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PICK STRATEGIES AND EQUIPMENT Richards- Chapter 5
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Pick Strategies and Equipment Movement between pick locations can account for 50% of the time – aim reduce travel. Figure 5.1 Picking Strategies and Equipment Picker Orders Storage Methods Handling Equipment Picking Operations Hardware and software Picker to goods Goods to picker • Automated picking • Robotics Pick by order • Cluster picking Batch picking Zone picking Wave picking • Compact picking • Order Distribution system Pallet jacks Powered pallet trucks • Cage/trolley Forklift trucks Order pickers • Conveyors AS/RS and mini-load systems • Ergonomic work stations Bulk/floor storage • Conventional racking Very narrow aisle racking Carton flow racks Shelving mobile storage • Carousels - Horizontal - Vertical A-frames Paper pick Pick by label • Scanning • Voice picking • RFID - Automatic - Scanning Pick to light Put to light • WMS • Slotting software • Barcode scanners - Hand held - Wearable RFID scanners Voice units
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Figure 5.1 Pick Strategies and Equipment From the previous slide we can see there are many interrelationships and options. Best in class use advanced methods of picking. Basic techniques such as profiling, slotting, pick-route planning, pick-face sizing, accurate and timely replenishment, proper equipment selection and documented processes will all help to enhance pick efficiency without having to introduce automation until later.
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pes of Picking There are usually four types of picking. o Piece, each, unit, item or broken-case pick; o Full-case or carton pick; o Layer pick; and o Full-pallet pick. However, they can be included on the same order. Pick strategies can be split into three categories. These are: 1. Picker to Goods 2. Goods to Picker 3. Automated Picking
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1. Picker to Goods Pick to order – customer order is picked using pick list, or voice command. Follows path as per list. Advantage of minimum handling. Cluster Pick – pick a number of orders in warehouse but issue of wrong product goes to customer. Batch Pick – same as cluster except orders consolidated to allow picking of items and then later broken into orders. May be sent to reserve area to pick pallet / or layer. Can pick to line or pick to zero. Advantage is travel, disadvantage is two stage process. Zone Pick – picked from defined area in warehouse. Orders are moved from one zone to next, as pick completed. Is suited to large number of SKU’s, multiple orders, or low picks per order. There is potential for bottlenecks. Pick by light is often used in Zone. Faster Wave picking – orders are combined and released at specific times. Associated with vehicle deliveries, replenishment cycles, shift changes, product locations, product commonality, value-adding service requirements and priorities.
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2. Goods to Picker Benefits a.
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