Runout Adjustment System Boosts Collet Holder Accuracy

NT Tool’s HDZ collet holders feature the company’s R Zero runout adjustment system, which uses a four-point mechanism to reduce runout at the tooltip to as low as 0-2 microns.

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NT Tool’s HDZ collet holders feature the company’s R Zero runout adjustment system, which uses a four-point mechanism to reduce runout at the tooltip to as low as 0-2 microns. This reduced runout is said to provide better surface roughness and invariant hole diameters than standard collet holders, making it well-suited for smooth finishing with ball end mills or reamers.

Setup of the adjustment system is designed to be fast and simple, requiring only a spanner to tighten the collet and a wrench to adjust runout of the screws. The adjustment ring can be rotated, allowing runout to be adjusted from virtually any angle.

HDZ holders use the company’s 12-degree-taper FDC collets, which can grip the cutting tool more evenly than 16-degree ER collets, increasing gripping force and reducing slippage. Metal-sealed, coolant-compatible FDC collets also work without sealing rings, further decreasing downtime for routine setup and maintenance.

HDZ holders are available in HSK, CAT (standard and two-face contact), BT (standard and two-face contact), and UTS shank styles. Standard collets cover a chucking range of 0.020"-0.866" (0.5-22.0 mm) in diameter, and custom sizes are readily available. The R Zero system is also available for the company’s CTZ holders for large diameters ranging to 1.25" (42 mm) and PHZ-S slim hydraulic chucks for machining in tight spaces.