How to Reduce Wasted “Walking” Time in Distribution Operations
In any order picking, assembly, packing, or palletizing process, time spent walking is wasted time
There isn’t much value in a worker walking across a facility; value is realized at work areas, not in transit between them. In many operations, order pickers can walk as many as 12 miles a day. This level of walking makes workers tired and more prone to error, injuries, and declines in productivity. While some degree of walking is unavoidable, much of this is simply commuting time to retrieve supplies, or inefficient design that makes the job harder and less efficient than it should be.
How can you reduce time walking, and increase the time people spend getting things done?
Slash the time spent walking from docks and picking areas for labels, purchase orders, checklists, and other documents
It’s simple: bring computer terminals, printers, scanners, or other needed electronics to the work area, or access this information through tablets or smart phone applications. If your systems support it, tablets are great tools for this, but they do tend to suffer damage in rough warehouse environments.
Using a mobile power workstation allows you to bring computers, RFID scanners, printers, and other electronics where you need them. The stations utilize long-lasting batteries and are available in a number of configurations. They are somewhat expensive, but the accumulated expense of continuously running people from, say a shipping dock to a printer, can be much more costly.
Besides cutting the time it might take to walk between a shipping dock and a printer in the office or at the other end of the building, this can also reduce errors and streamline the shipping process.
Make sure what’s needed on a regular basis is available on a regular basis, either at-hand or just a few steps away
Most operations can start with this in good shape, but as processes and inventories shift, things can degrade. Locating supplies and people who use them in the same area makes sense, but that space is often in demand for inventory, work cells, storage areas, and other important considerations. This can touch on lean and 5S principles. It’s called “Seiton” (Set in Place), and it simply means “a place for everything, and everything in its place.”
Central supply lines: Instead of packing employees having to run for tape, filler, or other materials, dispense it to them systematically so that people doing the work always have what they need is necessary. Don’t force them to find what they need – bring it to them. The real issue may be whether or not you can store the right supplies and inventory in close proximity to those who need it, and get it distributed in time for workflow to remain uninterrupted. Even if you can do that, is there adequate storage space at the work station?
Consider high-density workstations that provide easy access to needed tools and supplies. Consider “over-conveyor” workbenches that can cantilever over the dead air space above a conveyor line. This allows you to claim that air for productive purposes and put supplies & tools right in workers’ hands without eating more of the valuable space in a particular area. These dynamics are mostly about space vs. time, so anything you can do to maximize space is always going to help tilt the equation in your favor.
Consider mobile storage options & regimented replenishment
It’s a great thing to be able to easily store what’s needed, where it is needed, but that can be easier said than done. In a dynamic operation it can be nearly impossible. But you can get around those weaknesses.
For instance, if you have inventory that’s needed for an assembly process, and you are using a lean principle, an order or an assembly may move through straight lines. But rework, changes, or customization can throw you a curve ball. If you can simply roll the needed stock to the work-in-process as needed, you reduce the need for work-in-process or pending orders to shift place in the line.
Mobile carton flow rack is an ideal way to provide instant, first-in, first-out high density storage that you can move to points of value as it is needed, and on to the next when it isn’t.
Reduce the amount of static storage, and increase dynamic storage
By its nature, static storage causes walking. Those long rows of shelving that line distribution center order picking lines are designed for an order picking employee to walk & pick. To a point, this can be fine. Eliminating all walking is not possible, or even all that preferable. Some walking does help refresh and re-focus workers, and in the right situation, static storage is an efficient way to store inventory.
Ultimately, you want people focused on the value-add, not the walk between points of value. Finding ways to do that will improve your entire operation.
Scott Stone is Cisco-Eagle's Vice President of Marketing with more than thirty years of experience in material handling, warehousing and industrial operations. His work is published in multiple industry journals an websites on a variety of warehousing topics. He writes about automation, warehousing, safety, manufacturing and other areas of concern for industrial operations and those who operate them.