I stumbled around the Internet and used tool stores in the Bay Area unable to find a grooving plane that met my needs and my budget. About two weeks ago I got the idea to grind out the middle of a block plane blade and create a two-fanged grooving plane. The result is below, and it works
The design is a basic Krenov-style lamination with the bottom shaped to match the plane blade's "teeth". I made two "teeth" thinking I'd always be able to plane with the grain, but this was an unnecessary feature: tear out is minimal when cutting a groove against the grain. I think I'll grind one of the teeth down to 1/8" for smaller grooves, but for now I'm just looking forward to using my new tool.
One last thing, chip clearance is flawless. No need for a side escapement cut.
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Location:22nd St,San Francisco,United States