Re: Standard Times and Cycle Times Information
Cycle time is fairly easy to calculate as you stated. Its simply the total time taken ,between successive parts. Easy to measure, time how long it takes to produce 10 parts, divide by 10 and you get the average cycle time for each part.
Standard time depends upon the context, for example is this standard time being used for costing purposes or an incentive rate? In general standard time can be calculated using either predetermined times, or time studies. The key with both of these approaches is the estimate of the work pace of the person doing the job. Standard work in the strictest sense is based on the time it will take an average person working at an average pace (defined as 100%) to perform a task. Standard time also has factors built into it such as personal and fatigue to account for the fact that a person can not sustain this pace for an 8 hour day.
It is the addition of these allowances such as personal and fatigue which make standard time a fuzzy number and a number that should use with caution.
To further complicate things, you have to deal with the interaction between the operator and the machine since some tasks are performed concurrently with the machine (internal work) and other tasks are performed with the machine down (external work).
Typically, industrial engineers are the type of people of who are trained to develop standard times.
Bottomline - unless you are using this time for costing or incentive pay, stick to measuring cycle time
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