{"product_id":"ruota-affilatura-cuoio-bernardo-nts250pro-200mm","title":"Bernardo Leather Honing Wheel for NTS 250 Pro \/ NTS 250 Pro Vario","description":"\u003cp\u003e\u003cstrong\u003eBernardo Leather Honing Wheel for NTS 250 Pro \/ NTS 250 Pro Vario – Ø 200 × 30 mm, center Ø 12 mm\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eLeather honing wheels represent a technical investment for workshops that require constant precision during intense work cycles. Unlike grinding wheels, leather allows for a mirror finish and controlled application of fine abrasive paste for high-speed steel tools.\u003c\/p\u003e\n\u003cp\u003eIn the context of the NTS 250 Pro lathe (and the Vario version with automatic speed change), this wheel is used for the final stages of sharpening HSS tools and for restoring them after long working periods. The 200 mm diameter maintains a constant peripheral speed even on high-power spindles.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDifference compared to NTS 200:\u003c\/strong\u003e NTS 250 Pro lathes operate at higher spindle speeds and more intense loads. The Ø 200 mm wheel ensures optimal peripheral speed (1,500-2,200 rpm on 250 Pro) without altering the abrasive paste-leather adhesion ratio.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDistinctive features of the Bernardo product:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAdhesive natural leather, professional quality\u003c\/li\u003e\n\u003cli\u003ePrepared for fine abrasive paste (aluminum oxide grit 240-400)\u003c\/li\u003e\n\u003cli\u003eQuick M12 thread mounting compatible with NTS 250 Pro spindles\u003c\/li\u003e\n\u003cli\u003eCompetitive price for high-frequency sharpening cycles\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWho is the Bernardo NTS 250 Pro sharpening system with leather wheel suitable for?\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eProfile\u003c\/th\u003e\n\u003cth\u003eSuitable?\u003c\/th\u003e\n\u003cth\u003eReason\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCraftsman \/ small workshop (parallel metal lathes)\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eAdequate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNTS 250 Pro is a professional machine, often oversized for pure craftsmanship. Useful if regular workloads and frequent sharpening are required.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIndustrial maintenance and spare parts\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eIdeal\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNTS 250 Pro is the gold standard for reconditioning HSS tools under continuous loads. Higher spindle speed guarantees sharpening cycles 40% faster than on NTS 200.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProfessional job-shop workshop (diversified machining)\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eIdeal\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eThe Vario version with automatic speed change allows for rapid switching between roughing and finishing sharpening without manual intervention. Requires an experienced operator.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries production (small repetitive batches)\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eAdequate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSharpening during a series is feasible, but long cycle times suggest evaluating integrated carbide CNC systems if the series is \u003e500 pieces.\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\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHobbyists and small workshops without regular sharpening cycles — NTS 250 Pro machine investment not justified without continuous use\u003c\/li\u003e\n\u003cli\u003eOperations on non-ferrous materials (aluminum, copper) — leather if damaged, requires dedicated equipment\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\u003ch4\u003eDimensions and mounting\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter diameter\u003c\/td\u003e\n\u003ctd\u003e200 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWidth\u003c\/td\u003e\n\u003ctd\u003e30 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHole diameter \/ center (thread)\u003c\/td\u003e\n\u003ctd\u003eØ 12 mm (M12 × 1.75 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight\u003c\/td\u003e\n\u003ctd\u003e10 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eForm tolerance\u003c\/td\u003e\n\u003ctd\u003eAccording to EN ISO 1302 (natural leather, ±1 mm permissible)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch4\u003eMaterial and composition\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eVegetable-tanned natural leather, professional quality\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdhesion to backing\u003c\/td\u003e\n\u003ctd\u003ePermanent bonding to phenolic core\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface grit\u003c\/td\u003e\n\u003ctd\u003eFine, prepared for abrasive paste (grit 240-400)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch4\u003e\u003c\/h4\u003e\n\u003ch4\u003eCompatibility with Bernardo machines\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eMachine\u003c\/th\u003e\n\u003cth\u003eCompatible?