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Mold lines on a beehive oil filter?

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The tried-and-true method that works best for me when removing mold lines from finely-ribbed parts is to fold a sharp crease in a piece of 400 or 600 grit sandpaper, and use it as a sharp two-sided file to remove the offending seam, perpendicular to it, one groove at a time. Depending on how good your eyes are, you may have to work under magnification.

If it's a chromed part, you'll have to refinish it anyway, and the fineness of the grit will leave scratches that are easily filled with one coat of primer, but it's still sharp enough to cut quickly.

You may also have to repeatedly fold the paper in several new locations, as the grit wears off of the edge quite rapidly.

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Erik's made an excellent point! Most, if not all of those "classic" beehive oil filters were cast aluminum--back in the day when scrap aircraft aluminum was extremely plentiful (from almost half a million airplanes being cut up and melted down after WW-II). Many items, such as the beehive oil filter he shows, were diecast, meaning that the mold used was very much the same style of mold used to make the model car part--just 25X larger and made for accepting molten aluminum alloy instead of styrene plastic. That would make for the mold parting line seen on the one Erik's shared here.

About the only way such a cast aluminum part could be made without any mold parting line would have been to sand-cast it, which of course would have meant a lot of polishing and finishing of the raw castings. Of course, CNC machining didn't exist "back in the day", but that would have resulted in nary a mold parting line.

My thinking here? I'd leave the mold parting line on the kit oil filter, because chances are any vintage cast aluminum accessory such as this would have a mold line or two on it.


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So since the real thing was a cast piece and not machined, it should have a seam line.

BTW... why a "beehive" filter? They don't look anything like a bee hive... :blink:

Not a man-made one. But it does look a bit like the sort of hive bees would make inthe wild. The sort that frequently drops on the protagonists head in cartoons.

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