SHARS 8" 4 JAW INDEPENDENT LATHE CHUCK TIR CERTIFICATE + 2-1/4"-8 BACK PLATE NEW. For back plate you would not need to drill any mounting holes but you will need to turn the shoulder D1 down. 040 to match the back of the lathe chuck to make the chuck & back plate more concentric with the lathe spindle and reach chuck's TIR. Each high quality chuck comes with a.
Thru Hole Diamter: 2.953. Bolt Circle Diameter: 3.740.
For use gripping odd shaped work. Chuck includes one set of reversible jaws.
Four jaws allow a square component to be perfectly centered to the chuck while achieving maximum gripping force. Jaws are made of high quality carbon steel, and hardened.
Thrust bearings and operating screws are made of case hardened steel. Clamping Range A-A1: 0.591-5.118. Jamming Range B-B1: 3.150-9.843. Included 1 set of reversible solid hard jaws. Mounting Thread Size: T=2-1/4-8 TPI.Bolt Circle Diameter: D2=3.74. How to process back plate to guarantee Chuck's T. As long as back plate Shoulder Diameter > chuck's D1, all 8 chuck will fit in.
All back plates have 0.04 allowance, please measure the size of Chuck's D1 before process your back plates. The size of back plates's D1 should be a little bit smaller than the size of Chuck's D1.
Because the gap between back plate and chuck is smaller, chuck's TIR is better. No gap is the best.
D1 need to be processed before back plate can be mounted. You would not need to drill any mounting holes but you will need to turn the shoulder down. 040 to match the back of the lathe chuck to make the chuck & back plate more concentric with the lathe spindle. When turning the shoulder of the backing plate, ONLY TURN THE SHOULDER OF THE BACKING PLATE WHEN ATTACHED TO THE LATHE SPINDLE.If you use a chuck to clamp the backing plate and then turn it, the backing plate will not be true to the lathe spindle and will have more runout than specified when the chuck and back plate are put together. The item "SHARS 8 4 JAW INDEPENDENT LATHE CHUCK TIR CERTIFICATE + 2-1/4-8 BACK PLATE R" is in sale since Friday, May 10, 2019. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Workholding & Toolholding\Workholding\Other Workholding". The seller is "discount_machine" and is located in Saint Charles, Illinois. This item can be shipped to United States, Canada.