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Thread: CNC??????

  1. #1
    Join Date
    Apr 2007
    Location
    Las Vegas, Nevada
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    1,582

    Default CNC??????

    I thought that CNC means smooth cuts, slim lines, quality work. I am ready to pull my prop, after this weekends trip and this is what I saw. Please tell me that this in not normal. I already ordered a new prop form Acme Props. Not to happy with this workmanship of OJ.



  2. #2
    Join Date
    Aug 2006
    Location
    Salt Lake City
    Posts
    2,291

    Default

    I just put an OJ XMP on my Outback and it looked just like that. We operate a CNC facility that works with wood, and acrylic so it is hard to compare... I did not perceive it as a quality issue....just looked different than what came on mine originally from OJ and who knows, it may smooth out after hours of use (had 125 hrs prior to stump)
    Brad

    2011 Launch 21V Sold... boatless replaced with a Jeep JKUR
    2006 Moomba Mobius LSV sold
    2004 Outback sold

  3. #3
    Join Date
    Aug 2004
    Location
    Lake Hickory, North Carolina
    Posts
    1,390

    Default

    Ah, CNC, aka Computerized Numerical Control. I'm afraid it won't smooth out over time, It just means the blades of the prop weren't cast in a mold, but were machine cut. The perceived advantage is the blades are more uniform on the cnc one.
    .
    hope this helps
    .
    B

  4. #4
    Join Date
    Apr 2007
    Location
    Las Vegas, Nevada
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    Default

    I was told that the OJ props were CNC When I pulled the one I bent, it did not look CNC to me. I have seen some CNC props and they do not look anything like this one. Well no worries, I already ordered my new prop. It should be here by the end of the week.

  5. #5
    Join Date
    Oct 2005
    Location
    Central FL
    Posts
    791

    Default

    All CNC props will look similar to that.

    Both Acme and OJ make Cast props and CNC props - all the higher end models are CNC. The process makes a better ballanced, and more consistent prop. The minor surface marks from the milling look bad, but in the water they do very little, especially near the hub where you are poinging the camera. At the tips of the blades everything is smooth. The scuff marks you see are from a manual grinder that they use to smooth out any minor imperfections and also ballance the blades.

    Find something else to worry about.



    -Joe

  6. #6
    Join Date
    Jan 2003
    Location
    Minnesota and Wisconsin
    Posts
    1,197

    Default

    I have an Acme 3 blade and the blade surfaces look pretty much the same. Not sure about the hub, but balance is the key. I am no expert, but I would be surprised if some irregularity around the hub would be an issue. But you should have a spare anyhow....
    If you believe something to be true, it will be - in it's consequences.

    2009 MasterCraft ProStar 197 - DD - 5.7L - 325HP - Zero Off

  7. #7
    Join Date
    Apr 2007
    Location
    Las Vegas, Nevada
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    Default

    I will be getting the old one fixed. The new Acme will be on the boat and the OJ will be in the bag for backup. I still need to purchase a prop puller. I found it at WestMarine.com. for about $70.00.

  8. #8
    Join Date
    Mar 2003
    Location
    Springfield Missouri
    Posts
    3,391

    Default

    I've had excellent success with the Cutter prop.

    http://www.cuttermarine.com/products.html

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