| name | sharpen-knife |
| locale | wenyan |
| source_locale | en |
| source_commit | 82c77053 |
| translator | Julius Brussee homage โ caveman |
| translation_date | 2026-05-03 |
| description | Sharpen and maintain knives using whetstones, field stones, and improvised abrasives. Covers blade anatomy, bevel assessment, whetstone technique (coarse to fine progression), stropping, sharpness testing, field sharpening methods, and ongoing edge maintenance. Use when a knife fails the fingernail test, when cutting tasks require excessive pressure, before a trip where a sharp blade is essential, after heavy use, or when a blade has visible nicks or a rolled edge. Applicable to bushcraft blades, folding knives, and garden cutting tools.
|
| license | MIT |
| allowed-tools | Read |
| metadata | {"author":"Philipp Thoss","version":"1.0","domain":"bushcraft","complexity":"intermediate","language":"natural","tags":"bushcraft, knife, sharpening, blade, maintenance, whetstone, tools, gardening"} |
็คชๅ
ไปฅ็คช็ณใ้็ณใๆฌ่จญไน็ฃจ็ฉ๏ผ็คชๅ่้คๅ
ถ้ใ
็จๆ
- ๅ่ผ่งธๆ็ฒไธๅฌไน็จ
- ๅๅ้ ้ๅ๏ผๆท่ไธ้ฝไน็จ
- ๅฐ่ก่้ๅฉๅ๏ผ้ใ็นใๅ๏ผไนๅไน็จ
- ้็จไนๅพไพ็ถญ๏ผไพ็จ๏ผๆฏไธ่ณไธๆฅ็บ็ฏ๏ผไน็จ
- ๅ่ฆ็ผบใๆฒใๅดฉไน็จ
ๅ
ฅ
- ๅฟ
่ฆ๏ผๅฐ็คชไนๅ
- ๅฟ
่ฆ๏ผ็ฃจ้ข๏ผ็คช็ณใ้ๅๆฟใ็ทๆฃใ้็ณ๏ผ
- ๅฏ้ธ๏ผ็ฃจ้ฉ๏ผ็ฎๅธถใ็ดๆฟใๆปๆจ๏ผไธฆ็ฃจ่
- ๅฏ้ธ๏ผ่ง่ฆๆ็กฌๅนฃไปฅ็บๆ้ขไนๅ
- ๅฏ้ธ๏ผๆฒน็ญไปฅๅฏๆ้ข
- ๅฏ้ธ๏ผ็ฃจๆฒนๆๆฐด๏ผไพ็ณไน้ก๏ผ
ๆณ
็ฌฌไธๆญฅ๏ผๅฏๅ
ๅฏๅไปฅๅฎ็คชไนๆทฑๆทบใ
Blade Assessment:
โโโโโโโโโโโโโโโโโโโโโโโฌโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโฌโโโโโโโโโโโโโโโโโโโโโโ
โ Condition โ Signs โ Action Needed โ
โโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโค
โ Dull (most common) โ Won't catch on fingernail; โ Medium grit โ fine โ
โ โ slides off tomato skin; โ grit โ strop โ
โ โ reflects light along edge โ โ
โโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโค
โ Very dull / abused โ Visible flat spot along edge; โ Coarse grit โ โ
โ โ tears rather than cuts; โ medium โ fine โ โ
โ โ edge shines under light โ strop โ
โโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโค
โ Nicked / chipped โ Visible notches in edge; โ Coarse grit to โ
โ โ snags on material when drawing โ grind past nicks โ โ
โ โ across โ reprofile โ strop โ
โโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโค
โ Slightly dull โ Catches on fingernail but not โ Strop only (or a โ
โ (maintenance) โ crisply; still cuts paper but โ few passes on fine โ
โ โ not cleanly โ grit then strop) โ
โโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโค
โ Rolled edge โ Edge feels sharp on one side โ Strop firmly on โ
โ โ but dull on the other; blade โ both sides; if that โ
โ โ curves microscopically โ fails, light passes โ
โ โ โ on fine stone โ
โโโโโโโโโโโโโโโโโโโโโโโดโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโดโโโโโโโโโโโโโโโโโโโโโโ
Light Test:
Hold the blade edge-on under a bright light. A sharp edge is invisible โ
it has no width. A dull edge reflects a thin line of light where metal
has folded or flattened.
