Doosan Lynx 220 Machining Parameters: Cutting Speed, Feed & DOC for Steel, Aluminum, Stainless
On the Lynx 220 (Fanuc control, 4,500 rpm spindle / 11-15 kW, 30° slant bed with roller-type linear motion guides), set three factors first — lock in the cutting speed Vc by workpiece material (carbon steel 180-250 m/min, aluminum alloy 300-500 m/min, 304 stainless steel 120-160 m/min), then convert to spindle speed using G96 constant surface speed with a G50 spindle speed clamp; feed rate 0.2-0.4 mm/rev roughing, 0.1-0.15 mm/rev finishing; depth of cut 2-4 mm roughing, 0.3-0.6 mm finishing. Vibration and spring-pass are fundamentally elastic deflection under cutting force and regenerative chatter. Suppression priority: rigidity > cutting speed > feed > depth of cut.
Match the three factors on the Lynx 220 lathe — cutting speed, feed, depth of cut for carbon steel, 6061 aluminum, 304 stainless, with chatter & spring-pass solutions.
2026.08.05
Used Favretto ME/U200 Guideway Grinder Specs & Precision
The used Favretto ME/U200 CNC slideway grinder carries the hardware foundation to meet large machine-tool guideway regrinding tolerance requirements: a 4,000 × 1,000 mm table (1,500 kg load capacity), a 22 kW spindle motor, a 508 mm wheel (1,200/2,800 rpm), linear scales, a B-axis with circular encoder feedback, and 0.001 mm minimum feed on Y/Z. But whether an individual used unit actually certifies to ≤ 0.005 mm/m straightness depends on wear condition and an on-site laser-interferometer acceptance test — not on the nameplate.
Full used Favretto ME/U200 CNC slideway grinder specs, with guideway regrinding tolerance validation.
2026.08.03
Yasda YBM-640V vs Makino V33i: Which Used Machine Should You Buy?
The Yasda YBM-640V and Makino V33i are two of the most sought-after Japanese vertical machining centers on the used market, but they serve fundamentally different applications. The Yasda YBM-640V is a jig borer–class ultra-precision machine (ISO 230-2 positioning accuracy X/Y 1.5μm, Z 2.3μm) built for absolute long-term accuracy in mold, die, and precision jig work — priced at $80,000-180,000 on the used market. The Makino V33i is a high-speed high-precision mold machining center (industry-estimated ±0.003-0.005mm positioning) optimized for productivity in die and mold cutting — priced at $50,000-120,000 used. Choosing between them comes down to three questions: What accuracy do you actually need? What materials are you cutting? What is your maintenance capability? This guide compares both machines across 18 dimensions — specs, pricing, real-world operating costs, and inspection checkpoints — to help you decide. Tip: Browse current Yasda and Makino inventory on UsedUltra using the brand filter.
Compare used Yasda YBM-640V and Makino V33i machining centers across 18 dimensions — specs, pricing, TCO, and inspection tips.
2026.07.27
Used Okamoto Surface Grinder Guide: Why First-Time Buyers Choose It
Okamoto Machine Tool Works is one of Japan's oldest dedicated grinding machine manufacturers, founded in 1926, with its head office established in Tokyo's Ginza district in 1935 and current headquarters in Annaka City, Gunma Prefecture (TSE: 6125.T). First-time used surface grinder buyers choose Okamoto for three reasons: first, accuracy that competes with Swiss brands at 40-60% of the used-market price (PSG series achieves flatness of ±0.001-0.003mm); second, commonly available control systems (touch-panel or Fanuc) with parts and service independent of proprietary brand channels; third, durability — mid-to-high-end models feature hydrostatic guideways with oil-film suspension (<0.001mm accuracy degradation over 15 years), while entry-level V-V guideways are hardened and remain reliable even on 15-20 year old machines. But — you need to know which model fits your workpieces and what to check in a used inspection. This guide builds your selection framework from scratch. Tip: Use UsedUltra's brand filter to browse current Okamoto inventory by equipment type "grinder" and origin JP.
Okamoto used surface grinder buyer's guide — accuracy rivals Swiss brands at 40-60% price. Full model specs, selection tables, and price ranges.
2026.07.23
Used Japanese CNC Brands Compared: Yasda vs Makino vs Okamoto — Precision Strengths & Application Guide
Japanese CNC brands occupy the top tier of the precision pyramid in the used market, but Yasda, Makino, and Okamoto follow fundamentally different technical approaches and serve different applications. Yasda represents the jig borer lineage — ultra-precision machining for mold & die work (ISO 230-2 positioning accuracy X/Y 1.5μm, Z 2.3μm). Makino represents high-speed high-precision machining for mold and aerospace (industry-estimated ±0.003-0.005mm positioning, no published spec). Okamoto represents precision surface grinding (±0.001-0.003mm flatness). Choosing wrong means either paying a 60-100% premium for precision you don't need, or buying a machine that can't hold the tolerances your parts require. This guide delivers hard technical comparisons, used-market price ranges, and a model-selection framework from the used buyer's perspective. Tip: Use UsedUltra's brand filter and category tools to browse current inventory by brand, operating hours, and country of origin.
Compare Yasda, Makino & Okamoto used CNC machines — precision specs, price ranges, and selection framework for first-time buyers
2026.07.21