Panasonic EY7202 EY7202 User Guide - Page 10

Clutch setting and operating impact force Impact Power Mode Display Soft Medium Hard H Soft Medium Medium M Soft Soft Soft S Important remarks when using the digital clutch and one shot impact functions The digital clutch setting could be used only as a guideline. The suitable setting will vary depending on the hardness of the material, the force being applied to the tool, and the type of screw. Uneven material hardness could result in less-tightening or over-tightening depending on the position on the material. If the battery pack capacity is low, the driver might not fully tighten the screws. Usage When driving screws into wood, use the screws of less than 90 mm long and avoid knots of wood materials. Be sure to set the impact power mode and digital clutch to match the material and screws being used. When selecting the digital clutch settings, start from low to high stage while checking the setting (on a scrap piece of the material) to determine the best setting. Too high setting could result in over-tightening of the screws. Depress the trigger switch fully when using the digital clutch and/or one-shot impact function during one period of operation. Using low speed by trigger switch could result in a discrepancy in work results. When using the digital clutch, depress the trigger switch fully until the digital clutch operates. Do not release the switch until the rotation stops. Releasing the switch to stop rotation before finishing tightening a screw could result in not being fully tightened. (If this happens, start from the beginning of fastening.) Setting value Applications not recommended for these functions Tightening screws into easily breakable materials, such as thin plastics. Tightening screws into lightweight steel sheet which thickness is 0.8 mm or less. Tightening TEKS screws into soft surface materials, such as interior finishing materials. Reason: The impact function is a mechanical sideway impact. The tightening torque increases instantly step by step when the hammer impacts. Therefore, fastening torque of impact driver is not generally increased as a drill driver. (The accuracy also varies depending on the material.) Impact torque curve Tightening torque (load) Drill driver torque increase. Impact torque curve Tightening time Number of impacts To control the tightening torque for screws and bolts during factory manufacturing and assembly. Reason: The digital clutch uses a sensor and microcomputer to deduce the load from the number of motor rotation between impacts and then stop the rotation when the load reaches to the set clutch load. To deduce this load requires at least 4 or 5 impacts, This is not suitable for materials which requires a low tightening load, as impact may not occur 4 or 5 times. The digital clutch cannot operate accurately when the connecting surface material is soft and the fixing base sheet is hard. Example applications for which it cannot be used; Attaching gypsum board on hard wood. Tightening screws with different lengths, diameters, thread pitches, etc., even if they are the same type of screw. - 10 -