Makita BTP140Z Owners Manual - Page 8

Impact driver operation When driving wood screws or bolts. set the action mode changing lever to the mark. The adjusting ring can be placed at any position. Screwdriving Hold the tool firmly and place the point of the driver bit in the screw head. Apply forward pressure to the tool to the extent that the bit will not slip off the screw and turn the tool on to start operation. 007411 Fastening torque Proper fastening torque 007319 High tensile bolt N m (ft lbs) 120 (87) 100 (72) M12(1/2") (M12) (1/2") 80 M10(3/8") (58) 60 (43) (M10) (3/8") 40 M8(5/16") (29) (M8) 20 (5/16") (14) 0 0 1.0 2.0 3.0 Fastening time (S) Tightening bolts The proper fastening torque may differ depending upon the kind or size of the screw/bolt, the material of the workpiece to be fastened, etc. The relation between fastening torque and fastening time is shown in the figures. 007317 Standard bolt N m (ft lbs) 120 (87) Fastening torque Proper fastening torque 100 M14(9/16") (72) 80 (58) M12(1/2") (M14) 60 (9/16") (43) 40 (29) M10(3/8") (M12) (1/2") 20 (14) M8(5/16") (M10) (3/8") (M8) 0 (5/16") 0 1.0 2.0 3.0 Fastening time (S) NOTE: • Use the proper bit for the head of the screw/bolt that you wish to use. • When fastening screw M8 or smaller, carefully adjust pressure on the switch trigger so that the screw is not damaged. • Hold the tool pointed straight at the screw. • If you tighten the screw for a time longer than shown in the figures, the screw or the point of the driver bit may be overstressed, stripped, damaged, etc. Before starting your job, always perform a test operation to determine the proper fastening time for your screw. CAUTION: • If the tool is operated continuously until the battery cartridge has discharged, allow the tool to rest for 15 minutes before proceeding with a fresh battery. The fastening torque is affected by a wide variety of factors including the following. After fastening, always check the torque with a torque wrench. 1. When the battery cartridge is discharged almost completely, voltage will drop and the fastening torque will be reduced. 2. Driver bit or socket bit Failure to use the correct size driver bit or socket bit will cause a reduction in the fastening torque. 3. Bolt • Even though the torque coefficient and the class of bolt are the same, the proper fastening torque will differ according to the diameter of bolt. • Even though the diameters of bolts are the same, the proper fastening torque will differ according to the torque coefficient, the class of bolt and the bolt length. 8