DT023/3 10982 MANS3 III Section B Question 5 ay A particular machine has a loadi
ID: 3199903 • Letter: D
Question
DT023/3 10982 MANS3 III Section B Question 5 ay A particular machine has a loading time of 150 hours in a particular 7 day period. hours every 7 set-ups take average of 15 hours, and breakdown failures average s rated ed days. During the time when the machine is running. it averages 92% of its in 3% of the parts processed by the machine were subsequently found to be some way. All the is outlined in Table 5.0. Loading Time/Week 150 Hours Quality Losses During Run 3% of parts Set-Up & Changeover Time 15 Hours/week Breakdown Failure Rate 5 Hours/Week Performance Machine runs at 92% of rated speed Machine Table 5.0: OEE Planning, Numbers Note: OEE Formulae are available in the Formula Sheet 12 De ine the following i) Valuable Operating Time (h's) Overall Equipment Effectiveness (h's) Comment briefly as to how Engineering might assist in improving the competitiveness of this operation?Explanation / Answer
5 (a)
(i)
OPERATING TIME = ACTIVE TIME – LOSSES 1-2 DOWNTIME
= 150 -15 - 5 = 130
NET OPERATING TIME = OPERATING TIME – LOSS3 DOWNTIME
= 130 - 0 = 130
PERFORMING TIME = NET OPERATING TIME – LOSS4 DOWNTIME
= 130- 3.9 =126.1
VALUABLE OPERATING TIME = PERFORMING TIME – LOSSES 5-6 DOWNTIME
= 126.1- 6.305 =119.795
(ii) OVERALL EQUIPMENT EFFECTIVENESS = VALUABLE OPERATING TIME/Active time
119.795/150= 0.7986
(b)
Q = v2DS / H (1-dp)
Q2 = 2DS / H (1-dp)
Set up cost = (Q2) (H) (1-dp)/ 2D
=(1202) (12) [1-(120/960)] / 2 * 31200
= 14400 * 12 * 0.875 / 62400
= 151200 / 62400
= $2.42
Setup time = Setup cost/ $ 20 = 7.26 min
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