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The photo is a square slice through a 6 x 6 post which has this shaping done each corner. I am replacing the post and want to reproduce this. I need a bit because the routed part of the edge is about 10 foot long.

Existing edge

I've been hitting the local stores etc, and the nearest we can find is a beading bit - but those have square flats and a basic bead/roundover - where as mine seems to be two coves with a 90 degree bead. I've also checked the entire range of Diablo profiles online.

I can't believe this was a custom bit, as it was done in the backyard by the people who erected the arbor as part of landscaping the yard - and I doubt they shelled out for that.

If I can get the "class" of bit (e.g. bead, roundover) defined, I can then work out the size I need.

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  • I can almost guarantee that is was 1 or more molding planes.
    – bowlturner ♦
    Aug 16, 2022 at 19:29
  • Similar to (same as?) the last time we had a similar query, this could be done with creative use of multiple bits and multiple passes. And the original could have been done this way. "I can't believe this was a custom bit... I doubt they shelled out for that." But maybe it IS a custom bit, but they used it enough (e.g. this profile was one of their USPs) that the cost did make economic sense. I have no idea what the price range was for custom router bits back in the day, but I bet it was more reasonable than one might expect, particularly for solid HSS which is viable for work in softwoods.
    – Graphus
    Aug 16, 2022 at 21:03
  • Sorry didn't have room to include this, the custom bit could easily have been for a spindle moulder rather than any size of hand-held router. The need for custom spindle-moulder knives was apparently so commonplace that manufacturers all offered custom-profile services.
    – Graphus
    Aug 16, 2022 at 21:07
  • Yeah, I'm also coming to the conclusion that this was multiple bits. It was done 20 years ago. But the wood that was shaped is a 6x6 x 16ft beam, and I can't see that being loaded onto a jobsite router table (for example). I can see two 1/4" coves to get the shoulders, leaving an interior 90 degree corner that would be rounded over. But I've never used a router so am not sure if that's practical.
    – kdopen
    Aug 16, 2022 at 21:48

1 Answer 1

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Y’all are going to plotz when I tell you this.

Roman ogee. Twice.

enter image description here

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    Yes! Rotating images from router sellers and overlaying profile looks like match. I thought roller bearing would prevent second cut but bearing surface unaffected by first cut. Maybe good idea to saw of corner at start to reduce load on bit.
    – Volfram K
    Aug 17, 2022 at 9:27
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    @kdopen, you may be aware of this already but in case not, there is a wide variety in ogee bits. Not just in size and shaft diameter, but also in how 'long' the ogee is so if you need a dead-on match you'll have to buy with care.
    – Graphus
    Aug 17, 2022 at 19:48
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    Meant to say yesterday, +100 innernets points for drawing skilz :-D
    – Graphus
    Aug 18, 2022 at 0:02
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    +1 for the proper use of "plotz". The rest of the answer is just bonus material! :D
    – FreeMan
    Aug 18, 2022 at 14:46
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    Think we got there - the trick was to fit a larger OD bearing. Thanks all
    – kdopen
    Aug 18, 2022 at 20:14

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