Question

In: Mechanical Engineering

1) Find out the standard time using the following data: Average time for machine elements =...

1) Find out the standard time using the following data:

Average time for machine elements = 6 min.

Average time for manual elements = 4 min.

Performance rating = 110%

Allowances = 10% of normal time

2) The actual observed time for an operation was 1 minute per piece. If the performance rating of the operator was 120 and a 5 per cent personal time is to be provided, the standard time in minute per piece is:

Solutions

Expert Solution

Q 1
Input
1) Avg time for machine elements = 6 min
2) Avg time for manual elements = 4 min
3) Performace rating = 110 %
4) Allowance - = 10 % normal time
To find Standard time
Answer -
Let us find out Normal time for Manual elements
We know,
Normal time = (average element time ) X ( Peformance rating / 100)
     '= ( 4 ) /x (110 /100)
Normal time for manual element = 4.4 min
Thus normal time for whole operation = Avg time for machine elements +  
Normal time for manual elements
Normal time for whole operation = 6 +4.4 = 10.4 min
We know,
Standard time = normal time + allowance time
Here allowance time = 10 % normal time
                                      '= 0.1 x 10.4 = 1.04 min
Hence standard time = 10.4 +1.04 = 11.44 min
Standard time for operation = 11.44 min
Q 2
Input
1) Avg time for machine elements = 0 min
2) Avg time for manual elements = 1 min
3) Performace rating = 120 %
4) Allowance - = 5 % normal time
To find Standard time
Answer -
Let us find out Normal time for Manual elements
We know,
Normal time = (average element time ) X ( Peformance rating / 100)
     '= ( 1 ) /x (120 /100)
Normal time for manual element = 1.2 min

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