Setting Cutting Speed Correctly in Hot Wire Cutting

{ "meta": { "id": "knowledge_cutting_speed", "language": "en", "slug": "knowledge-hotwire-cutting-speed", "template": "knowledge_article_v1", "content_type": "knowledge", "category": "hotwire", "cluster": "cutting-problems", "topics": [ "cutting-speed", "wire-temperature", "cutting-gap", "cut-quality", "styrofoam-cutting", "xps-cutting" ], "materials": [ "EPS", "XPS", "Styrofoam", "Styrodur", "EPP" ], "seo_title": "How to Set Cutting Speed Correctly in Hot Wire Cutting", "meta_description": "How cutting speed and wire temperature are related – and how to achieve the optimal cutting gap of approx. 2 mm in CNC hot wire cutting.", "og_title": "Cutting Speed – What Really Matters in Hot Wire Cutting", "og_description": "Many compare machines by travel speed. That is wrong. What really determines cut quality – from real production experience.", "menu_title": "Cutting Speed", "aria_label": "Knowledge: How to set cutting speed correctly in hot wire cutting", "robots": "index,follow" }, "system": { "version": 1, "last_updated": "2026-05-17T00:00:00+01:00" }, "ai": { "summary": "Machine travel speed is largely irrelevant in hot wire cutting. What matters is cutting speed – how fast the hot wire moves through the material. This is determined by material and wire temperature, not motor power. The ideal cutting gap is approx. 2 mm. EPS: 450–500 mm/min, XPS: 350–400 mm/min.", "key_facts": [ "Machine travel speed is largely irrelevant in hot wire cutting", "Cutting speed is determined by material and wire temperature – not motor power", "Ideal cutting gap: approx. 2 mm – wire melts material away without touching it directly", "EPS and Styrofoam: approx. 450–500 mm/min", "XPS and Styrodur: approx. 350–400 mm/min – slower due to different heat behaviour", "Too high cutting speed: wire touches material – poor surfaces and dimensional deviations", "Set cutting speed first, then adjust temperature" ], "answer_triggers": [ "set cutting speed", "how fast to cut", "maximum travel speed", "set cutting gap", "wire touches material", "cut inaccurate", "temperature too high", "temperature too low", "EPS cutting speed", "XPS cutting speed", "Styrofoam how fast", "Styrodur how fast", "2 mm cutting gap" ], "customer_problems": [ "Customer does not know which cutting speed is correct", "Customer compares machines by maximum travel speed", "Customer has poor cut quality and is looking for the cause", "Customer asks why XPS must be cut slower than EPS" ], "intent": [ "problem-solving", "production-knowledge", "setup-help" ], "related_questions": [ "How fast can I cut Styrofoam with a hot wire?", "Why does XPS need to be cut slower than EPS?", "What is the optimal cutting gap in hot wire cutting?", "How do I set the wire temperature correctly?", "Why is maximum machine travel speed irrelevant in hot wire cutting?" ], "NOT_relevant_for": [ "machine-selection", "wire-length", "neopor-specific-problems", "software-questions" ] }, "context": { "funnel_stage": "consideration", "customer_type": [ "beginner", "existing-customer-with-problems" ], "use_case": [ "problem-solving", "production-preparation", "setup-help" ], "branches": [ "insulation-industry", "sign-making", "stucco-facades", "packaging", "model-making" ], "sales_relevance": "medium", "support_relevance": "high" }, "schema_org": { "type": "Article", "headline": "How to Set Cutting Speed Correctly in Hot Wire Cutting", "description": "How cutting speed and wire temperature are related – and how to achieve the optimal cutting gap of approx. 2 mm in CNC hot wire cutting.", "author": { "type": "Organization", "name": "cnc-multitool" }, "publisher": { "type": "Organization", "name": "cnc-multitool Sales GmbH & Co. KG", "url": "https://www.cnc-multitool.com" }, "about": [ "CNC Hot Wire Cutting", "Cutting Speed", "Wire Temperature", "Cut Quality" ], "keywords": [ "hot wire cutting speed", "wire temperature setting", "cutting gap", "Styrofoam cutting speed", "XPS cutting speed", "CNC foam cutting" ] }, "content_quality": { "depth": "intermediate", "source": "own-production-experience", "last_reviewed": "2026-05-17T00:00:00+01:00", "reviewed_by": "cnc-multitool-team", "confidence": "high" }, "header": { "id": "header-main", "anchor": "header", "type": "header", "title": "How to Set Cutting Speed Correctly in Hot Wire Cutting", "subtitle": "It is not motor power