\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eNTS 250 Pro\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eYes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDirect M12 mounting, speed 350-2,200 rpm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNTS 250 Pro Vario\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eYes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCompatible, automatic speed change not affected\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNTS 200\u003c\/td\u003e\n\u003ctd\u003eYes, but not recommended\u003c\/td\u003e\n\u003ctd\u003eGeometry suitable but 200 mm diameter redundant for smaller machine\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOther Bernardo machines\u003c\/td\u003e\n\u003ctd\u003eCheck manual\u003c\/td\u003e\n\u003ctd\u003eIf M12 × 1.75 mm spindle is present, mounting is possible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch4\u003e\u003c\/h4\u003e\n\u003ch4\u003eCompliance and markings\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eBernardo GmbH, Linz (Austria)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBernardo item code\u003c\/td\u003e\n\u003ctd\u003e05-20610\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompliance\u003c\/td\u003e\n\u003ctd\u003eNot subject to Machinery Directive 2006\/42\/EC (accessory component)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of origin\u003c\/td\u003e\n\u003ctd\u003eAustria\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003c\/h3\u003e\n\u003ch3\u003eStandard equipment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLeather wheel Ø 200 × 30 mm mounted on phenolic core\u003c\/li\u003e\n\u003cli\u003eM12 × 1.75 mm thread (center compatible with NTS 250 Pro \/ NTS 250 Pro Vario spindles)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently asked questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between a fine and coarse wheel for NTS 250 Pro?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe fine wheel (this product, Ø 200 × 30 mm) is for the final sharpening stages and produces a mirror finish, 30-60 seconds per tool at 1,500-1,800 rpm. The coarse wheel is used for roughing heavily worn tools, 15-30 seconds at 800-1,200 rpm. Recommendation: have both in stock for complete reconditioning cycles.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the NTS 250 Pro Vario have any incompatibility with the 05-20610 leather wheel?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The automatic speed change system (Vario feature) is independent of the spindle. M12 thread mounting is identical to the standard NTS 250 Pro. The only adaptation: check the recommended plexiglass guard for speeds \u003e2,000 rpm on Vario (higher maximum speed compared to the basic 250 Pro).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I choose between the Ø 200 × 30 mm (05-20610) wheel and other Bernardo sizes for NTS 250 Pro?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBernardo offers few diameters for NTS 250 Pro (mainly Ø 200 mm). The 200 mm diameter is standardized for peripheral speeds of 1,500-2,200 rpm on this machine. If you are looking for other sizes, contact Krollit to check availability and compatibility.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the 05-20610 wheel suitable for sharpening solid carbide or only HSS?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Recommended for HSS. Solid carbide is too hard and damages natural leather. Bernardo offers alternative solutions for carbide (synthetic wheels or CBN systems) — consult Krollit for options.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the life cycle of this wheel for NTS 250 Pro under intense use?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWith frequent sharpening and daily cycles, durability is 2-3 years. Typical deterioration: leather hardens, loses paste adhesion, no longer achieves a mirror finish. With maintenance (regular brushing, paste activation), life can be extended up to 4 years.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I activate a new 05-20610 wheel before first use?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBrush at low speed (600-800 rpm) with a rotating wire brush for 1-2 minutes. This raises the leather grain and prepares the surface for paste adhesion. Then apply fine Bernardo abrasive paste 05-20602 in powder form, increase speed to 1,500-1,800 rpm, and test on a trial tool.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat maintenance does this wheel require between sharpening cycles?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAfter each sharpening session (every 5-8 tools): light brushing with a dry cloth to remove paste residue. Every 100 hours of use: mechanical brushing with a wire brush + application of new paste. Every 6 months: check leather adhesion (it must not detach from the phenolic core).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the 05-20610 wheel included in the Bernardo warranty or the Krollit machine warranty?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBernardo 24-month warranty on manufacturing defects (leather delamination, core fractures, defective thread). Does not cover natural wear and tear. If purchased as part of a Krollit maintenance contract for the machine, check with the sales office for inclusion in the terms.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I mount the 05-20610 vertically (like grinding) instead of horizontally (like sharpening)?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The leather design and the NTS 250 Pro spindle assume a horizontal setup for operator safety and uniform paste adhesion. Vertical mounting causes uneven compression of the leather.\u003c\/p\u003e","brand":"Bernardo","offers":[{"title":"Default Title","offer_id":52994890269000,"sku":"05-20610","price":44.4,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0891\/2139\/0920\/files\/Bernardo_ruota-affilatura-cuoio-nts250pro-200mm-frontale.jpg?v=1777370940","url":"https:\/\/www.krollit.com\/products\/ruota-affilatura-cuoio-bernardo-nts250pro-200mm","provider":"Krollit","version":"1.0","type":"link"}