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Boring of the jaws of a lathe chuck using a mandrel. Detailed instructions. The mandrel is used to restore the geometry of the locating surfaces of straight jaws of lathe chucks. The mandrel is suitable for chucks from the following manufacturing countries: Russia, Belarus, China, Poland. The accuracy of clamping the workpiece after boring the jaws is from 0.01 to 0.015 mm. The mandrel is made of spring steel that has undergone hardening and high tempering, and has a hardness of 32 - 35 units according to Rockwell. The mandrel is coated with a protective corrosion-resistant coating. Chernega Rose: https://chernegarose.com/ - Website-shop https://chernega-rose.turbo.site/shop - Mobile website-shop https://vk.com/chernega_rose - VK Group https://t.me/chernegarose - Telegram channel