The model 4R Twin-Mount spindle combines a high-power brushless-DC motor (liquid cooled) with a model 4R BLOCK-HEAD® air bearing spindle for the most demanding applications. This is the spindle to use in a rapid-cycle, start/stop operation, or when the ultimate in speed stability is required. Features Model 4R BLOCK-HEAD® air bearing spindle Cast-iron housing for horizontal axis or vertical axis operation Custom faceplate per customer specifications* Dynamically-balanced spindle rotor Brushless-DC motor mounted directly to the spindle Resolver motor commutation for smooth rotation Motor controller with wide speed range Available with integral 1 hp AC induction motor All required connectors and cables Performance Speed Ranges: 0-2,000 rpm 0-5,000 rpm 0-10,000 rpm Torque: Up to 60 lb-in continuous Speed Regulation: As low as 0.0001% Motor performance can be tailored to your application. Motors with narrower speed ranges will have better low-speed torque and speed regulation. Load capacity, stiffness, and accuracy of the 4R BLOCK-HEAD® air bearing spindle are unaffected by the motorization process. Options Motor style Encoders of various levels of precision Vacuum work holding Water cooling for motor Piloted faceplate for ultra-accurate interchangeable chucks, collets, or wheel mounts Applications Ultra-precise workheads for I.D. and O.D. grinding Ultra-precise lathe headstocks Spin table for Moore G-18 jig grinder Spin table for roto grinding on a surface Flycutter spindle for ultra-flat mirrors Grinder wheelheads, especially for diamond wheels Roundness testers |