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That sample photo appears to be trim-moulding-like PVC. If so, it was probably extruded to that profile, or the manufacturer produces so much that they have a custom cutting head for that shape.
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Definitely not a standard profile. Most router and shaper bits are fatter close to the shaft and thin out further on the radius. Three pass or more, maybe with a plunge cove bit (can't have shaft in the middle), and then a bevel to get the middle part, and a round-over to finish the edge.
Or a table saw shaper blade kit with multiple passes and different bits.
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MikeF wrote:
Definitely not a standard profile. Most router and shaper bits are fatter close to the shaft and thin out further on the radius. Three pass or more, maybe with a plunge cove bit (can't have shaft in the middle), and then a bevel to get the middle part, and a round-over to finish the edge.
Or a table saw shaper blade kit with multiple passes and different bits.
Manufacturer may have used a wood moulder, 2-axis cutting with shafts at 90 degrees to each other.