Introduction

Tungsten carbide round blanks are sintered solid carbide rods, the raw stock used to fabricate custom cutting tools, wear pins, drills and end mills. Choosing improper diameter or length leads to material waste, extra grinding time or insufficient stock for final machining. Rleey supplies precision carbide round blanks in standard and custom sizes, helping toolmakers select suitable blank dimensions for their custom tool projects.

What Are Tungsten Carbide Round Blanks

Carbide round blanks are unfinished sintered cylindrical bars. They are not final finished parts. Tool manufacturers perform OD grinding, cutting, fluting and edge machining to turn these blanks into finished drills, end mills or wear parts. The blank size must be larger than the final finished dimension to leave enough material for grinding and machining operations.

Key Rules for Diameter Selection

• Reserve adequate grinding allowance on outer diameter for surface finishing
• Check if your grinding machine can handle the blank outer diameter
• For small micro tools, select tight tolerance blanks to reduce removal volume
• Match blank diameter to final tool dimension, avoid oversized blanks that waste expensive carbide material

How To Pick The Right Blank Length

Blank length calculation needs to consider finished tool length, cut-off waste, clamping stock and extra margin. If you cut multiple small components from one long carbide rod, calculate how many pieces you can get from each blank plus saw kerf loss. Longer standard blanks usually have better unit pricing, but you need to confirm your equipment can hold and process long carbide bars safely.

Grinding & Machining Allowance Considerations

Allowance depends on your grinding process and required surface finish. Too little allowance risks leftover surface defects from sintering; too much allowance increases machining cost and cycle time.

Common Size Selection Mistakes To Avoid

• Ignoring saw kerf loss when cutting multiple small parts from one carbide rod
• Insufficient OD grinding stock, cannot fully remove sinter skin
• Ordering blanks too short and missing clamping length for grinding fixtures
• Overbuying large diameter blanks for tiny finished parts, raising raw material cost

FAQ