Genmitsu MC40A — 1.0mm Flat Upcut (Micro)
Genmitsu
Overview
Ultra-fine 1.0mm flat upcut end mill for micro-detail CNC work. Shank: 1/8in (3.175mm). Cutting dia: 1.0mm. Flutes: 2. Max RPM: 30,000. Extremely delicate - requires low DOC and feed rate. Not for beginners.
Properties
Difficulty
expert
Pros
- Fine detail in tight geometry
- PCB isolation routing
- Inside corners smaller than 3.175mm
- Included in MC40A set (spend these before buying dedicated micro bits)
Cons
- Snaps instantly with wrong settings
- Max 0.1mm DOC — any more and it breaks
- Slow — max 200–250mm/min
- No plunge cuts — always ramp in
- Not for production use
Best For
- PCB engraving (FR4 board)
- fine text engraving in hardwood
- intricate inlay patterns
- micro-detail relief carving
- jewelry in soft metals
Avoid For
- Softwoods with loose grain (fibers catch micro bit)
- depths over 0.5mm without multiple passes
- aggressive plunging
- machines with high runout
Storage
Dry storage. Keep protected — even setting them down wrong breaks the tip.
Brands
Genmitsu (SainSmart)