Turning Time
Calculate the cutting time of one turning pass, t = L ÷ (f·n), from the length to machine L (mm), the feed f (mm/rev) and the rotation n (rpm). The product f·n is the tool feed rate (mm/min); dividing the length by it gives the pass time. This is the PRODUCTIVE cutting time of a longitudinal turning operation (the tool traversing the part length), and the basis of total fabrication time and thus machining cost and production planning. Total time also includes non-productive times (tool approach and retract, part change, measuring, tool change) and the number of passes needed (depending on material to remove and depth per pass). Cutting time — by raising feed and rotation (and thus cutting speed) — is the path to productivity, always within tool life, machine power and required finish limits. This is essential to quote machined parts and size a machine shop's capacity. Enter the length, feed and rotation.
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Tempo de torneamento
O tempo de corte em uma passada de torneamento é t = L ÷ (f·n), a partir do comprimento a usinar L, do avanço f e da rotação n. O produto f·n é a velocidade de avanço da ferramenta (mm/min); dividindo o comprimento por ela, obtém-se o tempo da passada. Este é o tempo produtivo de corte de uma operação de torneamento longitudinal (a ferramenta percorrendo o comprimento da peça) e é a base do cálculo do tempo total de fabricação e, portanto, do custo de usinagem e do planejamento da produção. O tempo total inclui ainda os tempos improdutivos (aproximação e recuo da ferramenta, troca de peça, medição, troca de ferramenta gasta) e o número de passadas necessárias (que depende do material a remover e da profundidade de corte por passada). Reduzir o tempo de corte — aumentando o avanço e a rotação (e portanto a velocidade de corte) — é o caminho para a produtividade, sempre dentro dos limites de vida da ferramenta, potência da máquina e acabamento exigido. Este cálculo é essencial para orçar peças usinadas (o tempo de máquina é um custo central) e para dimensionar a capacidade produtiva de um parque de máquinas. Informe o comprimento, o avanço e a rotação.
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Material Removal Rate (Turning)
Calculate the material removal rate (MRR) in turning, Q = Vc·a_p·f, from the cutting speed Vc (m/min), the depth of cut a_p (mm) and the feed f (mm/rev). The result, in cm³/min, is the material volume removed per unit time — the direct measure of machining PRODUCTIVITY. Maximizing MRR (cutting fabrication time and cost per part) is the core goal in roughing, achieved by increasing any of the three factors: cutting speed, depth or feed. But there are limits and trade-offs: higher speed shortens tool life (Taylor); higher depth and feed raise the cutting force and power required (which may exceed machine capacity or cause chatter) and worsen finish. So the typical strategy uses high MRR in ROUGHING (productivity) and low in FINISHING (precision and roughness). MRR times the material's specific cutting energy gives the required power. Enter the cutting speed, depth of cut and feed.
Machining Spindle Speed
Calculate the spindle speed (RPM) needed in machining, n = (1000·Vc) ÷ (π·D), from the desired cutting speed Vc (m/min) and the diameter D (mm — workpiece in turning or tool in milling). It is the inverse of the cutting-speed calculation, and the most used on the shop floor: the operator knows the material, picks the recommended cutting speed from tables, and must convert it to the rpm to set on the machine. The relation reveals a key point: for the same cutting speed, SMALLER-diameter parts or tools require HIGHER rpm (and vice versa). So turning a part of varying diameter (facing, tapers) at constant cutting speed requires continuously varying the rpm — done automatically by CNC lathes (G96, constant surface speed), while on conventional lathes the operator adjusts by ranges. Getting rpm right is essential for tool life, finish and safety (excessive rpm on large parts creates dangerous centrifugal forces). Enter the cutting speed and the diameter.
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The results provided by this tool are for general informational and educational purposes only and do not constitute professional, financial, medical, legal, tax or accounting advice. Always confirm important decisions with a qualified professional and official sources.