TSD-Universal’s line of straight collet milling chucks have been designed specifically for rough and finish milling applications where durability, rigidity, compactness, accuracy and ease of operation are required. These U.S. made chucks, available in Kwik-Switch, CV, BT and special shank styles, can accommodate tools with shank sizes ranging from 1/4 to 1 1/4 inches with either of two collet styles.
Each milling chuck features a Roll-Lock design, that deviates from traditional collet chuck construction. Among the unique characteristics associated with this type of design are: 1-Elimination of nut threads; 2-The chuck body serves as master collet resulting in direct gripping of maximum tool shank size; 3-Sealed nut construction; 4-No axial drawback of the tool shank as chuck is tightened; and 5-Thick wall construction to withstand greater side loading forces.
In addition, TSD-Universal milling chucks utilize a unique slotting design and annular grooves within the chuck bore to drive up to 2,500 foot/pounds of gripping torque (approximately 400 foot/pounds with traditional chucks) and high resistance to cutter pull-out.
The elimination of nut threads combined with a highly efficient shallow helical movement through nut rotation with full bearing function results in increased efficiency since all metal-to-metal contact is converted into rolling motion.
As the nut is rotated, the needle rollers roll on a very shallow tapered cone. The needle rollers are mounted in clusters within a race, which alternately staggers the clusters in several annular rings. The rollers are mounted at a slight skew, which tracks into helical movement when rotated clockwise. The rollers then gradually climb up the shallow taper forcing the nut along with it, stretching the nut over the chuck body. A tremendously high uniform force is created, squeezing the chuck body inward and wrapping it around the tool shank. The number and placement of slots and annular grooves cuts the oil film, utilizing maximum frictional advantage.
A rubber seal (stop ring) is located at the rear of the nut. When tightened for maximum gripping power, nut travel is limited to light contact’ with the adjacent shoulder. Normal wrench tightening provides four to five times the gripping power of conventional chucks.
The shallow contact angles produce a self-locking effect, so the chuck will not release during operation. This highly engineered product is designed below the critical load limits of the needle bearings. The rollers become slightly deformed under maximum load conditions, which further helps prevent loosening. When released, the rollers return to their original shape. The staggered clusters of roller groups are strategically positioned to offer the maximum number of rollers to operate within a given area.
Precise axial tool presetting is simplified, since collet drawback during lock-up is eliminated. TSD Universal milling chucks are supplied with a tapped hole at the rear of the bore for convenient tool presetting.
Choice of two styles of straight reducing collets is available; adjustable collets supplied with a preset screw for presetting the depth of the cut; and standard collets designed without a preset screw.
Improved accuracy is inherent in the milling chuck design. TSD Universal milling chucks
are offered to bridge the gap between conventional collet chuck designs and end mill
adapters while going one-step beyond.
Universal Engineering / DeVlieg® Tooling Systems / Tool Preset Service & Calibration
Last updated 02/10/2007