Question about making a set of Hollows and Rounds

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Forum topic by Holt posted 02-25-2016 11:13 PM 653 views 0 times favorited 2 replies Add to Favorites Watch
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238 posts in 2594 days

02-25-2016 11:13 PM

Read the article in the latest issue of Popular Woodworking about building the Roubo Hollow and Round planes. I would love to have at least a partial set, but would like to get the touchy part done without having to rely on my hand tool skills.

Seems like it should be possible to construct the bed of a Round using a round-over bit in a router table. Then either use that plane to construct the bed for the hollow (I know that part will work) or use a complimentary round grove bit in the router table.

Am I missing something with this idea?

I found a source to order specific Hollow and Round blades, already shaped and sharpened starting at about $50 a pair, not a huge difference from buying a pair of blanks from LN.

Here is info on the irons

#4 – 1/4” (6.35 mm) $57.62 G50.000.04 #6 – 3/8” (9.52 mm) $64.34 G50.000.06 #8 – ½” (12.70 mm) $71.12 G50.000.08 #10 – 5/8” (15.80 mm) $77.74 G50.000.10 #12 – 3/4” (19.00 mm) $84.69 G50.000.12 #13 – 7/8” (22.20 mm) $91.47 G50.000.13 #15 – 1-1/8” (28.50 mm) $98.25 G50.000.15 #17 – 1-3/8” (34.90 mm) $105.03 G50.000.17

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2 replies so far

View David Taylor's profile

David Taylor

326 posts in 1052 days

#1 posted 02-25-2016 11:55 PM

I would think that would work. The blade/bed of a hollow or round transcribes 1/6 of a circle. A round-over bit transcribes 1/4 of a circle. Math says they are the same curve.

-- Learn Relentlessly

View James Wright's profile

James Wright

331 posts in 828 days

#2 posted 02-27-2016 10:07 PM

That could work you just have to make sure the round over Bit is the correct radius.
The one thing to be careful of is a round or hollow is only 60 degrees of a curve not 180 or 90 degrees.

The traditional way is to make the round with a plane shaping the rounded edge just as if you were rounding over the edge of a board. then when that is in place using that to make the hollow.

-- James Wright, Rockford IL,

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