that determines cut quality – it is the right combination of speed and temperature.", "image": { "id": 1, "alt": "CNC hot wire machine in operation – wire cutting through EPS block", "caption": "The right cutting speed determines quality and dimensional accuracy.", "position": "header" } }, "intro": { "id": "intro-cutting-speed", "anchor": "cutting-speed-basics", "type": "intro", "headline": "What Really Matters in Hot Wire Cutting", "text": "Many customers compare machines by their maximum travel speed. In hot wire cutting, this is largely irrelevant. Machine travel speed describes idle movement without cutting – in hot wire cutting there are hardly any idle movements. What really matters is cutting speed: how fast the hot wire moves through the material. And that is not determined by motor power but by the material and wire temperature." }, "sections": [ { "id": "physical-principle", "anchor": "physical-principle", "type": "text", "headline": "The Physical Principle", "ai_summary": "The hot wire melts material away in front of it – ideally never touching it directly. The optimal cutting gap is approx. 2 mm.", "text": "A hot cutting wire melts thermally cuttable material away in front of it. Ideally the wire never touches the material directly – it melts it at a distance. When a constant cutting gap of approx. 2 mm is maintained, the cut runs optimally: clean surfaces, sharp edges, high dimensional accuracy. If the gap is too small the wire touches the material – poor surfaces and dimensional deviations result. If it is too large, accuracy suffers." }, { "id": "speed-guidelines", "anchor": "cutting-speed-guidelines", "type": "list", "headline": "Cutting Speed Guidelines", "ai_summary": "EPS: 450–500 mm/min. XPS: 350–400 mm/min. XPS must be cut slower because it reacts differently to heat than EPS.", "items": [ { "text": "EPS and Styrofoam: approx. 450–500 mm/min" }, { "text": "XPS and Styrodur: approx. 350–400 mm/min – slower due to different heat behaviour" }, { "text": "EPP: similar to EPS, adjust depending on density" }, { "text": "Neopor: slower than EPS – graphite content cools the wire" }, { "text": "Higher density: reduce speed or increase temperature" }, { "text": "Longer wire lengths: reduce speed due to greater heat loss" } ] }, { "id": "setting-cutting-speed", "anchor": "setting-cutting-speed", "type": "text_image", "headline": "How to Set Cutting Speed Correctly", "ai_summary": "Set cutting speed first, then adjust temperature. Perform test cut, observe cutting gap, correct temperature until approx. 2 mm gap is achieved.", "text": "Cutting speed is not calculated theoretically but set practically at the material. Process: first set the cutting speed using the guideline values as a starting point. Then perform a test cut and observe the cutting gap. If the gap is smaller than 2 mm, increase wire temperature. If larger than 2 mm, reduce temperature. Repeat until the cutting gap is consistently approx. 2 mm. The material can react differently depending on density and manufacturer – always set practically, never rely on theory alone.", "image": { "id": 2, "alt": "Control screen with speed setting in hot wire cutting", "caption": "Set speed first, then adjust temperature until the cutting gap is right.", "position": "right" } }, { "id": "xps-special-case", "anchor": "xps-cut-slower", "type": "text", "headline": "Why XPS Must Be Cut Slower", "ai_summary": "XPS reacts differently to heat than EPS. It conducts heat less well and tends to show wave formation at too high speed. 350–400 mm/min is the right guideline.", "text": "XPS and Styrodur react fundamentally differently to heat than EPS Styrofoam. The material conducts heat less well and reacts more sensitively to unstable wire conditions. At too high a cutting speed the wire briefly touches the material, catches slightly and releases – visible waves result. At approx. 