A wide groove and a deep groove are two different purchases. Most tooling conversations blur them. They don’t blur on the machine.
The kerf is width. The diameter is depth. A blade’s kerf fixes the slot width — 5.8mm once, in one pass, no widening passes and no stacked bodies. The diameter fixes the cutting circle, and the cutting circle fixes how deep you can reach before the body or the flange interferes. Buy a narrow blade for a wide slot and you spend the pass twice. Buy a small blade for a deep slot and you run out of body. This blade answers both at once: 5.8mm wide on a 238mm circle.
A wide cut is a clearance problem before it is a sharpness problem. A wide kerf removes more material per tooth engagement than a narrow one, and it presents more body area to the slot walls. That is why side clearance matters more the wider you go: the carbide tips have to stand proud of the plate by enough that the steel body never drags on the slot wall. In LIVTER’s own grooving family, that clearance runs around 0.5 to 0.6mm per side — 3.6mm kerf over a 2.6mm plate, and 5.0mm over 3.8mm. At 5.8mm, that clearance is the difference between a slot that runs free and one that burns, because a body touching the wall generates friction, friction generates heat, and heat is what scorches the groove.
24 teeth and a flat-top edge: two decisions, not one. Tooth count and tooth geometry solve different problems, and on a 238mm blade it helps to keep them apart. The count is about chip room: a 5.8mm cut produces a heavy chip load, and 24 teeth on this diameter leaves gullet volume to carry it away before it packs in and gets re-cut. The geometry is about finish: every one of those 24 teeth is flat-top, presenting a square edge on a common plane, so the slot walls shear clean and the floor comes out flat across the full width. A flat floor is the whole point for a groove that has to seat a tongue, a panel or a spline. An alternating-bevel blade will cut the slot; it will not cut one you can register a panel against.
The bore carries the load. A 5.8mm cut in solid stock puts real torque through the arbor, and torque is what makes a round bore on a keyed spindle a bad bet. This blade runs a 40mm bore with a single keyway, so the blade is mechanically locked to the spindle rather than relying on clamping friction alone. No slip, no index shift, no groove that steps halfway down the board. The 40mm size also tells you the machine class: dedicated grooving equipment, not a general-purpose table saw.
On heat, and on honest specification. Wide cuts generate heat faster than narrow ones — more material removed per unit of time, more friction, more thermal growth in the plate. The usual engineering answer is radial expansion slots, which give the steel somewhere to grow and a hooked or relieved end to arrest any crack before it reaches the bore. This model is built on a solid plate with no expansion slots. We state that plainly rather than implying a thermal design it does not have. If your production runs are long and continuous, confirm your duty cycle and any recommended continuous cutting limit with us before you commit the blade to a line.
Selection Guide
| Your situation | What to look at |
|---|---|
| Wide slot, one pass, no stacking | Kerf first — specify the width you need to final size |
| Deep groove in solid stock | Diameter; the cutting circle sets the reachable depth |
| Groove must seat a tongue or panel flush | Flat-top (FTG) grind — floor flatness is the requirement |
| Heavy chip load at wide kerf | Tooth count sized for gullet volume, not for density |
| Keyed spindle, high torque | Bore with a keyway, matched to the arbor |
| Long continuous runs | Confirm duty cycle — this model has no expansion slots |
Common Failure Modes
| Symptom | Typical cause | Remedy |
|---|---|---|
| Groove walls scorched | Body dragging on the slot wall — insufficient side clearance | Verify tip-to-plate clearance; confirm kerf against plate |
| Groove width drifts over a long run | Thermal growth with no expansion relief | Reduce continuous cutting time; confirm duty cycle |
| Groove floor not flat | Wrong grind — alternating bevel where FTG is required | Specify flat-top |
| Slot width under size | Kerf narrower than required, forcing a second pass | Re-specify kerf to final width |
| Depth not reached | Diameter too small for the required depth | Move up in diameter |
| Blade slips or shifts index | Round bore on a keyed spindle; keyway not engaged | Confirm keyway engagement and arbor fit |
| Chipped teeth | Excessive chip load, or foreign material in the stock | Reduce feed per tooth; inspect incoming stock |
5.8mm kerf blade / wide kerf grooving blade / 238mm grooving blade / grooving blade side clearance / flat top grooving blade
