High precision fine boring tool
309/310 series BIG Kaiser Precision Tooling Inc.

Kaiser 309 & 310 boring heads are designed for precision production boring on machining centers, boring mills, transfer machines and high speed milling machines. Their fully enclosed, compact and rugged design allows reliable operation, even under extreme cutting conditions.

The Kaiser 309 & 310 heads feature highly accurate and smooth micrometer adjustment precision. Each size of head is available with either inch or metric graduations which are easily read from a large dial. The adjustability of Series 310 heads is .0005"/Ø, .0001"/Ø with Vernier, or .01mm/Ø, .002mm/Ø with Vernier. Series 309 features .00005"/Ø, without Vernier markings!

The unique locking system prevents any diameter shift under locking action forces and maintains diameter under all cutting conditions, assuring of the highest repeatability. An additional feature is the simultaneous locking of the adjusting dial, preventing accidental adjustments. All tool carrier movement is strictly radial, making length corrections required on angular mounted boring cartridges unnecessary.

All insert holders are designed for use with positive rake indexable inserts. Self-centering, center-clamping screws are used, eliminating top clamps which obstruct efficient chip evacuation. Through spindle coolant capability is standard on all 309 & 310 heads.