View Full Version : Is this right for a CNC prop?

05-17-2006, 08:53 PM
Hey all,
I'm investigating a 'vibration' in our '04 205V (new...very low hours). It only occurs above 30mph and is more of a pulsating vibration than a consistant vibration.

Anyways...I was inspecting the prop (CNC) and noticed that it looks as if the backside has been 'massaged'. I'm not sure if they tune them at the manufacturer??? The opposite face of the blades have the heavier machined CNC marks as does one of the backsides of the blades. However, the other 3 blades have at least some portion a 'massaged' look to them where the CNC machine grooving in much less noticeable (smooth).

Take a look at the picture and let me know if this is normal of a new prop.

Thanks for your help as I try to move down the checklist.

05-17-2006, 09:58 PM
I just bought a new 3-blade Acme prop and the back side of one of the blades has a large smooth spot. Acme confirmed that the mark is from balancing the prop after its machined.

05-17-2006, 10:18 PM
That right blade at 4 oclock looks funny. Almost like it's got a little to much cup on it.

east tx skier
05-17-2006, 10:43 PM
The small hand finish marks are common in CNC'd props. The vibration is not (in my experience).