Genmitsu MC40A 1/8in Shank CNC Router Bit Set, 40pcs

Genmitsu MC40A is a 40-piece CNC cutter, milling, and carving bit set for desktop CNC routers that use 1/8in / 3.175mm shank tools. The set combines 2-flute spiral flat nose bits, 2-flute ball nose bits, nano blue coated end mills, and titanium coated end mills for general cutting, engraving, profiling, and detail work.

The mixed cutter selection gives users a practical starter and replacement kit for wood, plastic, acrylic, PCB material, aluminum, and other compatible materials when feeds, speeds, chip evacuation, and machine rigidity are set correctly. With 40 cutters in one set, MC40A is useful for switching between roughing, finishing, detail carving, and contour operations without relying on only one cutter style.

For related CNC tooling, compare the Genmitsu MC10A 1/4in Router Bit Set, Genmitsu SN07A Aluminum End Mill Set, and MRBC08 CNC Router Bits.

Technical Specifications

Integration Notes & Hardware Guidance

• Collet fit: Use a clean 1/8in / 3.175mm collet and check tool runout before cutting, especially with smaller-diameter cutters.
• Choose the cutter type: Use flat nose bits for slotting and flat-bottom work, ball nose bits for rounded contours, and coated end mills for finer diameter options.
• Tune feeds and speeds: Start conservatively and adjust depth of cut, feed rate, and spindle speed according to chip quality, finish, machine rigidity, and material hardness.
• Control chips and heat: Use suitable dust extraction, air assist, lubricant, or cooling based on the work material and cutter type.
• Secure the stock: Confirm workholding and toolpath clearance before machining to avoid cutter breakage, chatter, or fixture contact.

For compatible setup items, see the ER11 Spring Collet Set and Genmitsu 3018-PROVer CNC Router Kit.

Packing List

FAQ

Q: What shank size does MC40A use?
A: The MC40A set uses a 1/8in / 3.175mm shank.

Q: How many bits are included?
A: The set includes 40 CNC cutter, milling, and carving bits.

Q: What cutter types are included?
A: It includes spiral flat nose end mills, spiral ball nose end mills, nano blue coated end mills, and titanium coated end mills.

Q: What cutting diameters are included?
A: The coated end mill groups include 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, 2.2mm, 2.5mm, and 3.0mm diameters, plus 3.175mm flat nose and ball nose cutters.

Q: Can these bits cut aluminum?
A: They can be used for aluminum when the machine, collet, feed rate, spindle speed, chip evacuation, and depth of cut are appropriate. Start conservatively and test on scrap material.

Q: Which collet should I use?
A: Use a 1/8in / 3.175mm collet that matches the tool shank and inspect the collet for cleanliness and wear before tightening.

Q: Is MC40A better for general use than a single-bit pack?
A: Yes, the mixed 40-piece selection provides more cutter shapes and diameters for different CNC routing, carving, and finishing tasks.