ๅพ๏ผๅไน็ๅทฒๆ๏ผๆ้ ไน็คช็ฒ็ดฐไบฆๅฎใ
ๆๅ๏ผ่ฅไธ่ฝๅฎ๏ผ่ชไธญ็ฒ๏ผไธๅ็ฎ๏ผๅงใๅพๅฏ็ดฐไน๏ผ็ถๅๅคช็ฒๅ็ฃจ่็ก่ฌไน้ใ
็ฌฌไบๆญฅ๏ผ่ญ็ฃจ็ฉ
ๆๆๅฎไน็ณใ
Abrasive Types:
โโโโโโโโโโโโโโโโโโโโโโโฌโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโฌโโโโโโโโโโโโโโโโโโโโโโโ
โ Type โ Characteristics โ Best For โ
โโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโโค
โ Water stones โ Soak 5-15 min before use; โ Home sharpening; โ
โ (natural/synthetic) โ fast cutting; wear quickly; โ best feedback and โ
โ โ need flattening periodically โ finest edges โ
โโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโโค
โ Diamond plates โ No soaking needed (use water โ Field use; hard โ
โ โ as lubricant); very durable; โ steels; flattening โ
โ โ aggressive cut โ water stones โ
โโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโโค
โ Ceramic stones/rods โ No soaking; very fine grit; โ Touch-up and โ
โ โ hard and slow-wearing โ maintenance; field โ
โ โ โ carry โ
โโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโโค
โ Oil stones โ Use honing oil; slower cutting; โ Traditional; โ
โ (Arkansas, India) โ very durable; less messy โ workshop use โ
โโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโโค
โ Field stones โ Any smooth, fine-grained stone; โ Wilderness emergency โ
โ (improvised) โ river stones, slate, sandstone; โ when no other โ
โ โ unpredictable grit โ abrasive available โ
โโโโโโโโโโโโโโโโโโโโโโโดโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโดโโโโโโโโโโโโโโโโโโโโโโโ
Grit Progression:
220-400 โ coarse โ reprofile, remove chips, set new bevel
800-1000 โ medium โ standard sharpening of dull blade
3000-6000 โ fine โ refine edge, polish bevel
8000+ โ ultra-fine โ mirror polish, razors (optional)
ๅพ๏ผ็ฃจ็ฉๅทฒๆ๏ผๅทฒๅ๏ผๆตธใๆฒนใๆฝค๏ผใ
ๆๅ๏ผ่ฅ็กๆญฃ็ณ๏ผ็ทๆฏไนๅบ๏ผ็ก้ไน็ฐ๏ผๅฏๆฌ็บ็ดฐ็ฃจใ่ป็ชไน้ไบฆ็ถใ้ไธญ๏ผๆป็ณๅๆผ็ก็ฉใ
็ฌฌไธๆญฅ๏ผๅฐๆ้ขไน่ง่ๅไน
ๆ้ขไน่งๅฎๅไนๅฝขใ้ค้ๅกๅค๏ผๅฎๅ่่งใ
Common Bevel Angles:
- Bushcraft / fixed blade: 20-25ยฐ per side
- Kitchen knife: 15-20ยฐ
- Japanese kitchen: 10-15ยฐ
- Machete / chopper: 25-30ยฐ
- Folding knife (EDC): 20ยฐ
- Hori-hori / garden blade: 15-20ยฐ
Finding the Angle:
1. Lay blade flat on stone (0ยฐ)
2. Slowly raise spine until bevel sits flush
