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View Poll Results: New or Refurb?
New 4 100.00%
Refurb 0 0%
Voters: 4. You may not vote on this poll

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Old     (h20mobius)      Join Date: Jul 2012       05-04-2013, 4:45 PM Reply   
Just received my new, CNC'd OJ prop today, but I was surprised to see two blades were perfectly machined, and two others we "ground and polished." Tried calling OJ, but they are closed until Monday. Has anyone else seen this on a "NEW" prop? I thought the purpose of milling them was to keep within a 1/1000th tolerance? If that's the case, why are they having to grind them post-CNC?

Machined Blade

Ground Blade

Can't seem to get the image to embed, so here is a link

Last edited by h20mobius; 05-04-2013 at 4:51 PM. Reason: Image isn't embedding
Old     (dezul)      Join Date: Jul 2012       05-04-2013, 4:49 PM Reply   
Oj prop is local to me. I bought a new prop at the beginning of spring. It was mostly cnc'd with some grinding. I am not sure why it matters. As long as it is balanced then it should work as intended. Cosmetics of the blades dont mean much. They will tarnish shortly anyways.
Old     (dezul)      Join Date: Jul 2012       05-04-2013, 4:54 PM Reply   

Mine cnc on the front with grind on the back. Not a lot of grind but some.
Old     (chpthril)      Join Date: Oct 2007       05-04-2013, 5:36 PM Reply   
Ive seen this a handful of times. Its not uncommon for some grinding to be done in order to balance the props after machining.
Old     (CTXxRoss)      Join Date: Apr 2013       05-04-2013, 5:36 PM Reply   
stuff can warp during heavy machining... I have been doing machine work for around 6 years now. I wouldn't worry to much about it man, grinding is not uncommon in a machine shop and they may have done it to get it back into tolerance. 1/1000th is a tight tolerance and one tiny mistake can throw it off.
Old     (wakebrdjay)      Join Date: Apr 2008       05-04-2013, 5:43 PM Reply   
I bought a new Acme prop from a shop,it's also ground.I contacted Acme to ask if this was normal for a new prop and they said it was.
Old     (boardman74)      Join Date: Jul 2012       05-04-2013, 6:09 PM Reply   
TigeMike hit it on the head. I have also been told it's part of the truing/ balancing process post CNC.
Old     (h20mobius)      Join Date: Jul 2012       05-04-2013, 7:58 PM Reply   
Gotcha.. That makes sense. Thanks for the replies.


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