NT Tool’s Runout Adjustment System Improves Collet Holder Accuracy

Originally titled 'Runout Adjustment System Improves Collet Holder Accuracy'

NT Tool’s original “R” Zero system uses a four-point adjustment mechanism to adjust runout at the tool tip to as low as 0-2 microns.

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Even with minimal runout near the nose of the holder, conventional collet holders frequently see larger runout when measured at the cutting edge of longer tools, the company says. NT Tool’s original “R” Zero system eliminates this problem by using a four-point adjustment mechanism to adjust runout at the tool tip to as low as 0-2 microns. The reduced runout of NT’s HDZ collet holders provides better surface roughness and invariant hole diameters than standard collet holders, making it an especially useful choice for smooth finishing with ball end mills or reamers.

The four-point adjustment system is simple, and the full procedure can be completed in less than a minute. Setup only requires a spanner to tighten the collet, and an adjustment wrench for the runout-adjustment screws. The adjustment ring can be rotated, allowing runout to be adjusted from any angle.

Like many of NT Tool’s collet holders, HDZ holders use the company’s 12-degree taper FDC collets. By using a more gradual taper than 16-degree ER collets, FDC collets grip the cutting tool more evenly, increasing gripping force and reducing slippage. Metal-sealed, coolant-compatible FDC collets have the added benefit of working without sealing rings, further decreasing downtime for routine setup and maintenance, the company says.

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 wide chucking range (0.020” - 0.866” diameters/0.5-mm - 22.0-mm diameters), and custom sizes are available.

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