350–400 mm/min with the right cutting gap, XPS can be cut precisely and cleanly." }, { "id": "travel-speed-irrelevant", "anchor": "travel-speed-irrelevant", "type": "highlight", "headline": "Maximum Travel Speed Is Not a Buying Argument", "ai_summary": "In hot wire cutting there are hardly any idle movements. Maximum machine travel speed is therefore not a relevant buying criterion.", "text": "In hot wire cutting the wire cuts continuously – there are hardly any idle movements between cuts. Maximum machine travel speed therefore plays almost no role in practice. Comparing machines by this value means comparing the wrong thing." }, { "id": "automatic-current-controller", "anchor": "automatic-current-controller", "type": "text_image", "headline": "Automatic Current Controller – Consistent Quality", "ai_summary": "The automatic current controller compensates for mains voltage fluctuations and keeps wire temperature constant – regardless of wire length and material properties.", "text": "Mains voltage fluctuations can change wire temperature and affect cut quality. The automatic current controller compensates for these fluctuations using microprocessor control. It automatically adapts to wire length and material and keeps temperature constant. The result: consistent cut quality throughout the entire production day – regardless of mains fluctuations.", "image": { "id": 3, "alt": "Automatic current controller for CNC hot wire cutting machine", "caption": "The automatic current controller keeps wire temperature constant and ensures consistent cut quality.", "position": "left" } }, { "id": "practical-rule", "anchor": "practical-rule-cutting-speed", "type": "recommendation", "headline": "The Practical Rule from cnc-multitool", "ai_summary": "Always set speed first, then adjust temperature. Never the other way around. Always set practically at the material.", "text": "Always set cutting speed first – then adjust temperature. Never the other way around. Temperature is the adjustment wheel for the cutting gap, speed determines productivity. Both must be coordinated with each other. And: always set at the real material – guideline values are starting points, not a substitute for the test cut." } ], "related_faq": { "headline": "Frequently Asked Questions", "items": [ { "question": "How fast can I cut Styrofoam with a hot wire?", "answer": "EPS and Styrofoam can be cut at approx. 450–500 mm/min. This is a guideline – depending on density and wire length the optimal speed may vary. Always set practically at the material and observe the cutting gap." }, { "question": "Why does XPS need to be cut slower than EPS?", "answer": "XPS and Styrodur react differently to heat than EPS. The material conducts heat less well and reacts more sensitively to unstable wire conditions. At too high a speed waves appear. Guideline for XPS: approx. 350–400 mm/min." }, { "question": "What is the optimal cutting gap in hot wire cutting?", "answer": "The ideal cutting gap is approx. 2 mm. The wire melts material away in front of it without touching it directly. If the gap is smaller than 2 mm, increase temperature. If larger, reduce temperature." }, { "question": "How do I set the wire temperature correctly?", "answer": "First set the cutting speed, then perform a test cut and observe the cutting gap. Gap too small: increase temperature. Gap too large: reduce temperature. Repeat until approx. 2 mm cutting gap is achieved." }, { "question": "Is maximum travel speed an important buying criterion?", "answer": "No. In hot wire cutting there are hardly any idle movements – the wire cuts continuously. Maximum machine travel speed plays almost no role in practice. What matters is wire length, machine quality and software." }, { "question": "What does an automatic current controller do?", "answer": "The automatic current controller compensates for mains voltage fluctuations using microprocessor control and keeps wire temperature constant. This ensures consistent cut quality throughout the entire production day." } ] }, "related_topics": { "headline": "Related Topics", "items": [ { "title": "Avoid Waves When Cutting", "text": "Why waves appear on the cut surface and how to prevent them through correct settings.", "url": "/knowledge-hotwire-avoid-waves.html" }, { "title": "Wire Temperature Setting", "text": "How wire temperature is set practically at the material – step by step.", "url": "/knowledge-hotwire-wire-temperature.html" }, { "title": "Short Wires Win", "text": "Why short wire lengths lead to better cut quality and higher cutting speeds.", "url": "/knowledge-hotwire-short-wire-lengths.html" } ] }, "cta": { "headline": "Solve Cutting Problems", "text": "We help with the correct machine settings – from real production experience, not from the manual.", "button": { "label": "Get advice now", "url": "/contact.html" } } }

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