Double-edged CNC Milling Cutters Straight Groove

Need one cutter that trims multi-layer board, splint, density board and EV sponge without scorching the edge? This double-edged straight groove milling cutter carries two edges on a straight flute, so chips leave the cut instead of packing it. Alloy body, five shanks — 3.175 / 4 / 5 / 10 / 12 mm — and ten total lengths from 25 mm to 100 mm. Both edges share one groove, so the same tool covers trimming on a 1/8 in router and on a 12 mm spindle. Custom sizes supported; made in China; price on request.

A trimming bench that runs multi-layer board one hour and EV sponge the next usually hits the same three problems: a scorched edge on density board, chips packing into the groove until the cut drifts, and a separate cutter bought for every panel type. The double-edged straight groove milling cutter is built to clear all three.

It is a two-edge alloy cutter with a straight groove running the full cutting length. Two edges share the cut, so the pass does not pause when one edge leaves the material; the straight groove sends chips straight out of the kerf instead of holding them under the shank. Panels come off with a flat edge and no burn line at the exit.

The cutter is listed in five shank diameters — 3.175 mm, 4 mm, 5 mm, 10 mm and 12 mm — and ten total lengths from 25 mm to 100 mm: 25, 38, 42, 45, 50, 55, 60, 70, 80 and 100 mm. One part family therefore covers a 1/8 in trim router, a 12 mm CNC spindle and the drilling head in between.

It cuts multi-layer board, splint, density board (MDF) and EV sponge. Custom shank diameters and total lengths are supported, the cutters are made in China, and price is quoted against the size and quantity you need.

What the cutter changes at the spindle:

• Two edges, one straight flute — both edges share the same groove, so the cut keeps going when one edge dulls.
• Five shank diameters — 3.175, 4, 5, 10 and 12 mm cover trim routers, CNC spindles and drilling heads from one part family.
• Ten total lengths — 25 to 100 mm in ten steps, so reach is chosen by the job rather than by what is in stock.
• Alloy body — the cutting body is alloy, ground to a straight profile, so edge geometry repeats along the whole length.
• Straight groove chip path — chips leave along a straight channel, which keeps the cut open on MDF dust and on sponge.
• No burning knife — the edge cuts instead of rubbing, so density board leaves the spindle without a scorched line.
• Continuous knife — an unbroken edge along the flute leaves no gap to print a ridge on the finished board.
• Low machining resistance — two edges load progressively, so a 3.175 mm shank is not asked to push a full-width chip.
• Four material families — multi-layer board, splint, density board and EV sponge are all listed applications.

A shop either sends cutters out and waits, or runs whatever bit is in the drawer — and the edge changes with it. This cutter gives one geometry you can reorder.

• One part family, five shanks. Order 3.175 mm for the trim router and 12 mm for the CNC spindle off the same list and keep one spare set.
• No burn line to sand out. A burn-free exit means the panel goes straight to edgebanding instead of back through the sander.
• Chips leave, so depth repeats. A groove that stays open holds the same cut depth over a long run instead of drifting as packed chips push back.
• Continuous edge, flat result. Because the edge is unbroken over the full length, the trimmed face is flat from start to end of the panel.
• Low resistance, less chatter. Progressive loading keeps torque even, which is what a 3.175 mm shank needs to stay quiet in a deep trim.
• Four materials, one cutter. Multi-layer board, splint, density board and EV sponge run on the same geometry instead of four different bits.
• Order the size, not the compromise. Ten lengths and five shanks are stock; anything outside them is made to order.

Multi-layer board, splint, density board (MDF) and EV sponge. Those four are the listed applications, and the same straight groove handles any panel or foam that behaves like them.

Match the collet you already have — the cutter comes in 3.175 mm, 4 mm, 5 mm, 10 mm and 12 mm. The 3.175 mm size fits a 1/8 in collet on trim routers and small CNC heads; 10 mm and 12 mm go into heavier spindles.

Pick the shortest length that still reaches the depth you cut — stock runs 25, 38, 42, 45, 50, 55, 60, 70, 80 and 100 mm. A longer cutter flexes more on a small shank, so a 100 mm body is the wrong choice for a shallow trim on 3.175 mm.

Two cutting edges on one straight groove. When the first edge leaves the material the second is already cutting, so the pass stays continuous instead of pulsing once per revolution.

No burning knife is one of the listed advantages, so the edge cuts rather than rubs. Burn comes from a dull edge dwelling in one spot — keep the feed moving and the exit edge stays clean.

Low machining resistance and continuous cutting are the stated design points, and the straight groove is what maintains them. Chips travel out along a straight channel instead of curling back under the shank.

Yes. Customization is supported. Shank diameter and total length can be made to your drawing, on top of the five shanks and ten lengths already listed.

Price is on request. Send the shank diameter and total length you want and the quote is built for that size; the cutter is made in China.