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Thread: Drilling Reduction Gear Foundation For Body Fit Bolts......Marine Gear Installation

  1. #1
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    Drilling Reduction Gear Foundation For Body Fit Bolts......Marine Gear Installation

    I have spent the last couple of days down in the engine room of a new 2600 HP Tug thatís being built at San Jac Marine.

    https://www.youtube.com/watch?v=gR_PJrgG3sE

    We do quite a bit of this, for both new construction and replacement gears. The Body Fit Bolts keeps the reduction gear, which takes the thrust of the propeller, from any movement during normal operation. The gear is set on Chockfast, a pourable hard setting chocking compound. (Think glass bedding a Action).

    https://itwperformancepolymers.com/p...ockfast-orange

    The bolt bodies are .937, the thread is 7/8 NF. I use 1 inch grade bolt blanks to machine the bolts.

    The air drill is a #3 Ingersoll Rand. I drill the holes with a 7/8 drill and then ream them with A 15/16 core drill. The bolts are installed with .001 interference. I dip them in liquid nitrogen for about 5 minutes and slip them in.

    http://benchrest.com/attachment.php?...1&d=1590026882

    http://benchrest.com/attachment.php?...1&d=1590026966

    http://benchrest.com/attachment.php?...1&d=1590027042

    http://benchrest.com/attachment.php?...1&d=1590027126
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    Last edited by jackie schmidt; 05-20-2020 at 10:17 PM.

  2. #2
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    So that Ingersoll Rand drill comes with a tapped reverse-thread hole in the top?

  3. #3
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    Quote Originally Posted by alinwa View Post
    So that Ingersoll Rand drill comes with a tapped reverse-thread hole in the top?
    You noticed that, huh.

    Yes, the thread in top of the drill is a left hand thread. I made the end of that 3/4 feed rod to fit it. The pillow block bearing has a threaded insert pressed into to do the actual feed while drilling..

    These are relative small holes. I will be doing one next week, a 3600 HP tug, that has 1 1/2 inch bolts. I use a #4 air drill to do those.

  4. #4
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    Fantastic.

    You look younger every day.

    Good On Ya

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    Quote Originally Posted by alinwa View Post
    Fantastic.

    You look younger every day.

    Good On Ya
    Al. Those two men helping me, you could add their ages together and I still top them by about 20 years.

    I donít know if climbing around in these darned boats has kept me young, or made me old

  6. #6
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    Quote Originally Posted by jackie schmidt View Post
    Al. Those two men helping me, you could add their ages together and I still top them by about 20 years.

    I donít know if climbing around in these darned boats has kept me young, or made me old
    I do concrete and it's traditional for concrete guys to whine endlessly about "how hard this is on their bodies" and to make jokes every time they see an old guy gimping along "there goes an old concrete finisher"......... and every single guy I've known who's "got out and moved up to a civilized job" ends up buying a gym membership .....

    and still whining

    About getting fat....

    I'm not blowing smoke up yer butt, I believe in activity and attitude.

    And I hope to look and feel that good in the fleeting second it'll take me to catch up to you

    You love your work

    And it shows

  7. #7
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    Always like your work photos and glad that you posted it on the Practical Machinist forum also. Real life machine work.

  8. #8
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    Quote Originally Posted by Butch Lambert View Post
    Always like your work photos and glad that you posted it on the Practical Machinist forum also. Real life machine work.
    its unbelieveable the knowledge you have gained keep it up

  9. #9
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    Wink

    I like the 'melted earth' magnets on that magnetic drill

  10. #10
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    Quote Originally Posted by rardoin View Post
    i like the 'melted earth' magnets on that magnetic drill
    lol

  11. #11
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    Thumbs up Thank you Jackie

    Jackie, I never tire of viewing your work. Thanks for taking the time to share it with the rest of us.
    As my father was sometimes heard to say, "It takes quite a hoss to do that kind of work."

    Best regards Hoss !

    Gene Beggs

  12. #12
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    Engine

    Thanks Jackie, the engine looks to be a Cummins QSK 50. Do you know?
    Larry

  13. #13
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    Quote Originally Posted by llboers View Post
    Thanks Jackie, the engine looks to be a Cummins QSK 50. Do you know?
    Larry
    Close. It is a QSK 38, tier 4. I think they are set at 1300 HP. That is about max for a 38 series.

    Surprisingly, we donít see that many KT 50 series. When boats start getting into the1500+ HP per side, most are opting for the 35-16 Cat series.
    Last edited by jackie schmidt; 05-23-2020 at 07:18 AM.

  14. #14
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    Chockfast, Jackie

    Jackie I'd like to try some Chockfast in several applications.

    I know absolutely nothing about it, had only heard of it once before you mentioned it and have been reading the tds from the company and am fascinated..... thermal expansion coefficient very near steel.....

    My question is, how do you mix it?

    My concern or question concerns 'air entrainment' ie bubbles in the mix. (This is a big problem with liquid epoxies, one which I'm pretty familiar with)

    So, in simple terms.... how do you mix it and are bubbles a factor?

  15. #15
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    Quote Originally Posted by alinwa View Post
    Jackie I'd like to try some Chockfast in several applications.

    I know absolutely nothing about it, had only heard of it once before you mentioned it and have been reading the tds from the company and am fascinated..... thermal expansion coefficient very near steel.....

    My question is, how do you mix it?

    My concern or question concerns 'air entrainment' ie bubbles in the mix. (This is a big problem with liquid epoxies, one which I'm pretty familiar with)

    So, in simple terms.... how do you mix it and are bubbles a factor?
    Chockfast comes in many grades.

    https://itwperformancepolymers.com/products/chockfast

    For chicks under reduction gears and engines in boats, Chockfast Orange is used.

    Gray is used in chocking in Deck Machinery, support under tracks, support under steel machinery beds.

    What are you going to use it for? That determines which grade you use.

    As for bibles, I have seen old chocks broken up, and they look solid. Much depends on how you mix the hardener. The. Product comes in 1 gallon cans. There will be a small bottle of activator. The amount of activator you use is determined by the temperature.

    It is not recommended to pour Chockfast under 50 degrees. In engine rooms of boats, if in winter and cold, it is advised to use heaters to get the temperature in the engine room above 70 degrees.

    To use, you mix in the proper amount of activator, and pour.

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