Specification Brand : VCSHobbies BulletPoint1 : Spindle nose has a 3/4-16 external thread and #1 Morse internal taper BulletPoint2 : Through hole : .405 (10mm) in diameter BulletPoint3 : Made In the USA BulletPoint4 : Motor: 90V DC with electronic speed control converts any input from 100 VAC to 240 VAC, 50 or 60 Hz. BulletPoint5 : Made In the USA BulletPoint6 : Three-stage power downfeed with automatic stop BulletPoint7 : Precision hardened and ground ways Color : Gray ExternallyAssignedProductIdentifier1 : 608729753384 ExternallyAssignedProductIdentifier2 : 0608729753384 ExternallyAssignedProductIdentifier3 : 00662755515958 Horsepower : 0.25 horsepower IncludedComponents : Mill, Flat Way Cover, Pleated Way Cover, Draw Bar, Table Adjustment Handles (x3), Belt Guards (x2), Tool Box (w/tools), ACU-RITE 203 DRO, X-Axis Powerfeed ItemName : Sherline 3307 - Headstock, DC Motor, and Speed Control Assembly (10,000 RPM) ItemPackageDimensions_Height : 76 inches ItemPackageDimensions_Length : 45 inches ItemPackageDimensions_Width : 45 inches ItemPackageQuantity : 1 ItemShape : Rectangular ItemTypeKeyword : power-milling-machines Manufacturer : VCSHobbies Material : Iron ModelName : 3307 ModelNumber : 3307 NumberOfBoxes : 1 NumberOfItems : 1 PackageLevel : unit PartNumber : 3307 PowerSourceType : corded-electric ProductDescription : This headstock features a spindle that rides in large 20 mm bearings at each end with an adjustable preload nut located behind the pulley. The spindle nose has a 3/4-16 external thread and #1 Morse internal taper. The through hole is .405 (10mm) in diameter. The powerful DC motor offers its maximum torque at low RPM where you need it most in machining. This means it offers far more useable power than an AC/DC motor of equivalent or larger size. It also offers smoother and quieter operation than an AC/DC motor. When running the spindle at the higher speeds made possible by the pulley set used on the 3307, the cutting tools are usually very small in size, so a lot of torque is not required. Although the second pulley position lowers the speed range down to that of the standard headstock, the motor provides so much torque that most users find they can leave the pulleys set in the high speed position even when doing more demanding milling jobs with larger cutting tools and lower speeds. A second pulley position provides a lower top speed but multiplies the power to provide more torque, particularly at low speeds. The maximum speed of 2200 RPM approximates the speed of the standard pulley set provided with all Sherline machines. (Note: Because of the high speed capability of this unit, the factory preload setting has been reduced from .0002"" of end play to .0003"" of end play. This allows higher speed and reduces bearing heating." ProductSiteLaunchDate : 2011-12-20T08:00:00.000Z Speed : 10000 rpm Style : Grizzly SupplierDeclaredDgHzRegulation : unknown UnitCount : 1 Voltage : 110 volts Wattage : 45 watts