EFFECTS OF PILOT HOLE DIAMETER ON SCREW-DRIVING TORQUES IN MEDIUM DENSITY FIBERBOARD

Onder Tor
2019 Cerne  
HIGHLIGHTS The pilot-hole diameter needs to be chosen carefully driving screws into MDF. Too much torque applied in the MDF will cause stripping problem. The large pilot-hole diameter such as 3.2 mm needs to be preferred than the narrower ones in edge of MDF in order not to cause splitting. ABSTRACT This study investigated the effects of pilot-hole diameter in medium density fiberboard (MDF) on the characterization of screw-driving torques. The factors investigated were the embedded screw
more » ... mbedded screw orientation and pilot hole diameter. Based on the curves obtained from screw-driving process, the measurements of the seating torque (SET) and stripping torque (STT) were obtained. The results of statistical analysis indicated that the SET and STT values in MDF were significantly affected by the pilot hole diameter. In the case of driving screws into the side of MDF material, the mean SET ranged from 0.37 to 1.23 N•m and STT values ranged from 1.18 to 2.68 N•m whereas for the face specimens, the mean SET ranged from 0.57 to 1.56 N•m and STT values ranged from 2.89 to 5.41 N•m. v.25 n.1 2019 55 CERNE TOR.
doi:10.1590/01047760201925012608 fatcat:biqqjhdpxfaj3pdlntocctbcem