any idea how to create this concave depression

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Forum topic by rizzo posted 10-31-2016 01:12 AM 3829 views 1 time favorited 25 replies Add to Favorites Watch
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76 posts in 1737 days

10-31-2016 01:12 AM

Topic tags/keywords: how to concave router technique

It seems so perfect that there is no way it was hand carved.. I saw this and I can’t figure out how i would do it. Any guesses on how this might be done. I just think it is really cool.

25 replies so far

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5157 posts in 3614 days

#1 posted 10-31-2016 01:34 AM

A small power grinder could work for this…

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#2 posted 10-31-2016 05:34 AM

Looks like a spokeshave.

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#3 posted 10-31-2016 09:18 AM

my guess would be a drill press with a special bit

-- You never cut a piece to short, you are just prepping that piece for a future project

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997 posts in 3568 days

#4 posted 10-31-2016 09:54 AM

It’s made by these guys in L.A.
From what I can tell, it’s at least started with an angle grinder. Probably scrapers and sanders after that.
Ive seen some of their products personally….very nice….very expensive.
This is a retailer in Calgary here.(only one in Canada)

All that said, I’ve made about a dozen of them. A router and a template works fine with a lot of scraping and sanding afterwards. CNC worked better, especially for the round bottom….still a fair amount of sanding involved.

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#5 posted 10-31-2016 02:24 PM

my guess would be a drill press with a special bit

- Mikesawdust

Yes, “convex drill bits”. I’ve never used one, and I’ve only ever seen them in pictures. Plus they look like they would be ungodly expensive.

Perhaps a really large spade bit could be re-ground to make this shape.

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#6 posted 10-31-2016 02:32 PM

bowl bit ???

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Greg the Cajun Wood Artist

482 posts in 1427 days

#7 posted 10-31-2016 02:32 PM

A core box router bit will do it…but the largest diameter I have seen is 2”

-- Wood for projects is like a good Fart..."better when you cut it yourself"

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2859 posts in 1384 days

#8 posted 10-31-2016 02:53 PM

Probably done with a rosette cutter.
It would be pretty easy to have a knife cut for one of these,
if you were going to do enough of them to make it worth it.

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10477 posts in 4133 days

#9 posted 10-31-2016 03:18 PM

Lotta sanding. You can get curved rubber sanding
“drills” you would glue sandpaper to.

In terms of the carving, die grinders, etc… skill.

The dish could be roughed out then the sides
defined with a large core box bit and a template.
I would use an overarm router and I suspect that’s
what they used for all the carving, using a template
made to follow the edge and a big coving bit.

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Jack Lewis

483 posts in 1563 days

#10 posted 10-31-2016 03:21 PM

That was offset mounted on a large lathe. Betcha!

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264 posts in 1916 days

#11 posted 10-31-2016 05:34 PM

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1866 posts in 2801 days

#12 posted 11-01-2016 02:06 PM

I think it’s possible to make a router jig that tilts in two directions and cuts that shape.

Jack Lewis could be right about the offset mount but it would require a massive lathe or one that has very slow RPM.

If I had to make just one and needed it perfect, I’d cut most of the scoop with a die grinder then sand it smooth with a half-sphere sanding block creating on the lathe.

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4592 posts in 4227 days

#13 posted 11-01-2016 02:26 PM

The company likely just sets up a CNC and says give me a depression 4 inches across and 1.7 inches deep..then just hit ‘Enter’

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1316 posts in 1393 days

#14 posted 11-01-2016 03:45 PM

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76 posts in 1737 days

#15 posted 11-01-2016 04:04 PM

Thanks so much everyone! lots of great ideas and things to try! I really appreciate it. I also came across this video, which seems like a pretty cool method / too-build.

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