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Estimativas de Observações de Tempos

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Como estimar o número de observações ideal para precisar o tempo de determinada atividade?

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Estimativas de Observações de Tempos

  1. 1. Estudo de TemposEstipulando o número de observaçōes necessárias para melhor precisão
  2. 2. Variação do Tempo de Ciclo• Posição das peças e ferramentas do operador;• Leitura do Cronômetro;• Início/término do ciclo.
  3. 3. Diminuindo as Variações• Padronização de matéria prima;• Ferramentas e equipamentos em boas condições;• Condições ideais de trabalho;• Operador qualificado e bem treinado;
  4. 4. • Quanto maior o número de observações, mais preciso será o resultado;• Quanto maior a variabilidade das leituras de um elemento, maior o número de observações para se obter a precisão desejada.
  5. 5. Estipulando o número de observações Método EstatísticoOnde: Total de todas as observações Total de cada observação colocada ao quadrado Total de todas as observações colocado ao quadrado n : Número de observações obtidas
  6. 6. Elem. 1 Elem. 2 Total (Total Ciclo Ciclo) 2Obs. 1 12" 2" 14" 196Obs. 2 11" 1" 12" 144Obs. 3 11" 2" 13" 169 Total 39 509 = 39 = 509 = 1521n = 3
  7. 7. 3 x 509 = 1527
  8. 8. 1527 - 1521 = 6
  9. 9. Raiz quadrada de 6 = 2,45
  10. 10. 40 x 2,45 = 98
  11. 11. 98 / 39 = 2,51
  12. 12. 2,51 x 2,51 = 6,31
  13. 13. Descobrimos que são necessárias 7 observações para melhor precisão de tempo para a atividade.
  14. 14. Ob!gado !

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