Vincent PCD CNC Writing Bit – 60 Degree Angle, 10 mm Diameter, 66 mm Length

The Vincent CNC writing bit is a 60° polycrystalline diamond writing bit for engraving lettering and line work into stone on a CNC.

Spindle speed: 6,000 RPM
Feed rate: 4–8 in./min (100–200 mm/min)

Point angle: 60° · Shank: 0.39 in. (10 mm) shank

Key Features

• PCD rather than sintered diamond: a solid polycrystalline tip holds a sharp point far longer, which is what keeps letter strokes even across a long engraving run.
• Vincent publishes 6,000 RPM at 4–8 in./min (100–200 mm/min) for the writing bits — engraving is a slow-feed operation and pushing it rounds the point.
• 60° point for V-cut lettering.
• 0.39 in. (10 mm) shank — fits Vincent's collet and grub-screw adapters into a 1/2 in. Gas holder.

Who Is This For

A high-production shop cutting memorial lettering, house numbers, logos or reference marks on the machine rather than sandblasting them. PCD holds its point through unattended cycles, so the last letter of a long run matches the first.

It is not a cutting or profiling tool and will not survive being fed like one. It engraves a shallow V; depth comes from multiple passes, not from a heavier one.

It needs an adapter. The bit has a 0.39 in. (10 mm) shank and CNC spindles take 1/2 in. Gas, so a collet or grub-screw adapter sits between them.

Frequently Asked Questions

What speed and feed?
Vincent publishes 6,000 RPM at 4–8 in./min (100–200 mm/min).

What is PCD?
Polycrystalline diamond — a solid sintered diamond tip rather than a plated or bonded layer. It holds its point, which is why it costs more than the widia bits in the same table.

How does it mount?
Through an adapter: the shank is 0.39 in. (10 mm) shank and the spindle is 1/2 in. Gas.

60° or 90°?
This is the 60° bit. A narrower point cuts a deeper, finer stroke; a wider point is more robust and reads better at a distance.