II and only offered the Series II Special....but then since if was no longer "Special" they dropped the "special" in the name and just called it a Series II !!! So, multiple dope slaps to the slackards at Bridgeport for that one, but hopefully this is clear as mud.

  3. #3
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    Think of it this way- A series II compares to a series I much as the series I compares to a mill-drill I'm not joking, after using the series II special at work my series I seems very toy-like.

    Ed

  4. #4
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    Like D Thomas said, the Series 1 machines are worth more money, with Series II's bringing in surprisingly little (usually in the neighborhood of 3 or 4 grand), and are often thoroughly beaten - one does not buy a $40K dollar manual mill(I'm not kidding, that's what they went for circa 1994) to do light work. Also contributing to the problem is the dirth of spare parts - while the Series 1 is basically an updated "J" machine, which means alot of the parts are interchangeable, the Series II is a whole nother animal. Interestingly enough, the Series II appears to be the basis of some of the Boss series CNC machines.

    Series 1:


    Series II:



    HTRN
    EGO partum , proinde EGO sum

  5. #5
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    Nov 2002
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    Mine is a Series I Rigid Ram mill without any manual handles for the X, Y or Z axis. Sturdy is a good description but it is useless without a program or its controller.

  6. #6
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    Quote Originally Posted by HTRN
    Like D Thomas said, the Series 1 machines are worth more money,
    No they aren't and that's not what I said. A pristine Series II generally brings more money than a pristine Series I, even today. But what is really sought after, is the Series II Special...which is a Series II body with Series I head. Except after the mid 1990's they dropped the "special" moniker, such that all of the later "big Bridgeports" are Series II body and Series I head.

  7. #7
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    I'm glad the question was asked, then. I had thought that the difference between the Series I and Series II was the continuously variable spindle speed system. But that's just a couple of variations on the Series I, apparently.

    I have a Series I with the step-pulley spindle, and I use a VFD to provide (three phase power and) fine variable speed. Once in a while, I move the belt on the step pulley, slightly more often I just switch between high and low range. The speed and direction control is handled by adjusting the VFD.

    I think my setup is actually superior to the variable speed head, because the head is much simpler and easier to fix. The VFD is easy on the machine because it has a soft start for the motor rather than the "jerk" start of just flipping the drum switch.

    Why isn't this better? (..than a variable speed head, not a Series II)

    -Mark

  8. #8
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    Mark,
    It is better. If VFD's had been around Bridgies may have gone this route.
    I have a varispeed head machine, not by choice , it was what came up but if I had to make a choice I'd go step speed with VFD.
    The Varispeed heads are noisy and prone to wear on the sheathes but in their heyday there wasn't much of a choice.

    .
    .

    Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.




  9. #9
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    The Varispeed heads are noisy and prone to wear on the sheathes but in their heyday there wasn't much of a choice.
    After changing the belt to change speeds on an older model BP (over and over what'a PITA), I would take the chance on the Varispeed as well. It was a fantastic upgrade at the time.

    But I agree, a VFD solves so many issues.

    Nice thread by the way. Thanks for starting it Shooter.

    rock-
    Civil engineers build targets, Mechanical engineers build weapons.

  10. #10
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    Quote Originally Posted by rockrat
    After changing the belt to change speeds on an older model BP (over and over what'a PITA),
    OK...on the Series 1's (8 spd J head) and the BP 8 spd clones...just how involved is a belt/speed change? Surely it can't be worse than my mill/drill where you have to climb up into the thing with wrenches to loosen and tighten bolts...all the while jerking on the swivel motor mount to tension the works.
    Thanks!
    Russ
    I have tools I don't even know I own...

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