Milling drill bit Proxxon 28757, diameter 3.2 mm, single piece

Proxxon 28757 milling drill bit, single piece with a 3.2 mm diameter, is a precision tungsten-vanadium rasp cutter designed for detail drilling and milling in small-scale applications. The single-piece construction provides rigidity for accurate machining and is suitable for use with compatible rotary tools and micro-drills. The cutter is suitable for materials such as wood, plastic, wall tiles, stoneware and drywall when operated at appropriate speeds and with suitable holders or attachments.

Advantages

The solid tungsten-vanadium construction offers durability and wear resistance for repetitive small-scale cutting tasks. The 3.2 mm diameter provides a balance between fine detail and sufficient material removal rate for model making, electronics work and light fabrication. Its single-piece design minimizes runout and wobble for improved precision when used in compatible chucks or tile-cutting attachments.

Suitable for

• Model making and detailed hobby work
• Electronics board trimming and component cavity milling
• Light metal and wood fabrication
• Cutting and shaping wall tiles, stoneware and ceramic materials
• Drywall trimming and small repair jobs

Key specifications

• Cutting head material: tungsten-vanadium
• Diameter: 3.2 mm (approx. 1/8")
• Shank compatibility: small-diameter rotary tool chucks and micro-drills
• Construction: single-piece rasp cutter for reduced runout
• Recommended materials: wood, plastic, ceramic/stoneware, wall tiles, drywall

How to use

Secure the 3.2 mm milling drill bit in a compatible rotary tool or micro-drill chuck, ensuring the shank is held firmly and runout is minimized. Select a rotational speed appropriate for the work material—lower speeds for ceramics and stoneware, moderate speeds for wood and plastic. Apply light, steady pressure and make several shallow passes rather than forcing deep cuts. When cutting tiles or stoneware, use appropriate attachments or fixtures to stabilize the workpiece and reduce chipping.

Usage recommendations

Use cutting fluid or water cooling when working with ceramics or stoneware to reduce heat and prevent premature wear. Wear eye protection and a dust mask when machining materials that generate fine particles. Inspect the bit for wear or damage before use and replace when cutting performance degrades.