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Thread: Our New Lathe Arrived This Morning.

  1. #16
    Join Date
    Feb 2003
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    Houston, Texas
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    7,581
    Quote Originally Posted by michaeljp65 View Post
    Can i ask what are you going to be using that lathe for? What sort of manufacturing do you do?
    We are in the Marine Machine Shop Business. We will do anything that comes out of a shipyard, but our specialty is new construction and repair on Prop Shafts, Rudder Stocks, Steering Systems and Shaft and Rudder Bearings for Inland Tugboats. We also specialize in align boring the shaft bearing fits in various vessels.

    The typical shafts we machine are between 24 and 36 feet long, 6” to 10” in diameter.

  2. #17
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    Jan 2017
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    Australia
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    50
    Quote Originally Posted by jackie schmidt View Post
    We are in the Marine Machine Shop Business. We will do anything that comes out of a shipyard, but our specialty is new construction and repair on Prop Shafts, Rudder Stocks, Steering Systems and Shaft and Rudder Bearings for Inland Tugboats. We also specialize in align boring the shaft bearing fits in various vessels.

    The typical shafts we machine are between 24 and 36 feet long, 6” to 10” in diameter.
    Thanks for your reply. that would be incredible to see in action. Have you any videos of you machining a shaft of that diameter?

  3. #18
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    Feb 2003
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    Houston, Texas
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    Quote Originally Posted by michaeljp65 View Post
    Thanks for your reply. that would be incredible to see in action. Have you any videos of you machining a shaft of that diameter?
    I have some, but while I can download pictures, the sight will not take videos unless put on YouTube.

  4. #19
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    Jan 2017
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    Australia
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    All good thanks mate.

  5. #20
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    Feb 2003
    Location
    Georgetown, Texas
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    464

    Tight fit through the spindle

    Yeah, but will it chamber an unlimited barrel? Tim

  6. #21
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    Dec 2017
    Location
    Idaho
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    388
    Talk about overkill! Nicely done Sir!

  7. #22
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    Feb 2003
    Location
    Houston, Texas
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    We had two of these delivered yesterday. I also finished fabricating a new steady rest. We are putting the first job in it Monday.

    http://benchrest.com/attachment.php?...1&d=1576790229

    http://benchrest.com/attachment.php?...1&d=1576790968
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    Last edited by jackie schmidt; 12-19-2019 at 05:29 PM.

  8. #23
    Join Date
    Feb 2019
    Posts
    359
    Seems appropriate————Starting a new job on Christmas Eve; what a Scrooge.

  9. #24
    Join Date
    Jul 2016
    Location
    Surprise, AZ
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    Quote Originally Posted by jackie schmidt View Post
    We had two of these delivered yesterday. I also finished fabricating a new steady rest. We are putting the first job in it Monday.

    http://benchrest.com/attachment.php?...1&d=1576790229

    http://benchrest.com/attachment.php?...1&d=1576790968
    That toolpost needs something in the picture so we A/B/C guys can see how big an EA is.

    GsT

  10. #25
    Join Date
    Feb 2003
    Location
    Houston, Texas
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    Quote Originally Posted by GeneT View Post
    That toolpost needs something in the picture so we A/B/C guys can see how big an EA is.

    GsT
    http://benchrest.com/attachment.php?...1&d=1576850726
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  11. #26
    Join Date
    Feb 2006
    Location
    California...unfortunately
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    672
    That toolpost may weigh more than one of my lathes.

    Hey Jackie...what kind of tolerances can you expect to hold on a long cut, say 24', on the new lathe?

    Justin

  12. #27
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    Feb 2003
    Location
    Houston, Texas
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    Justin, when machining long shafts, you do the cuts in sections around 5 or 6 feet in lengths, depending on the diameter.Since it always supported by a steady rest, you adjust it to where the Lathe is cutting dead straight in that length. Then you move the steady rest, readjust and star again. Often, depending on the length of the shaft, you will often have a steady feast on each side of the carriage.

    It is up to the skill of the machinist to know how to not only adjust the rest to where the Lathe is cutting straight, but also how much upward pressure to exert with the steady rest.

    As a note, we never use a top on a steady rest. Here is a picture of one of men machining a Rudder post. While shorter than a prop shaft, you can see how the steady rest is used.

    http://benchrest.com/attachment.php?...1&d=1576899619
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    Last edited by jackie schmidt; 12-20-2019 at 11:42 PM.

  13. #28
    Join Date
    Jul 2016
    Location
    Surprise, AZ
    Posts
    244
    Quote Originally Posted by jackie schmidt View Post
    Justin, when machining long shafts, you do the cuts in sections around 5 or 6 feet in lengths, depending on the diameter.Since it always supported by a steady rest, you adjust it to where the Lathe is cutting dead straight in that length. Then you move the steady rest, readjust and star again. Often, depending on the length of the shaft, you will often have a steady feast on each side of the carriage.

    It is up to the skill of the machinist to know how to not only adjust the rest to where the Lathe is cutting straight, but also how much upward pressure to exert with the steady rest.

    As a note, we never use a top on a steady rest. Here is a picture of one of men machining a Rudder post. While shorter than a prop shaft, you can see how the steady rest is used.

    http://benchrest.com/attachment.php?...1&d=1576899619
    Do you profile your own barrels? If so, how does your technique differ when the shaft is scaled down that much?

    Thanks,
    GsT

  14. #29
    Join Date
    Feb 2003
    Location
    Houston, Texas
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    We put the first job in our new Lathe today.

    I had to do the final straightening of the shaft and install the coupling to check for any run out. These are two 35’ 8.5 inch diameter shafts that we double end machined in one 32’ Lehman Lathe earlier before we bought this machine.

    If the coupling face runs out more than .002, we take a very light skin over the face to insure it runs dead true.

    http://benchrest.com/attachment.php?...1&d=1578785449

    http://benchrest.com/attachment.php?...1&d=1578785533
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    Last edited by jackie schmidt; 01-11-2020 at 07:52 PM.

  15. #30
    Join Date
    Jan 2009
    Location
    Ca.
    Posts
    585
    Thank you for sharing Jackie your explanations along with your pictures have always made your means and methods easy for myself to understand. I can now see and understand how much of a benefit this lathe really is to your shop and how it will end up paying for itself. Please keep on sharing I can't speak for the others but you have taught me more than you might ever come to realize over the years.

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