Hardware for Toolholders and Boring Bars

Find Spare Parts for Tool Holders and Boring Bars

Lose a screw, lock pin, or clamp for your boring bar or toolholder? Wondering what the heck a lock pin or clamp is? Use the following guide to help you sort out what you may need in replacement parts for boring bar or tool holders. Find a definition of each component below the picture.

Here is a diagram (click on image to enlarge) of a Multi-Lock Tool Holder courtesy of Dorian Tool:


INSERT
Either conventional type or chipbreaker type may be used.

LOCK PIN
A solid locking pin for permanent locating of the insert.

SHIM SCREW
Reusable shim screw locks carbide shim into toolholder.

CARBIDE SHIM
Forms a firm seat for insert. Fastened to the shank, but easily replaceable. Protects against
damage to toolholder.

CLAMP
Maximum retention clamp is made of high alloy steel, heat treated. Broad clamp nose provides
positive clamping action. Clamp is positioned to allow for maximum insert retention, with or without chipbreaker.

CLAMP SCREW
Rugged Clamp Screw provides maximum clamping strength.

CHIPBREAKER
Solid carbide, for use when chip control is needed. Available in a range of standard chipbreaker
widths.

Most toolholders and boring bars accept generic shim seats, screws, clamps, and pins. This includes tools from Valenite, Sandvik, Kennametal, and Iscar. Check your manufacturers catalog to be sure of the replacement items part number.

PCD Tipped Carbide Boring Bars

PCD Tipped Carbide Boring Bars

PCD Tipped Brazed Boring Tool. For Bore sizes smaller than 8 mm in diameter. PCD is brazed directly to a tungsten carbide shank providing a rigid boring tool capable of remarkable surface finishies and providing a high productive alternative to internal grinding.

For Bore sizes smaller than 8 mm in diameter, it is not possible to use PCD tipped cutting tool inserts. In order to put a PCD tip into the carbide insert, material must be removed. This makes the insert weak and prone to breakage when it is clamped into the boring bar.

At the same time, clamping of small inserts into small boring bars becomes progressively more difficult as the bore size reduces.Top clamps trap swarf and, in order to fit inside the bore, become too small to exert enough clamping pressure. Screw locked inserts, while leaving space for swarf, require sufficient material under the insert for the thread of the clamping screw.

These problems are overcome by using brazed tools. The PCD tip is brazed directly to a tungsten carbide shank providing a rigid boring tool capable of remarkable surface finishes and providing a highly productive alternative to internal grinding.

Valenite Carbide Inserts for Stainless Steel

VALENITE INTRODUCES NEW TURNING GRADES FOR FINISHING, SEMI-ROUGHING STAINLESS STEELS

Valenite LLC has introduced two new tooling grades—expanding its targeted and application-specific lineup that allows users to better match machining operations and workpiece materials with tooling inserts for optimum production efficiencies, quality and economies. The new cutting technologies are the ValProTM VP8515 and VP8525 MT-CVD series of inserts. Both are being developed to augment the existing VP8535 grade and provide a complete range of turning capabilities for 304 and 316 stainless steels, Inconel and heat resistant alloys. The VP8515 is for finishing operations and the VP8525 is used for general duty semi-roughing/finishing. The existing VP8535 is for heavy metal removal tasks and roughing operations.

The VP8515 grade is set for high cutting speed (>200 m/min) at typical finishing

cut depths and has broad applicability with F5, M4, M6, M8, PM2, PM5 geometries. This grade is ideal for continuous turning of austenitic and duplex stainless steels at higher speeds providing reliable and predictable performance, with extended insert service life. Inserts using VP8515 grade have a thin yellow TiN outer coating for easy visual wear identification, an Al2O3 layer for thermal protection, a fine MT-CVD TiCN coating that helps to prevent flaking and reduces flank wear. Also incorporated in the tooling is a gradient area for added surface toughness, and a hard substrate offering greater resistance to wear and plastic deformation.

The TiCN/Al2O3/TiN coating is formulated specifically for turning of stainless steels and to resist sticking, notch wear and edge build-up, for enhanced hardness when hot.

The VP8525’s performance characteristics deliver high cutting speeds (>150 m/min) with mid- to large cutting depths...inserts have M4, M6, M8, R9, PM4, PM5 geometries to cover a myriad of cutting parameters. This grade is a basic choice for general duty M-class turning—continuous or intermittent cutting of austenitic and duplex stainless steels. These tools reduce the risk of plastic deformation and, like the VP8515, provide reliable performance and extended tool life. The VP8525 grade has similar coating technologies, layering and substrate construction as the finishing grade, including the TiCN/Al2O3/TiN coating for the efficient turning of stainless steels.

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Get carbide inserts or cutting tools for stainless steel machining at www.pgstools.com. PGS sells cutting tools and carbide inserts from Korloy, Taegutec, Valenite, Iscar and generic carbide inserts online at discount prices.