This nine-piece Koyama kanna joinery plane set brings together the planes needed for joinery and curved shaping in one collection, housed in its own wooden box. Rather than a general bench kit, it is built around the tasks that come up in chairmaking, boat and instrument building and other work involving sculpted or curved components alongside standard joints.
Two Ko Hina Kanna smoothing planes (42 x 150mm and 42 x 180mm, flat sole) cover final surface finishing on flat boards, the shorter for small components and the longer for wider panels. The Kiwa Kanna shoulder plane (31mm) trims into corners that a smoothing plane cannot reach, cleaning up tenon shoulders and stopped housings. Two Kushigata Kanna rebate planes (18mm and 21mm) cut and clean rebates and trim tenon cheeks across a range of joint sizes.
For curved work, the set includes a Soridai Kanna and a Shi-Ho-Sori compass plane (both 24mm), covering convex and tighter or reverse curves respectively. The Sotomaru hollowing plane (18mm) shapes concave surfaces such as scooped seats, while the Uchimaru rounding plane (18mm) rounds over convex edges and curved components.
| Plane | Blade width | Body length | Used for |
|---|---|---|---|
| Ko Hina Kanna Smoothing Plane (Flat) | 42mm | 150mm | Finishing small flat components |
| Ko Hina Kanna Smoothing Plane (Flat) | 42mm | 180mm | Finishing wider flat panels |
| Kiwa Kanna Shoulder Plane | 31mm | 182mm | Trimming tenon shoulders and stopped joint faces |
| Kushigata Kanna Rebate Plane | 18mm | 180mm | Cutting and cleaning narrow rebates |
| Kushigata Kanna Rebate Plane | 21mm | 180mm | Cutting and cleaning wider rebates, trimming tenon cheeks |
| Soridai Kanna Compass Plane | 24mm | 120mm | Convex curved surfaces |
| Shi-Ho-Sori Compass Plane | 24mm | 122mm | Tighter and reverse curves |
| Sotomaru Hollowing Plane | 18mm | 143mm | Hollowing concave surfaces |
| Uchimaru Rounding Plane | 18mm | 143mm | Rounding over convex edges and curved components |
As with all kanna, these planes require setup before first use: fettling the sole, adjusting the blade and chip breaker, and tapping the blade into position. This is an excellent series of videos by Sumokun that explains the process of setting up a Kanna in English (watch the first video, then the third, then the second).