How hard is the cutting material?

The carbide grade used in this diamond double arc circular 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 double arc circular 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 double arc circular bottom knife

PCD double-arc round-bottom bits (Z2), D 19.05-38.1 mm, R 6.35 mm, shank 12.7 mm. Constant-radius concave grooves for cabinet finger pulls and decorative reveals.

The VPOINT Diamond double arc circular bottom knife is a replaceable-knife cutting tool. Ideal for cabinet and drawer finger pulls, decorative groove and reveal cutting and door and panel detailing.

Product Description

The VP0028 series round-bottom bit pairs a solid PCD cutting edge with a 40Cr chrome-molybdenum steel body; the double-arc profile cuts a concave groove with a constant radius across the width. Diameter, radius and width follow the specifications table.

Design and Construction

The VP0028 series round-bottom bit pairs a solid PCD cutting edge with a 40Cr chrome-molybdenum steel body. The double-arc profile cuts a concave groove with a constant 6.35 mm radius. Cutting diameters (ØD) run 19.05 to 38.1 mm with a 12.7 mm shank (Ød) and 15.9 mm cutting height (H); the two-flute (Z2) geometry balances finish and chip clearance.

How It Works

The double-arc profile forms a consistent concave groove in a single pass — the geometry used for cabinet finger pulls and decorative reveals. Because the radius is constant along the full cutting height, grooves cut at different depths keep the same profile, and the PCD edge holds the radius in abrasive faced boards.

Applications

Cabinet and drawer finger pulls
Decorative groove and reveal cutting
Door and panel detailing
Furniture profile work on CNC routers

Suitable Materials

Melamine-faced particleboard and MDF
Laminate (HPL) sheets
Veneered plywood
Solid wood

The PCD edge holds the arc radius in abrasive sheet goods, keeping the groove profile stable across long production runs.

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 steel, cast iron and low-volume general work — but on abrasive sheet goods the difference in service life is decisive.

Property	PCD Diamond (This Tool)	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 acrylic / plastics	10–15× longer (1,000–3,000 h)	100–200 h (baseline)
Resharpening cycles	5–8 regrinds (thick tips up to 10); each pass removes only 0.2–0.3 mm of diamond	4–6 regrinds, each removing more material
Surface finish	Ra ≤ 0.2 μm achievable, stable over the tool life	Ra ~0.8 μm typical, degrades as the edge wears
Thermal conductivity	540–560 W/m·K — heat leaves the edge fast	~80 W/m·K
Friction coefficient	≈ 0.05 — lower cutting forces	≈ 0.3
Suited for	Abrasive engineered wood, laminates, composites, plastics, non-ferrous metals	General-purpose; the only choice for steel and cast iron

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

Delivery Scope

Single cutter. Order by part number with the diameter stated in the specifications table below.

Why Choose VPOINT

One-year warranty on every cutter — defects in material or workmanship are covered for 12 months from delivery.
Custom tooling — geometries, diameters, cutting lengths and shank configurations built to your drawing or sample.
Non-standard fabrication — profiles and sizes outside the standard catalogue, including profile restoration and special applications.
Resharpening service — cutters return to service after regrinding, restoring near-original edge performance at a fraction of new-tool 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 tool, and our engineering team will quote the exact specification you need.

Precision & Quality Control

Every cutter is inspected at micron level before shipment. Cutting edge condition, cutting diameter (ØD), shank diameter (Ød), cutting length (L1) and overall length (L) are measured against the values listed in the specifications table, and cutting edge runout and concentricity are verified on the assembled tool.

Tools measuring outside tolerance are reground or scrapped — they 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
VP002801	19.05	12.7	15.9	6.35	2
VP002802	22.1	12.7	15.9	6.35	2
VP002803	25.4	12.7	15.9	6.35	2
VP002804	28.6	12.7	15.9	6.35	2
VP002805	31.8	12.7	15.9	6.35	2
VP002806	34.5	12.7	15.9	6.35	2
VP002807	38.1	12.7	15.9	6.35	2

Frequently Asked Questions

What is the Diamond double arc circular bottom knife used for?

The VP0028 series round-bottom bit pairs a solid PCD cutting edge with 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 and MDF, Laminate (HPL) sheets, 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: PCD round bottom bit, diamond arc groove cutter, cabinet pull router bit, finger pull cutter