Bridgeport Sine Plate
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  1. #1
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    Default Bridgeport Sine Plate

    Looking for info on the smaller
    Bridgeport Sine plate. 5" x 7"
    I know that part, was wondering
    about the size of the Tee slots,
    weight and rigidity to do light
    to medium duty milling.
    Thanks
    bob

  2. #2
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    Default

    I have one here that we used to use a lot. Not much anymore. It has one T-Slot across the middle that's will hold 3/8 T-Nuts. We mounted a 13 X 9 tooling plate on it with 3/8 tapped holes every inch (about 80 holes). The sine plate itself is 7" across and 6" deep and about 2.5" thick when closed. So that's about 29 pounds if I calculated it correctly. You can do medium to heavy machining if you put braces on each of the sides. The braces would consist of 1/4" steel ground stock with a clearance slot for 1/4-20 screws.

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    Default Sine Plate

    Moldcore,
    Thanks for the info on the sine plate
    From what you described it is exactly
    what I am looking for. I like that 29
    pound weight. Are you inclined to part
    with it? If so PM me with an offer I
    can't refuse.
    spaeth






    Quote Originally Posted by moldcore View Post
    I have one here that we used to use a lot. Not much anymore. It has one T-Slot across the middle that's will hold 3/8 T-Nuts. We mounted a 13 X 9 tooling plate on it with 3/8 tapped holes every inch (about 80 holes). The sine plate itself is 7" across and 6" deep and about 2.5" thick when closed. So that's about 29 pounds if I calculated it correctly. You can do medium to heavy machining if you put braces on each of the sides. The braces would consist of 1/4" steel ground stock with a clearance slot for 1/4-20 screws.

  4. #4
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    Default

    It's not mine personally so I can't sell it and I'd like to keep it around just in case. The individual that owns it has retired because of illness but said I can use it whenever I want to.

  5. #5
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    Moldcore,
    I do understand, But now I'm sure it is the
    right one based on your info. There are probably
    some collecting dust that need a good home so
    perhaps another PM member has one for sale.
    Thank You
    bob

  6. #6
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    Default

    Quote Originally Posted by spaeth View Post
    Looking for info on the smaller
    Bridgeport Sine plate. 5" x 7"
    I know that part, was wondering
    about the size of the Tee slots,
    weight and rigidity to do light
    to medium duty milling.
    Thanks
    bob
    Here’s one on the bay, no affiliation with the seller;

    Bridgeport Milling Machine Small Sine Plate | eBay

    I have the larger plate, Suburban still makes the larger size!

    Bridgeport made two styles of the larger size plate, one was single and the other was a compound sine plate......I think the original maker may have been Tri-Sine?

    Kevin

  7. #7
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    The one we have here does not have the 90 deg back plate like the one shown on eBay, it's just a flat top plate. The price for the one on eBay seems high for what it is but I haven't shopped for these in decades. Mine has a tag that says "Made for Bridgeport Machines by Custom Tool and Machine".

  8. #8
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    I checked the e-bay listing and thought
    the price too high, especially not knowing
    anything about how well it's been taken
    care of. Pics looked ok-ish but for that
    money I'd like to have input from the guy
    that has had to indicate it in. I bought a
    new "precision angle table" from e-bay that
    looked nice but is all over the place within
    .015 over 10". Need a lot of shim stock and
    too much fooling around to get close. I like
    the back plate idea. I'll keep looking.
    Thanks men for the replies.
    spaeth

  9. #9
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    The Hunt is off. I've located and purchased
    a nice sine plate to meet my needs. Twas not
    the 5x7 BP one but a very nice 6x12, longer
    than wide, which is what I wanted and weighs
    39 lbs.
    spaeth

  10. #10
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    Default

    Saeth,
    Please refrain from hitting the "Enter" at the end of every sentace. Its' a lot easier to read it you use a period and go on.
    JR


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