{"product_id":"bernardo-smerigliatrice-cilindrica-urs-800-n","title":"Bernardo URS 800 N Universal Cylindrical Grinding Machine","description":"\u003cp\u003eThe Bernardo URS 800 N universal cylindrical grinding machine grinds externally from Ø 8 to 8–200 mm and internally from Ø 13 mm, on workpieces up to 800 mm between centers and a maximum weight of 60 kg, with a hydrodynamic spindle, inclinable table, external grinding wheel Ø 400 × 50 × 203, and an internal grinding speed of 20,000 rpm. Manufactured in Austria, distributed in Italy by Krollit as an official Bernardo distributor since 2007.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDistance between centers:\u003c\/strong\u003e 800 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExternal grinding diameter:\u003c\/strong\u003e 8–200 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal grinding diameter:\u003c\/strong\u003e 13–100 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum workpiece weight:\u003c\/strong\u003e 60 kg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorkpiece spindle speed:\u003c\/strong\u003e 25–380 rpm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExternal grinding wheel:\u003c\/strong\u003e Ø 400 × 50 × 203 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal grinding speed:\u003c\/strong\u003e 20,000 rpm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWho uses the URS 800 N and for what\u003c\/h3\u003e\n\u003cp\u003eThe Bernardo URS 800 N is a professional universal cylindrical grinding machine for the precision external and internal grinding of shafts, pins, bushings, and seats: the machine that brings surface roughness below Ra 0.4 µm and dimensional tolerance to the order of hundredths on workpieces up to 800 mm in length. The hydrodynamic workpiece spindle—the main differentiator compared to grinding machines with rolling bearings—ensures constant precision even over prolonged cycles, because it eliminates vibrations transmitted by the bearings. The grinding head, which can be tilted by ±30°, allows the grinding of tapers, spherical seats, and shoulders. In Krollit customers' workshops, it is used by precision mechanical workshops, equipment manufacturers, and industrial maintenance centers that process high-precision components.\u003c\/p\u003e\n\n\u003ch3\u003eWho the Bernardo URS 800 N is for\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eProfile\u003c\/th\u003e\n\u003cth\u003eCompatibility\u003c\/th\u003e\n\u003cth\u003eReason\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eHobbyist\u003c\/td\u003e\n\u003ctd\u003eNot suitable\u003c\/td\u003e\n\u003ctd\u003eIndustrial precision grinding machine. Not suitable for hobby use.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrecision mechanical workshop\u003c\/td\u003e\n\u003ctd\u003eIdeal\u003c\/td\u003e\n\u003ctd\u003eExternal and internal grinding on workpieces up to 800 mm with hydrodynamic spindle: the choice for tolerances in the order of hundredths on shafts and bushings.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIndustrial production\u003c\/td\u003e\n\u003ctd\u003eIdeal\u003c\/td\u003e\n\u003ctd\u003eFor maintenance and production of precision components in continuous cycle.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e workpieces over 800 mm in length (consider a larger model); workshops without knowledge of cylindrical grinding; occasional use where a bench grinder is sufficient.\u003c\/p\u003e\n\n\u003ch3\u003eWorking capacity\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDistance between centers\u003c\/td\u003e\n\u003ctd\u003e800 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCenter height\u003c\/td\u003e\n\u003ctd\u003e180 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal grinding diameter\u003c\/td\u003e\n\u003ctd\u003e8–200 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum workpiece weight\u003c\/td\u003e\n\u003ctd\u003e60 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInternal grinding diameter\u003c\/td\u003e\n\u003ctd\u003e13–100 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax. internal grinding depth\u003c\/td\u003e\n\u003ctd\u003e125 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eTable and feeds\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTable inclination\u003c\/td\u003e\n\u003ctd\u003e+3° to −7°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTable longitudinal travel\u003c\/td\u003e\n\u003ctd\u003e850 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTable feed\u003c\/td\u003e\n\u003ctd\u003e0.1–4 