Paste the timed readings, choose confidence and allowed error and enter the rating and allowances to get the readings needed, normal time, standard time and required output.
Pre-sizing and estimating tool: results do not replace design, calculations or reports signed by a licensed professional, nor verification against the applicable codes and standards.
Each reading with the mean and ±2 standard deviation limits. Points outside indicate abnormal cycles to investigate.
With the measured variability, how many readings are needed for each relative error and confidence level.
The report gathers this page's inputs, results, equations, assumptions and references, with fields for project, engineer and revision. In the print dialog, choose Save as PDF.
Use n = (z · s ÷ (error × mean))². At 95% confidence, 5% error and a 3% coefficient of variation, 2 or 3 readings are enough; with 10% variation you need about 16.
Normal time is observed time corrected for the operator’s pace. Standard time adds allowances for personal needs, fatigue and unavoidable delays.
The ILO suggests 5% to 7% for personal needs and 4% basic fatigue, plus extras for posture, force, heat, noise and monotony. Totals of 10% to 20% are common in industry.
Important notice: Indus Metrics tools produce estimates and pre-sizing results from the data you enter and from published engineering methods. They do not replace design, calculations or reports signed by a licensed professional engineer (PE), nor verification against the applicable codes, standards and regulations, such as OSHA rules and the ASME codes. Material and fuel properties vary: check manufacturer data or your own process analyses before deciding. By using this site you agree to the Terms of Use.
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