SHARP Knee Type Vertical Mill Model LMV-49-DVS 9" x 49" table Digital Vari Speed ISO 9002 Certified: Quality Up To World Industry Standards. Meehanite Casting: Highest Grade Of Casting Possible. A Pair Of Precision ABEC-7 Angular Contact Bearings To Support Spindle. The Quill Is Ground And Chromed To Fit The Housing: This Insures A Spindle Run out Of .0002” T.I.R. Motor Shaft And Varidrive Pulleys Are Dynamically Balanced, Then Chromed For A Flawless Fit, Ground Ribs On Inside Diameter: For Smooth Speed Changes. Motor Shaft Has An Oil Channel In The Center That Is Fed By A Grease Fitting On The Lower End: To Keep Vari-Drive Pulley Moving Smoothly On The Shaft. This LMV-49DVS Mill Uses A Roller Bearing For The Lower Support Of The Shaft: It Ensures Proper Loading, Support And Alignment It Also Prevents The Shaft From Being Distorted By The Tension Of The Belt: For Quiet, Accurate Operation At Any Speed For Years And Years. One Shot Lubrication System: For Lubrication Of Ways And Lead Screws. (X,Y And Z-Axis) Hand Scraped Saddle And Knee: For Better Oil Retention. It Avoids Having Chips And Dirt Embed In The Knee And Damage The Sliding Surface. Oil Groove Are Milled: For Maximum Lubrication On All Wear Areas. Table And Saddle Backlash Is Controlled By Double Nut Design: Keeps Lead Screw In Contact With Bronze Nuts An All Times To Keep Backlash At .0008” Within 20”. Table And Saddle Are Mounted With Thrust Bearings That Are Pre Loaded: Eliminating Endplay For Precisely Controlled Lateral Movement. Patient Knuckle Design Uses 6 Bolt 3 Per Side, Securing Them From The Outside: This Method Locks The Head Securely Resulting In Better Accuracy And Performance.