3. The flush point is the correct angle
4. Marker trick: ink the bevel, take one stroke
- Ink removed from whole bevel = correct
- Ink removed only at edge = too high
- Ink removed only at shoulder = too low
Coin Stack Reference (rough):
- 1 coin under spine โ 12-15ยฐ
- 2 coins โ 17-20ยฐ
- 3 coins โ 22-25ยฐ
ๅพ๏ผๅฏๆๆไธ่ง่ๅ่ๆ้ขใ
ๆๅ๏ผ่ฅๅพๆไธ่ฝๆ่ง๏ผ็จๅฐๅ
ทๆๅคพใ่งไธๆ่
๏ผ็คชๆไนๆๅธธๅ ไนใๅ
่ฉฆๅปๅ๏ผๅๆฝ็ๅใ
็ฌฌๅๆญฅ๏ผ็คชโโ่ช็ฒ่ณ็ดฐ
็ฑๆ้ ๆ็ฒ่
้ฒ่ณๆ็ดฐ่
ใ
Sharpening Technique:
SETUP:
1. Stone on stable, non-slip surface (wet towel underneath)
2. Stone fully saturated (water) or oiled (oil)
3. Position for smooth, controlled strokes
STROKE METHOD (per side):
1. Place blade at correct angle
2. Push edge forward as if slicing thin layer off surface โ
heel to tip in sweeping arc
3. Maintain consistent pressure and angle
4. Light to moderate pressure โ let abrasive work
5. 5-10 strokes per side, then alternate
ALTERNATING:
- 5-10 A โ 5-10 B โ repeat
- Approaching apex: 3 per side, then 1 per side alternating
CHECKING FOR BURR:
- After enough strokes, thin wire edge (burr) forms on opposite side
- Drag thumb ACROSS edge (never along), spine to edge
- Burr catches on side opposite to one being sharpened
- Burr means apex reached โ switch sides
- Both sides burr-and-removed โ next finer grit
PROGRESSION:
Coarse โ burr both sides โ medium
Medium โ burr both sides โ fine
Fine โ light alternating โ strop
ๅพ๏ผ็ต็ณไนๅพ๏ผๅๅฌๆ็ฒๅบ๏ผๅ็ดๆธ
ๆทจ๏ผ็ฃจ้ฉไนๅ็ฅๆปฏๅฏไน๏ผใ
ๆๅ๏ผ่ฅไบๅๆไนไธไธ่ตท่๏ผๅฏ่งโโๆๅคช้ก๏ผ็ฃจๆผๅไธ๏ผ๏ผๆๅคช็ทฉ๏ผ็ฃจๅไนๅนณ๏ผใๅ็จๆฒน็ญไน่กใ่ฅ็ณๅก๏ผ้ๅฑๅฃ
ไน๏ผ๏ผๆด่ไปฅๆ ก็ณๆๅนณๆฟๅนณไนใ
็ฌฌไบๆญฅ๏ผ็ฃจ้ฉๅ
ถๅ
็ฃจ้ฉ้ค้ค่๏ผๆดๅๅฆๅใ
Stropping Protocol:
1. Use leather strop, smooth cardboard, or bare softwood
(palm side of leather belt works in field)
2. Apply stropping compound if available (chromium oxide, fine paste)
3. Lay blade flat at sharpening angle
4. Draw blade SPINE-FIRST (opposite of sharpening โ drag edge backward)
5. Light pressure only โ less than sharpening
6. Alternate sides: 5 โ 3 โ 1 โ 1 โ 1
7. Total: 20-30 strokes alternating
โ ๏ธ CRITICAL: Strop spine-first (pull edge backward).
Pushing edge-first cuts the leather and dulls the blade.
