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Relating to work shifts...
#1
I have a bit of a dillemma.

It has been suggested to me about changing our shift roster from a three shift rotation of 6 on, 2 off, 6, 2, 6, 2, to 12, 4, 12, 4, 12, 4.

We have four shifts, three on at any given day, the fourth having their "weekend". For ease of understanding I have entered shift numbers in the table below according to the shift they are on. There is no need for weekday names because they are irrelevant, well to me anyway.

M Morning shift
A Afternoon shift
N Night shift
- Off
Code:
You may find this better to see in notepad.

M 111111222222333333444444
A 334444441111112222223333
N 222233333344444411111122
- 443322114433221144332211

This is what needs to happen: I must be able to convert this structure into the above mentioned 12-4 rotation. These rules must apply:
- All crews must not work more than 8 days in a row after a 2 day break, and preferably no more and no less than 6.
- One crew must be on their days off, leaving than three crews on the job.
- The transition is to be as smooth as possible and not have any crews going into the wrong shift. IE, must follow the MAN-MAN rotation.

Here's the best I could do (again, notepad):

Code:
111111222222333333444444 111111111111222222222222333333333333444444444444...
334444441111112222223333 333344444444444411111111111122222222222233333333...
222233333344444411111122 222222223333333333334444444444441111111111112222...
443322114433221144332211 444433332222111144443333222211114444333322221111...
|                      | |                                              |
+--6-2x3 roster--------+ +---------12-4x3 roster------------------------+

Unfortunately this leaves shift 1 doing 12 after 2, and shift 4 doing 10 after 2, especially going from night to morning, where the weekend is shorter in hours by nearly 24. For more information, ask me if you want times for a better understanding.

I would like everyone sliding into the roster without a problem. Moreso without too manhy extra days on or off, not including the 12 days in a row after a four.

Just on that, I tried this with a four day break after 6 on, but 4+6=10 and 12-10=2, leaving the roster two days out of sync. This meant the days off overlapped... I also don't want any more than 4 days off, and any less than 2. But not 3. So either 2 or 4 day breaks to handle it.

Also if possible, phase out the 12-4 system and go back to the 6-2 as previously described as well. This is in case the trial doesn't work. It's all well and good to say "Give everyone time off at the same time." But who would milk the cows three times a day? We have 1500 of them...

Have fun, I'll check back soon.

>anarky
Screwing with your reality since 1998.
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#2
1500 cows? Well, maybe that's your problem... Abstract problems like that wreck my head... sorry I can't help.

matt
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#3
I don't manage the dairy. Just the crew.

>anarky
Screwing with your reality since 1998.
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#4
Anarky,

I've seen dairies that milk 3 times a day, but I've never actually worked with one of these. I'm only familiar with dairies milking 2 times a day.

I can see your dilema. I need you to answer some questions so I can try to help you setting up the shifts.

1) Does milking 3 times a day mean milking every 8 hours?

2) How long does one of these 3 complete milking cycles take?

3) How many total men do you have assigned to milking?

4) How many total men do you need to support one milking cycle?

5) What happens to the actual milk produced during a milking cycle? Do you store it in a holding tank and then process it once a day? Or are you processing directly while your milking? How does this affect the men required for the processing tasks?

6) From start to finish, how long will a milking cycle take? I don't think you want workers going on/off work in the middle of a milk cycle --- I'm guessing.

7) What do you mean by a 6-2 roster? I think I understand your ideas, but your numbers really confuse me.
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#5
1. Generally, yes. That's what we aim for.
2. We aim for 24 hours.
3. Each crew is two people. There are mre, but they work on a different roster. There are two on each shift in this instance.
4. 6 out of 8, since two people (1 crew) must be off work for a break.
5. Milk goes into one of two 20KL vats. Picked up twice a day, pushing 70KL/day. There is no effect on the milkers at all.
6. One cycle technically is about 6-8 hours. At three milkings a day, this is a 24 hour cycle. At times it can go either way by a little, especially during the busy times, but mostly we have managed to stay on schedule.
7. 6 days on, 2 off. Refer to above post.

Hope this helps.

>anarky
Screwing with your reality since 1998.
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#6
I didn't understand your answers to my following questions:

3) How many total men do you have assigned to milking?

4) How many total men do you need to support one milking cycle?

At this point, I'm trying to figure out how many TOTAL men you need, not the crews, shifts or rosters.
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#7
Never mnd that. UI have given the information to work with. Whether I have 1 man to a crew or 100. There are four (4) crews. These are the rotations.

>anarky
Screwing with your reality since 1998.
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#8
Quote:Never mnd that. UI have given the information to work with. Whether I have 1 man to a crew or 100. There are four (4) crews. These are the rotations.

>anarky
I would like to help you, but I need to know the parameters that I feel are important. You should realize that we all analyse problems in a different manner.
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#9
I have given you the information required. If you cannot work it out, don't try. I am not allowed to release any more details anyway. The crews are what needs to be worked out. How many people are on each is not relevant.

End of discussion.

>anarky
Screwing with your reality since 1998.
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#10
Quote:I have given you the information required. If you cannot work it out, don't try. I am not allowed to release any more details anyway. The crews are what needs to be worked out. How many people are on each is not relevant.

End of discussion.

>anarky
Sorry, I didn't know I was asking for privileged information.

Seems like that now leaves you alone with the dilema that you needed help with. Hope you work it out.
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