{"uid":"cap_L9fgtJIEKjj7LmeT8h41Q","slug":"machining-fasteners-calc-spindle-rpm-surface-speed-505fea48","name":"Machining & Fasteners Calc – Spindle RPM / Surface Speed","description":"Spindle rpm for a diameter at a surface speed (SFM or m/min), or the surface speed an rpm gives.","url":"https://machining-calc.x402tookit.com/speed-rpm?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["diameter"],"properties":{"rpm":{"type":"number","description":"Spindle rpm to get the surface speed instead"},"units":{"type":"string","description":"imperial (default) or metric"},"diameter":{"type":"number","description":"Cutter or workpiece diameter, inches (imperial) or mm (metric)"},"surfaceSpeed":{"type":"number","description":"Surface speed, SFM (imperial) or m/min (metric); send this or rpm"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"rpm":{"type":["null","number"]},"asOf":{"type":["null","string"]},"units":{"type":["null","string"]},"source":{"type":["null","string"]},"reasons":{"type":["array","null"],"items":{"type":"string"}},"summary":{"type":["null","string"]},"verdict":{"type":["null","string"]},"degraded":{"type":["boolean","null"]},"diameter":{"type":["null","number"]},"disclaimer":{"type":["null","string"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}},"surfaceSpeed":{"type":["null","number"]}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_aYC67Yh6VG54Fnr1IisrW","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Converts between spindle RPM and surface speed (SFM or m/min) for a given cutter or workpiece diameter.","exampleAgentPrompt":"What spindle RPM do I need to run a 0.5-inch carbide end mill at a surface speed of 300 SFM? Give me the result in imperial units.","exampleUseCases":[{"title":"CNC milling RPM from surface speed","prompt":"I'm milling aluminum with a 12 mm carbide end mill at a recommended surface speed of 200 m/min — what spindle RPM should I set on my CNC, using metric units?"},{"title":"Lathe turning speed check","prompt":"I'm turning a 3-inch diameter steel bar on my lathe at 1500 RPM — what surface speed in SFM am I actually cutting at?"},{"title":"Drill press speed for HSS drill","prompt":"I need to drill mild steel with a 3/8-inch HSS twist drill at 80 SFM. What RPM should I set my drill press to, in imperial?"}],"resultDescription":"Returns the computed spindle RPM (when surface speed is provided) or the surface speed (when RPM is provided), along with the input diameter, units, and a plain-English summary. May include a disclaimer or data-quality notes.","failureModes":["Missing required diameter parameter returns an error","Neither surfaceSpeed nor rpm provided — endpoint requires exactly one of these","Invalid unit string (not 'imperial' or 'metric') may cause unexpected results","Extremely large or small values may produce physically unreasonable outputs without explicit validation warnings"],"whenToPreferThis":"Choose this endpoint when you need a quick, paid-per-call calculation of spindle RPM from surface speed (SFM or m/min), or the reverse, for a known cutter or workpiece diameter. It is purpose-built for machining contexts and supports both imperial and metric units, making it ideal for CNC programming, manual lathe/mill setup, or automated toolpath validation workflows.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T13:12:38.303Z","isFirstParty":false,"canonicalSlug":"machining-fasteners-calc-spindle-rpm-surface-speed-505fea48"}