Field Strop Alternatives:
- Smooth side of leather belt (hold taut)
- Cardboard or newspaper laid flat
- Palm of hand (very light, spine-first only)
- Smooth driftwood or flat of dry log
ๅพ๏ผๅๆท่ๆฏ๏ผๅ่ๅฆ้ป่ฉฑ็ฐฟไน็ดๆธ
ๆทจ๏ผ่ช้็ฉฟ็็ช่ใ
ๆๅ๏ผ่ฅๅ่ฆบๅฉ่ๅฌๆปฏ๏ผ้ค่ๅจไธๅดไนใ็ดฐ็ณไธๅไธไบๆไบคๆฟ๏ผๅ็ฃจ้ฉใ่ฅไปไธ้ฝ๏ผๆไธๅด่งๅทฎโโไปฅๆฒน็ญ้ฉ่ๆญฃไนใ
็ฌฌๅ
ญๆญฅ๏ผ่ฉฆๅ
ถ้
ไปฅๆผธ้ฒไน่ฉฆ่กกๅไน่ณชใ
Sharpness Tests (easiest to most demanding):
1. FINGERNAIL TEST (basic):
Light draw across nail at 45ยฐ.
Sharp: catches and digs in
Dull: slides without catching
2. PAPER TEST (good):
Hold printer paper, slice down.
Sharp: clean cut, no tearing
Dull: tears, folds, won't start
3. TOMATO TEST (kitchen standard):
Place ripe tomato on board.
Sharp: blade weight alone starts cut
Dull: needs pressure to break skin
4. ARM HAIR TEST (very sharp):
Light draw across arm hair, no skin touch.
Sharp: hair pops cleanly
Not quite: hair bends or pushes aside
5. HANGING HAIR TEST (razor sharp):
Hold single hair, bring blade to it.
Razor: cuts with minimal pressure
Unnecessary for most bushcraft/garden use.
Sharpness Standards by Use:
- Bushcraft / camp: pass paper test
- Kitchen: pass tomato test
- Carving: pass arm hair test
- Garden (hori-hori): pass paper test
ๅพ๏ผๅ้ๆๅฎไน่ฉฆใ
ๆๅ๏ผ่ฅ้็ฒ่ฉฆ่ๆ็ด่ฉฆ๏ผๅฎๆด็คชๆผ็ดฐ็ณ่ๅค็ฃจ้ฉใ่ฅ็ฒ่ฉฆไบฆๆ๏ผๅไธญ็ฒ๏ผ่ช็ฌฌๅๆญฅ้็คชใ
็ฌฌไธๆญฅ๏ผ้ไธญไน็คช๏ผ็กๆญฃ็ณไนๆณ๏ผ
Field Expedient Sharpening:
RIVER STONES:
1. Find smooth, flat, fine-grained stone (slate, granite, basalt)
2. Wet surface
3. Same technique as Step 4 โ angle, stroke, alternate
4. Won't polish but restores cutting ability
5. Slightly gritty feel preferred โ glassy stones too slow
CERAMIC:
- Bottom of ceramic mug (unglazed ring) = fine hone
- Excellent for camp touch-ups
CAR WINDOW EDGE:
- Edge of car window (rolled down slightly) = fine ceramic
- 5-10 per side for quick touch-up
SANDPAPER ON FLAT:
- Place on flat log or rock, sharpen as on stone
- Works well
LEATHER BELT STROP:
- Always available if wearing belt
- Hold taut, strop spine-first
Minimum Field Kit:
- Small diamond plate (credit-card size) or ceramic rod
- Leather strop strip (10cm ร 3cm, fits in sheath)
Almost no weight; handles all field needs.
