Prop finish on Acme 422

[pitts12driver]

I just received a 422 I ordered as a spare. I was pretty surprised at the surface finish - it clearly came straight off the CNC mill with no post processing. There are significant milling marks with ridges/troughs and sharp burrs on the leading/trailing edges. Is this the way they all come??

thx...

[jasper]

That's the way they come. It runs great on my boat.

[east tx skier]

I've bought two new Acme props and mine both had a few hand finish touch up marks, which is not uncommon. Edges were sharp, but no burrs. If it were me, I'd call Bill Weeks at Acme and ask him if they intended to let something like that out the door.

Bottom line. If he isn't concerned and it runs fine, I wouldn't worry about it.

[Flipside]

There are usually grind marks on the blades as this is how they balance the prop. But burrs on the leading and/or trailing edges is unusual. I'd investigate this. I've been through a lot of props this past season and the edges have always been clean (and sharp) with no burrs.

[DanielC]

That is the way they come. The edges are very sharp. Handle them carefully.
If I were you, I would get a pair of leather gloves, and a file, and remove the burrs from the edges. Do not bevel the edges, just remove the burrs.

[Mikeski]

I always do a little sharpening and sanding on my new props just to help them be as efficient and smooth running as they can be. File from the backside, take a minimum amount of material from the backside edge and do it evenly on all the blades so you don't lose the balance. Deburr the edges with 220 emery cloth after the sharpening. You might be surprised how smoothly your new prop spins under you boat.