8 key features. Standard Gilman brand spindles can be motorized belt-driven; they range in size from 1⁄3 to 30 horsepower and are available at fixed speeds. Features include:

• High-quality alloy steel shaft. Case-hardened and precision-ground, the shaft combines a hard outer surface with a tough, resilient core. Shaft threads are also precision-ground, resulting in excellent accuracy.
• Precision grade ABEC-7 angular contact ball bearings are provided as standard. (Model 1250 and 1875 spindles feature ABEC-7 shielded deep groove ball bearings.) Bearings are lubricated with high performance synthetic grease.
• Close-grain, stress-relieved cast iron housings provide excellent dampening and heat-transfer properties.
• Precision runout tolerances down to .0001 T.I.R. are standard, depending on the size of the spindle unit. (For a chart of runout tolerances, click here) Spindles with even higher precision (lower T.I.R. values) can be furnished on request.
• Highly effective standard sealing design includes labyrinth seals with flinging grooves and a gravity drain. Lower speed models feature Nitrile rubber V-ring seals. Air purging can be specified if desired. Models 1250 and 1875 feature a shielded bearing sealing method.
• Special materials and sealing methods can be utilized with any Gilman brand spindle, as may be required by unusual environmental situations.
• Motorized spindles incorporate a 230/460 volt 3-phase 60-Hz totally enclosed fan-cooled motor, with timing belt drives, as standard. (Model 1875 spindles are furnished with a totally enclosed non-ventilated motor.) Poly-V, V-belt, and flat-belt drives are available for applications where high speed and minimum vibration are required.
• Vertical travel spindle units combine a motorized spindle with a slide assembly. The precise and rigid Gilman slide unit is constructed with oil-grooved low-friction bearing material on the saddle-wear surfaces, guided on two precision-ground and hardened rectangular steel ways. Saddle tracking accuracy is .0005 inch per 3 feet of travel. Three different slide drives are offered: manual lead screw right angle drive, powered ball lead screw, and hydraulic cylinder.

Spindle selection and ordering. For information on selecting the proper size spindle to match your application, click here. For detailed information understanding model codes, click here.

Need assistance in selecting a spindle? Call our application engineering department (800-445-6267; in Wisconsin call 262-377-2434; FAX 262-377-9438). Or, write us regarding your application, and we will recommend a standard design or modification, or a custom-engineered spindle to meet your needs. Please describe the application fully, including the type of machine in which the spindle will be used, speed, horsepower, configuration, and envelope or size requirements. SKF Machine Tool Precision Technologies Inc., 1230 Cheyenne Avenue, P.O. Box 5, Grafton, WI 53024.