# Therblig Analysis

THERBLIG ANALYSIS CHECKLIST | | | | | | |Reach and Move |Yes No | | |1. Can either of these therbligs be eliminated? | |• | | |~ |2. Can distances be shortened to advantage? | |• | | | |3. Are the best means (conveyors, tongs, tweezers) being used? | |• |• | | |4. |Is the correct body member (fingers, wrist, forearm, shoulder) being used? | |• |• | | |5. Can a gravity chute be employed? | |• |• | | |6.

Can transports be effected through mechanization and foot-operated devices? | |• |• | | |7. Will time be reduced by transporting in larger units? | |• |• | | |8. |Is time increased because of the nature of the material being moved or because of a | | | | | | |subsequent delicate positioning? | |• |• | | |9. Can abrupt changes in direction be eliminated? |• |• | | |Grasp |Yes No | | |1.

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Would it be advisable for the operator to grasp more than one part or object at a time? |• | |• | | |2. |Can a contact grasp be used rather than a pickup grasp? |• | |• | | |3. |In other words. can objects be slid instead of carried? |• | |• | | |4. Will a lip on the front of bins simplify grasping small parts? |• | |• | | |5. Can tools or parts be pre-positioned for easy grasp? |• | |• | | |6. Can a vacuum, magnet. rubber fingertip, or other device be used to advantage? |• | |• | | |7. Can a conveyor be used? |• | |• | | |8.

Has the jig been designed so that operators may grasp the part easily when removing it? |• | |• | | |9. Can the previous operator pre-position the tool or the work, simplifying grasp for the | | | | | | |next operator? |• | |• | | |10. Can tools be pre-positioned on a swinging bracket? |• | |• | | |11. Can the work table surface be covered with a layer of sponge material so that the fingers | | | | | | |can enclose small parts more easily? • | |• | | |Release |Yes No | |~ | | | | | | | |1. Can the release be made in transit? |• | |• | | |2. Can a mechanical ejector be used? |• | |• | | |3. Are the bins that contain the part after its release the proper size and design? |• | |• | | |4. At the end of the therblig release, are the hands in the most advantageous position for the next | | | | | | |therblig? • | |• | | |5. Can multiple units be released? |• | |• | | |Pre-Position |Yes No | | |1. Can a holding device at the workstation keep tools in the proper positions and the | | | | | | |handles in upright positions? |• | |• | | |2. Can tools be suspended? |• | |• | | |3. Can a guide be used? |• | |• | | |4. Can a magazine feed be used? |• | |• | | |5. Can a stacking device be used? |• | |• | | |6.

Can a rotating fixture be used? |• | |• | | |Use | |Yes No | | |1. Can a jig or fixture be used? |• | |• | | |2. |Does the activity justify mechanized or automated equipment? |• | |• | | |3. Would it be practical to make the assembly in multiple units? |• | |• | | |4. |Can a more efficient tool be used? |• | |• | | |5. |Can stops be used? |• | |• | | |6. |Is the tool being operated at the most efficient feeds and speeds? |• | |• | | |7. Should a power tool be employed? • | |• | |’—‘| | | | | | | | |Therblig Analysis Checklist – Page 1 of 2 | Search 1. Are articles property identified? 2. Perhaps labels or color could be utilized? 3. Can transparent containers be used? 4. Will a better layout of the workstation eliminate searching? 5. Is proper lighting being used? 6. Can tools and parts be pre-positioned? Select — 1. Are common parts interchangeable? 2. Can tools be standardized? . Are parts and materials stored in the same bin? 4. Can parts be pre-positioned in a rack or tray? Position 1. Can such devices as a guide, funnel, bushing, stop, swinging bracket, locating pin, recess, key, pilot, or chamfer be used? 2. Can tolerances be changed? 3. Can the hole be counterbored or countersunk? 4. Can a template be used? 5. Can the elimination of burrs decrease the problem of positioning? 6. Can the article be pointed to act as a pilot? Inspect 1. Can inspection be eliminated or combined with another operation or therblig? 2. Can multiple gages or tests be used? 3.

Will inspection time be reduced by increasing the illumination? 4. Are the articles being inspected at the correct distance from the worker’s eyes? ___ 5. Will a grazing light accentuate defects and facilitate inspection? 6. Would an electric eye be useful? 7. Does the volume justify automatic electronic inspection? 8. Would a magnifying glass facilitate the inspection of small parts? 9. Is the best inspection method being used? 6. Has consideration been given to polarized light, template gages, sound tests, performance tests, and so on? Rest to Overcome Fatigue 1. Is the best order-of-muscles classification being used? . Are temperature, humidity, ventilation, noise, light, and other working conditions satisfactory? 3. Are benches of the proper height? 4. Can the operator alternately sit and stand while performing work? 5. Does the operator have a comfortable chair of the right height? 6. Are mechanical means being used for heavy loads? 7. Is the operator aware of his or her average intake requirements in calories per day? Hold 1. Can a mechanical jig, such as a vise, pin, hook, rack, clip, or vacuum, be used? 2. Can friction be used? 3. Can a magnetic device be used? 4. Should a twin holding fixture be used? Yes No | |• |• | |• | | |• |• | |• |• | |• |• | | |• | |Yes |No | |• |• | |• |• | |• |• | | |• | |Yes |No | |• |• | |• |• | |• |• | |• |• | |• |• | |• |• | |Yes |No | |• |• | |• |• | |· |· | |• |• | |• |• | |• |• | |• |• | |• |• | |• |• | |• |• | |Yes |No | |• |• | |• |• | |• |• | |• |• | |• |• | |• |• | |• |• | |Yes |No | |• |• | |• |• | |• |• | |• |• | Therblig Analysis Checklist – Page 2 of 2

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