When turning the shoulder of the backing plate. 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. Because the gap between back plate and chuck is smaller. The size of back plates's D1 should be a little bit smaller than the size of Chuck's D1. Please measure the size of Chuck's D1 before process your back plates. The fully-machined back plate can be mounted onto 8" 3 jaw or 4 jaw self centering or independent lathe chuck(p/n 202-5434. more T.I.R? The semi-machined back plate has to be processed into fully-machined which is showed in the above fig before they can be mounted. Thread size: 1-3/4"x 8, Diameter A: 8.11" B: 866" C: 925" D: 3.583" How to process back plate to guarantee Chuck's.
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