How hard is the cutting material?

The carbide grade used in this diamond round bottom knife delivers 7,000–9,000 HV / 1,500–2,000 HV hardness, which keeps the cutting edge sharp under continuous load.

Can you supply OEM or ODM parts, and how fast?

Yes. VPOINT TOOLS runs two factories in China (Chengdu and Dongguan) and accepts OEM and ODM orders. Standard samples and in-stock items ship within 24-48 hours; custom tooling is quoted per specification.

Which machines and materials is this diamond round bottom knife used for?

It is used on CNC routers, table saws and spindle moulders for cutting particle board, MDF, plywood, solid wood and aluminium composite panels. Chipbreaker or replaceable-insert models are available for high-volume production runs.

Do you ship worldwide?

Yes. VPOINT TOOLS ships carbide and PCD woodworking tooling to more than 100 countries. Tell us the destination and application and we will confirm freight cost and lead time.

Diamond round bottom knife

The company uses high-end production and testing equipment from Germany, selects international high-quality raw materials, and provides customers with professional supporting production tools and related accessories. The products include saw blades, forming knives, handle milling cutters, drill bits, and various diamond tools.

The VPOINT Diamond round bottom knife is a replaceable-knife cutting tool for CNC machining centres. Built for CNC machining centres in daily production.

Product Description

The VP0016 diamond round bottom knife is a PCD-tipped round-nose router bit on a 12.7 mm shank, covering cutting diameters from 3 to 50.8 mm, cutting lengths from 2.5 to 28 mm and corner radii from 1.5 to 25.4 mm in a two-flute form, as listed in the specifications table.

Design and Construction

The VP0016 diamond round bottom knife carries a solid polycrystalline diamond cutting edge on a 40Cr chrome-molybdenum steel body. The round-nose geometry runs two flutes, and each part number fixes the cutting diameter, corner radius and cutting length — from 3 mm miniature work up to 50.8 mm profile passes on a single 12.7 mm shank series.

How It Works

The round-nose profile cuts a half-round groove or rounds over an edge with the radius built into the tool, so the result matches the part number chosen. The PCD edge holds that radius in abrasive faced board, keeping the groove width and corner shape stable across long runs.

Applications

Round-bottom grooves on CNC routers
Edge rounding on panel furniture
Decorative half-round profiles
Sign making and cabinetry work

Suitable Materials

Melamine-faced particleboard
MDF and laminated boards
Veneered plywood
Solid wood

The PCD edge holds the radius and finish through long production runs in abrasive sheet goods.

Material Comparison: PCD vs. Tungsten Carbide

The figures below are typical industry data for production woodworking. PCD does not replace carbide in every job — carbide remains the right choice for low-volume general work — but on abrasive sheet goods the difference in blade life is decisive.

Property	PCD Diamond (This Blade)	Tungsten Carbide
Hardness	7,000–9,000 HV	1,500–2,000 HV
Tool life on MDF / particleboard / melamine	15–20× longer (500–1,200 h)	30–60 h (baseline)
Tool life on solid hardwood	10–13× longer (800–2,000 h)	80–150 h (baseline)
Tool life on abrasive boards (fibre cement / composites)	10–15× longer	baseline
Edge renewal	Limited regrinds — the economics come from 15–20× longer intervals between changes, not regrind count	4–6 regrinds at shorter intervals
Cut finish	Ra ≤ 0.2 μm achievable, stable over the blade life	Ra ~0.8 μm typical, degrades as teeth wear
Thermal conductivity	540–560 W/m·K — heat leaves the tooth tip fast	~80 W/m·K
Friction coefficient	≈ 0.05 — lower cutting forces and heat	≈ 0.3
Suited for	Abrasive engineered wood, laminates, composites, fibre cement, non-ferrous metals	General-purpose solid-wood work; the economic choice at lower volumes

Figures are typical published values; actual blade life depends on the workpiece material, feed rate, depth of cut, machine condition and maintenance schedule.

Delivery Scope

Single blade. Order by part number with the diameter, bore, width and tooth count stated in the specifications table below.

Why Choose VPOINT

One-year warranty on every blade — defects in material or workmanship are covered for 12 months from delivery.
Custom tooling — diameters, kerfs, bores and tooth counts built to your drawing or sample.
Non-standard fabrication — sizes outside the standard catalogue, including bore re-sizing and tooth-count changes.
Resharpening service — blades return to service after regrinding at a fraction of new-blade cost.
Factory-direct since 2008 — ISO 9001 manufacturing in Sichuan and Dongguan, China; 40Cr chrome-molybdenum steel bodies; no trading intermediaries.

Send a drawing, a sample or a worn blade, and our engineering team will quote the exact specification you need.

Precision & Quality Control

Every blade is inspected before shipment. Outside diameter, kerf thickness, plate thickness, bore diameter and tooth count are measured against the values listed in the specifications table, and tooth geometry (hook angle, bevel angle) is verified against the design drawing. Blades are stress-checked for runout and tension before packing.

Blades measuring outside tolerance do not ship. Inspection is performed under our ISO 9001 quality system, with batch records retained for traceability.

Specifications

Part No.	ØD	Ød	H	R	Z
VP001614	3	12.7	2.5	1.5	2
VP001615	4	12.7	3	22.5	2
VP001601	5	12.7	5	3	2
VP001609	6	12.7	6	3.175	2
VP001610	6.35	12.7	6	4	2
VP001602	8	12.7	6	4.76	2
VP001611	9.52	12.7	8	5	2
VP001603	10	12.7	7	6	2
VP001616	12	12.7	8	6.35	2
VP001604	12.7	12.7	8	7.95	2
VP001620	15.9	12.7	10	8	2
VP001605	16	12.7	8	9.5	2
VP001612	19.05	12.7	11	25	2
VP001613	22.2	12.7	13	11.1	2
VP001606	25.4	12.7	15	12.7	2
VP001617	28.6	12.7	16	14.3	2
VP001607	30	12.7	17	15	2
VP001618	32	12.7	18	16	2
VP001619	34.9	12.7	19	17.45	2
VP001621	38.1	12.7	22	19.05	2
VP001608	40	12.7	22	20	2
VP001622	44.45	12.7	25	22.225	2
VP001623	50.8	12.7	28	25.4	2

Frequently Asked Questions

What is the Diamond round bottom knife used for?

The VP0016 diamond round bottom knife carries a solid polycrystalline diamond cutting edge on a 40Cr chrome-molybdenum steel body.

How do I choose the right size?

Refer to the specification table on this page: part numbers fix the cutting diameter, shank and cutting length. State the diameter, shank and cutting length you need when ordering.

Which materials does it suit?

Typical materials include Melamine-faced particleboard, MDF and laminated boards, Veneered plywood. Confirm the material grade and machining conditions for the specific tool before ordering.

Can I order a custom version?

Yes. Send the profile drawing or item code together with the workpiece material, machine model, cutting direction and quantity. Tools are produced to order, and each tool is packed in an individual plastic box.

Key words: diamond round bottom knife, PCD round nose router bit, core box bit, half round router bit