MONDAY, JULY 23, 2018
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Topic Pick and Pack Time

Pick and Pack Time

Home Forums Operations Supply Chain Pick and Pack Time

This topic contains 10 replies, has 5 voices, and was last updated by  Ron 5 days, 15 hours ago.

Viewing 11 posts - 1 through 11 (of 11 total)
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  • #677968 Reply

    Jignesh

    How do I can calculate per piece picked in how many seconds and in one hour how much is the productivity. For example: I have 6 staffs working 8 hours and one pick slip having 2946 pcs. so i want to know how many seconds they have taken for one piece.

    #677971 Reply

    Jignesh – The more details you provide, the more likely you are to get a response. What do YOU think you should do? Why or why not? The iSixSigma audience is helpful, but they like to see that someone is putting forth a good-faith effort; they are not here to do your work for you.

    #706446 Reply

    Hi i was searching through the web on reducing the traveling time for picking and I found this in the old forums archives:
    https://www.isixsigma.com/topic/order-picking-six-sigma/

    However, there isn’t any follow up after the last post.

    I have collected the data but the data is very large (approx 300,000)-6 months of data- and I have problems doing the control charts.
    Anyone has similar problem and know how to solve this ?
    I am just afraid that by reducing to only 1-2 months might not be representative.
    Any tip is appreciated.
    Thanks !

    #706448 Reply

    For starters how about expanding on what it is that you and (apparently Jignesh) are doing?
    1. What, precisely is a pick and pack time process?
    2. What kind of data do you have?
    a. just some counts of picking something from somewhere (pieces of fruit off of a tree, picking bits of litter along a street, etc.)
    b. just some estimate of time to pick a piece of fruit or is someone standing around timing people.
    3. Besides counts of something picked and some measure of time to do this what else are you recording? Time of day, days of the week, shift changes, etc.
    4. Your post gives the impression that you have a bunch of data and you want to go straight to control charting – if this is the case then you have a LOT of work to do before you start that.

    If you will provide a detailed description of the process and what it is that you want to do you might get a response as opposed to the lack of responses to the original poster.

    #706449 Reply

    Hi
    i don’t know what the thread starter wants, i want ride on the thread since it is on similar topic.

    1. What, precisely is a pick and pack time process? – I am not asking this.
    2. What kind of data do you have? – picking traveling time ie. after one
    a. just some counts of picking something from somewhere (pieces of fruit off of a tree, picking bits of litter along a street, etc.)
    b. just some estimate of time to pick a piece of fruit or is someone standing around timing people.

    – picking traveling time in seconds ie. from the time the picking is done to the next location

    3. Besides counts of something picked and some measure of time to do this what else are you recording? Time of day, days of the week, shift changes, etc.
    – yes, time of the day, days of the week, week, shift, type of product pick, picker etc. in any case i am looking at only 1 shift to narrow the scope.

    4. Your post gives the impression that you have a bunch of data and you want to go straight to control charting – if this is the case then you have a LOT of work to do before you start that.
    – no, i didn’t go straight into control chart.
    it has been verified that the data is normal.

    that brings to the next question, is there anyway to work on MSA reducing travel picking time since one has to simulate at least the same order lines, same 10 order products to 3 pickers at 3 different times of the day? anyone has done such simulation before and it is certainly very time consuming and to do this on a weekend would mean that the environment is changed but to do during weekdays would add burden to the day to day operations.

    i have already filtered the data to reduce the scope and i am thinking of how do i select the number subgroups as the picking is very dynamic, as soon as the order is placed, it is automatically transmitted to the warehouse for picking by the various pickers. so it is not like the factory where it has a fixed timing producing certain number of items in a channel where one can easily divide them into subgroups : “for example, a die cut machine produces 100 plastic parts per hour. The quality engineer measures five randomly selected parts every hour. Each sample of five parts is a subgroup.”- source: minitab support

    Is it ok that i dissect the pick time further into time intervals, and then randomly select the pick lines, say 20 lines per week each for 26 weeks (so effectively, i will have 520 samples) ? then i can use a X bar R chart, but then again, i have different pickers so how can i incorporate this?