m\/min\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManual table feed\u003c\/td\u003e\n\u003ctd\u003e6 mm\/rev\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWorkpiece spindle and grinding wheel\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eWorkpiece spindle speed\u003c\/td\u003e\n\u003ctd\u003e25–380 rpm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWorkpiece spindle taper\u003c\/td\u003e\n\u003ctd\u003eMT 4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpindle inclination\u003c\/td\u003e\n\u003ctd\u003e+90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal grinding wheel (Ø × H × bore)\u003c\/td\u003e\n\u003ctd\u003eØ 400 × 50 × 203 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal grinding wheel speed\u003c\/td\u003e\n\u003ctd\u003e1670 rpm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInternal grinding speed\u003c\/td\u003e\n\u003ctd\u003e20,000 rpm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrinding head inclination\u003c\/td\u003e\n\u003ctd\u003e±30°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrinding head travel\u003c\/td\u003e\n\u003ctd\u003e200 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompliance and safety\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMarking\u003c\/td\u003e\n\u003ctd\u003eCE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDirective\u003c\/td\u003e\n\u003ctd\u003eMachinery Directive 2006\/42\/EC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eLogistics\u003c\/h3\u003e\u003cp\u003eBernardo shipping: 5–9 working days (7 days to the South). Heavy precision machine: coordinate unloading equipment with Krollit before delivery. Original spare parts available with 3–5 working days shipping. Customer assistance in Italian available.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does \"hydrodynamic spindle\" mean and why is it important?\u003c\/summary\u003e\n\u003cp\u003eThe hydrodynamic spindle supports the shaft on an oil film instead of rolling bearings. This eliminates the micro-vibrations typical of bearings—which transfer to the ground surface as undulations—and guarantees superior dimensional repeatability. It is the standard for industrial precision grinding machines. Grinding machines with rolling bearings cost less but do not achieve the same tolerances.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the achievable dimensional precision with the URS 800 N?\u003c\/summary\u003e\n\u003cp\u003eUnder optimal conditions (well-balanced workpiece, correct grinding wheel, adequate cooling fluid), the URS 800 N achieves dimensional tolerances of IT5–IT6 (order of hundredths of a mm) and surface roughness Ra 0.2–0.4 µm. The actual precision depends on the operator, the type of material, and operating conditions.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat type of grinding wheel is used for internal grinding?\u003c\/summary\u003e\n\u003cp\u003eFor internal grinding, the head reaches 20,000 rpm—necessary to maintain optimal peripheral speed with small diameter grinding wheels. Cylindrical grinding wheels mounted on a mandrel with a diameter compatible with the hole to be ground are used. For different materials (steel, cast iron, aluminum, carbides), grinding wheels of different compositions (corundum, silicon carbide, CBN) are used.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs 45° grinding and taper grinding possible on the URS 800 N?\u003c\/summary\u003e\n\u003cp\u003eYes. The grinding head can be tilted by ±30° relative to the workpiece axis, allowing the grinding of tapers, angled shoulders, and complex shapes. The table can be tilted from +3° to −7° for taper grinding on long workpieces. The combination of the two inclinations covers almost all geometries required in a precision workshop.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat cooling fluid is used?\u003c\/summary\u003e\n\u003cp\u003eFor cylindrical grinding, a 3–5% water+oil emulsion or neat grinding oil is typically used, depending on the material and grinding wheel. The cooling system of the URS 800 N is integrated. Contact Krollit for details on the coolant delivery system.\u003c\/p\u003e\n\u003c\/details\u003e","brand":"Bernardo","offers":[{"title":"Default Title","offer_id":50693163254088,"sku":"05-1371","price":34836.79,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0891\/2139\/0920\/files\/Bernardo_URS_800_N_Smerigliatrice_cilindrica_universale_con_DRO.jpg?v=1758612981","url":"https:\/\/www.krollit.com\/products\/bernardo-grinder-cilindrica-urs-800-n","provider":"Krollit","version":"1.0","type":"link"}