{"product_id":"accessori-griffe-a-gradini-mandrino-m70","title":"Bernardo Lathe Chuck Stepped Jaws","description":"\u003cp\u003eThe Bernardo stepped jaw chuck is a professional lathe chuck available from Krollit, an official Bernardo distributor since 2007.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCompatibility: M70 chuck\u003c\/li\u003e\n\u003cli\u003eIntended use: Professional and advanced hobbyist\u003c\/li\u003e\n\u003cli\u003eMaterial: High-strength metal\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWho uses the stepped jaw chuck and for what\u003c\/h3\u003e\n\u003cp\u003eMechanical workshops and artisan turners use the stepped jaw chuck as a clamping accessory on metal lathes, ensuring secure clamping and centering of the workpiece during turning, drilling, and grooving operations.\u003c\/p\u003e\n\u003ch3\u003eIts place in the Bernardo range\u003c\/h3\u003e\n\u003cp\u003eThe Bernardo stepped jaw chuck is part of Bernardo's range of lathe chucks, distributed in Italy by Krollit since 2007. The Bernardo range includes models of various categories and performances: to choose the right machine for your use case, you can consult the Bernardo catalog on Krollit or contact customer support for selection assistance.\u003c\/p\u003e\n\u003ch3\u003eKrollit logistics and support\u003c\/h3\u003e\n\u003cp\u003eShipping 3-5 business days from Krollit warehouse for spare parts and accessories. Customer support in Italian available for technical documentation and compatibility verification with the reference machine. Krollit has been an official distributor since 2007.\u003c\/p\u003e\n\u003ch3\u003eWho the stepped jaw chuck is for\u003c\/h3\u003e\n\u003cp\u003eThe stepped jaw chuck is recommended for the following professional profiles:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical workshops and artisan turners\u003c\/strong\u003e: secure clamping of round or hexagonal workpieces on metal lathes during turning, drilling, and grooving operations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUsers with a compatible flanged Bernardo lathe\u003c\/strong\u003e: original replacement or upgrade for lathes in the Bernardo range (Profi, Hobby, etc.) with A2 mounting conforming to DIN 55029.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIrregular or non-round workpieces\u003c\/strong\u003e: for asymmetrically centered workpieces, consider 4-jaw independent chucks or universal faceplates.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhen to use this chuck?\u003c\/summary\u003e\n\u003cp\u003eIt is a self-centering chuck for clamping workpieces on a lathe during turning operations.\u003c\/p\u003e\n\u003cp\u003eSelf-centering chucks allow for quick clamping of the workpiece with a single wrench. The choice depends on the shape of the workpiece (cylindrical, square) and the body material (steel or cast iron).\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat material is the chuck body made of?\u003c\/summary\u003e\n\u003cp\u003eThe material is indicated in the title: steel (PO series) for maximum precision, cast iron (DK\/PS series) for standard use.\u003c\/p\u003e\n\u003cp\u003eThe choice depends on usage intensity and required tolerance: steel for production and precision, cast iron for general use.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich diameter to choose?\u003c\/summary\u003e\n\u003cp\u003eThe choice of diameter depends on the lathe spindle nose (it must match the mounting) and the dimensions of the workpieces to be machined.\u003c\/p\u003e\n\u003cp\u003eTypical diameters: 80-160 mm for hobby lathes, 200-315 mm for professional lathes, 400-630 mm for industrial lathes.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I check compatibility with my lathe?\u003c\/summary\u003e\n\u003cp\u003eCheck the type of mounting on the lathe spindle nose (Camlock D3-D15, or threaded M- mounting) and the corresponding diameter.\u003c\/p\u003e\n\u003cp\u003eOn modern lathes, Camlock mounting is the most common. Older lathes may have threaded (M-) or flanged mounting. The lathe's technical documentation indicates the exact type.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow is chuck precision maintained?\u003c\/summary\u003e\n\u003cp\u003eRegular cleaning of the spiral mechanism, periodic lubrication with specific chuck grease, concentricity check every 6 months with a dial indicator.\u003c\/p\u003e\n\u003cp\u003eA jaw that moves with difficulty indicates chips or rust in the mechanism: disassemble, clean, and grease. Concentricity is checked by mounting a ground bar and measuring with a dial indicator: acceptable tolerance 0.03-0.1 mm depending on the model.\u003c\/p\u003e\n\u003c\/details\u003e","brand":"Bernardo","offers":[{"title":"Default Title","offer_id":52450652782920,"sku":"10-60623","price":42.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0891\/2139\/0920\/files\/Griffe_a_gradini_per_mandrino_M70.jpg?v=1770711313","url":"https:\/\/www.krollit.com\/products\/accessories-jaws-a-gradini-chuck-m70","provider":"Krollit","version":"1.0","type":"link"}