    Thks.

    #706451 Reply

    1. What, precisely is a pick and pack time process? – I am not asking this.

    Yes, I know, the problem is I am asking this since neither you nor the original poster have given anyone any idea of what your are doing and the statement “from the time the picking is done to the next location” is bereft of information. So, again, what is this process and how does it work?

    Given an operational definition of your process someone may be able to look at what you have provided and offer some thoughts. One thing – your comment concerning data normality under the statement about control charts is bit of a puzzle – the two are not connected.

    #706458 Reply

    I don’t know what Jignesh means for pick and pack.

    For my picking in question, it is just picking of parts and then measure the travelling time for the time picker finishes picking one part and travel to another location to pick another.

    One thing – your comment concerning data normality under the statement about control charts is bit of a puzzle – the two are not connected. – I am not saying that they are connected, i am just trying to tell you that i am not some trolls out there who asks questions and “have a bunch of data and you want to go straight to control charting – if this is the case then you have a LOT of work to do before you start that.”

    I just need some pointers on how to dissect the data to feed into the control tools to analyse if it is stable or has some special causes that i need to investigate.
    Then i can continue my analysis.

    Anyone out there who has tried to reduce travel picking time in a warehouse before?

    #706459 Reply

    So, all your process consists of is taking a part (or I guess if they are small enough) some quantity of parts from one location in a warehouse and delivering them to some predetermined spot and then turning around and going back to some other location in the warehouse and repeating the same process. Based on what I’ve read it sounds like you are looking at personnel performance in an Amazon type setting.

    1. Is the delivery spot the same for all of the pickers?
    2. Since all of the parts are not equidistant from the delivery spot how are you taking into account variation in travel time?
    3. If it is an Amazon type setting the parts are stacked on racks that reach from floor to a very high ceiling – how are you taking into account the time needed to pull something from the first tier vs the time needed to pull something from the top tier?
    4. Is part weight, bulkiness, size an issue? If it is then how are you taking into account this impact on an individuals ability to transport the part from the rack to the delivery point?
    5. Is the process actually one of get a single order (part) and immediately deliver that single order to the processing location or is it a case of having an assigned number of parts and delivering the parts only after the all of the parts in a given order have been located? If it is the latter then how are you taking into account all of the issues listed above?

    Since this is a time-motion study I would recommend, as a first pass, that you simply chart part acquisition to part delivery time for each of the pickers across your chosen time period and look at the patterns.

    Based on my understanding there does not appear to be any natural grouping so the issue is reduced to running IMR charts on each of the pickers and asking if there is any significant difference in means, medians, and standard deviations of elapsed times. This question will probably have to be addressed to more than the overall time plot. For example – burn in time for pickers – I would assume a novice will have longer delivery times for some period after hiring.

    If you do find significant differences you will need to go back to the time plots and start asking questions such as those outlined above in order to make sure you are comparing like to like.

    #706462 Reply

    @rbutler Your second response showed a lot of patience.

    #706467 Reply

    Thanks, good points. will take note.
    I was thinking of grouping based on the time intervals (8-10, 10-12 etc) but then again there are also other factors as what you have mentioned.
    so i guess IMR is the way to go.

    #706508 Reply

    Ron

    Jignesh,
    Your description sounds like a picking operation in a order fulfillment process. Unfortunately the variation in your product is unknown!
    Based on what you told us I would focus on two things: 1)Time to fill the order (not pieces), 2)Distance each picker covered.
    Trying to come up with a per piece pick time would be of little value. How frequently is an item picked, how far do the pickers travel, shift to shift variations, How many picks are accomplished per shift, these are all pieces of information that will help you better understand your process.
    a Spaghetti diagram of the route pickers take would be very helpful. Locating the most frequently picked items in one area is a possible solution if your goal is to improve picking time.
    Lets us know your progress.

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