ๅพ๏ผๅๅพฉๆผ่ถณ็จไน้๏ผๅฏไปป็ไธญ่ซธๅใ
ๆๅ๏ผ่ฅ็ก็ฃจ็ฉ๏ผ็กฌๆจไนๅนณ้ขๆฉ็ดฐๆฒๆผ็ดไธญๅฏๆฌ็บ็ฒ็ฃจใๅ
ๆฑๅ
ถ็จ๏ผๅพๆฑๅ
ถ็พใ
็ฌฌๅ
ซๆญฅ๏ผๅธธ้คๅ
ถ้
้ฒๅๆผไฟฎใ
Edge Maintenance Habits:
1. Strop before each use โ 10 per side on leather/cardboard
(alone keeps knife sharp for weeks between stones)
2. Cut on wood, not stone, glass, ceramic, or metal
3. Never pry, twist, or use as screwdriver
4. Clean and dry after use โ moisture corrodes, corrosion eats edge
5. Store in sheath, magnetic strip, or guard โ never loose in drawer
6. Carbon steel: oil after cleaning (camellia, mineral)
7. Stainless: less, but still benefits from drying and oiling
Frequency:
- Daily kitchen: strop daily, stone weekly
- Weekend bushcraft: strop before trip, stone monthly
- Occasional garden: strop before use, stone seasonally
- Heavy field: strop daily, stone every 2-3 days
ๅพ๏ผๅธธ้คไนๆณ็ซ๏ผ็คช็ณไน้๏ผๅๆๅฉใ
ๆๅ๏ผ่ฅ้ ป้ ่ช็ฒ่ณ็ดฐไนๅ
จ็คช๏ผๆ้ผๅคช่ป๏ผๆ็กฌๅ๏ผ๏ผๆๅ็บ่ชค็จๆๅท๏ผๅ็กฌ้ขใๅดๆญใ้น่๏ผใ
้ฉ
้ท
- ่งไธๆ๏ผ็คชๆไนๆๅธธ่
ไนใไธญ้ๆ่งๅๅๅ่ไธๅฉใไปฅๆฒน็ญ้ฉ๏ผๅ
ๆ
ขๅพ้ใ
- ๅ้๏ผ้ๅฃไธ้็คชโโๅๆงฝ็ณ่ๅดฉๅใ็ทฉๅ่ถณ็ฃใ
- ่ถ็ฒ็ดฐ๏ผ่ชๅ็พ็ด่ทณๅ
ญๅๅๆทฑ็ด็ถๅจ๏ผ็ดฐ็ณไธ่ฝ้คใๅ็ฒ็ดฐๅฎๆถๅ่
ไน็ดใ
- ไธ่ตท่๏ผๆช่ตท่ๆผๅ
ฉ้ขๅๆช่ณๅๅฐ๏ผๅไธๅฉใ่ไน็ฏ้ป๏ผๅฎ่ไนใ
- ็ฃจ้ฉไนๅๅ๏ผๆจๅๅ
ฅ้ฉๅ้ฉๆท่ๅๆฒใ็ฃจ้ฉๅฟ
่ๅ
๏ผๆฝๅๅพ่ก๏ผใ
- ็ๅฎๆไน่๏ผๅๅผๅฎๆๅๅ
็ฃจๆ้ข๏ผ็ถ่ๅนณไบฆ้ ่ผๆไปฅ้ค่ใๅฟๆผ่ๅนณ่ตทๆใ
- ็จ่ชคไนๆฝค๏ผๆฐด็ณ็จๆฐด๏ผๆฒน็ณ็จๆฒนใๆททๅๅกใๅฟๆฐดๆผๆฒน็ณใๆฒนๆผๆฐด็ณใ
ๅ
make-fire โ ็คชๅ็บ็ๅผ็ซใๆด่ชใ็พฝๆดๆๅฟ
้๏ผ็ซๆณ่ๅ้ค็ธไผดforage-plants โ ๅฉๅๅฏๆธ
ๆก่ๅฐๅท่ๆจmaintain-hand-tools โ ๅๅ๏ผhori-horiใไฟฎๆๅช๏ผ็คชๆณ็ธ้๏ผๆญคๆๆทฑๆผๅไนๅฐๆณ
