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The VMT blog is dedicated to sharing our hard-earned knowledge in prototype manufacturing. We hope these articles will help you optimize your product designs and gain deeper insight into the world of rapid prototyping. Enjoy the read!
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2026 08 20 Tolerance in manufacturing is the acceptable differential range for your team to determine the size based on the form, fit and function of the CNC part. While tight tolerances ensure superior dimensional consistency and product quality (at a higher manufacturing cost), overly loose dimensional tolerances can result in assembly failures. Similarly, loose geometric tolerances (such as concentricity errors) can degrade the image performance of precision optical devices. Understanding how CNC machining tolerances affect cost, choice of manufacturing process, inspection options and materials can help you better determine product designs and CNC machining production plans.
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VMT 2026 08 19 We know that AN hoses and joints are often used in racing cars and AN pipe fittings in the aerospace industry. AN stands for Army-Navy, because the specification is based on the flexible fluid connection standard used during World War II. AN connectors have a variety of different angles to assist wiring and gaps. They are straight, 30, 45, 60, 90, 120 , 150 or even 180 degrees.
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VMT 2026 08 19 Common metal like aluminum, stainless steel, or carbon steel can't be that highly dimensional precision across fluctuating thermal environments like invar 36( also named 4J36,UNS K93600, W.Nr. 1.3912, FeNi36, Nilo 36 ). This 4J36 invar alloy' ability (resistance to volumetric expansion or contraction over a wide thermal window) make it stand out among aerospace, optics, metrology, and scientific instrumentation fields. However, machining invar 36 can be difficulty for its low thermal conductivity and good ductile property, and there are details about wall thickness, coating thickness, flatness, etc to be considered.
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VMT 2026 08 18 Common high-gloss CNC machining defects in aluminum parts include horizontal tool lines, vertical chatter marks, entry and exit marks, uneven bright-edge width, white spots, burrs, and scratches. Preventing them requires control of the cutting tool, spindle, fixture, finishing allowance, toolpath, cleaning, inspection, and post-machining handling.
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VMT 2026 08 18 CNC high-gloss machining is a precision cutting process used to create bright, reflective metal surfaces such as aluminum bright edges, chamfers, decorative rings, flat faces, and CD textures. Surface quality depends on the material, tool condition, machine stability, fixturing, toolpath, finishing allowance, and post-machining handling.
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VMT 2026 08 18 CNC milling, or computer numerically controlled milling, is a machining process that uses computer-controlled rotating multi-point cutting tools to incrementally remove material from a workpiece. It can produce custom-designed parts with flat surfaces, pockets, slots, holes, threads, contours, and complex 3D features in metals and engineering plastics.
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VMT 2026 08 17 In this comprehensive guide, we’ll explore everything you need to know about stainless steel fasteners, including their types, material grades, selection principles, and industrial applications. We will also break down the differences between CNC machining and cold heading, outline critical custom manufacturing considerations, and share a case study on solving stainless steel fasteners sealing, galling and premature corrosion challenges.
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VMT 2026 08 15 Thanks to its unique advantages of speed, high weld strength, and clean, precise execution, laser welding is highly popular for thin-walled, high-precision components—especially those requiring minimal thermal distortion, high aspect ratios, or superior hermetic sealing.
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