??????????????????????????? ??????????????????????????? (Drawn-cup needle roller bearing) ???????????????????????????????????????????????????????????????????????????????????????????????????????????????? ?????????? ISO ????????????????????????????? 2.5 ???????????????????????????????????????????????????????????????????
ลักษณะการใช้งานตลับลูกปืนเม็ดเข็มดรอว์นคัพ
??????????????????????????? ??????????????????????????? (Drawn-cup needle roller bearing) ???????????????????????????????????????????????????????????????????????????????????????????????????????????????? ?????????? ISO ????????????????????????????? 2.5 ???????????????????????????????????????????????????????????????????
คุณสมบัติและวิธีการใช้กำยาน
????? ????????? ????? ????????????????????????????????? ???????????????????????????????? ??????????? (????????) ????????????????????? ???????????????????????????? ????????????? ???????????????? 1 ??? ?????????????????????? ?????????????????????????? ??? 1 ???????????????? 15-20 ???? ????????????????????????????????????????? ?????
เพราะเหตุใดพรีคาสท์คอนกรีตสำเร็จรูปถึงนิยมนำมาสร้างโกดัง โรงงาน
??????????????????????????????????????????????????????????? ????????????????????????????????????????????????????????????????????????????????????????????? ??????????????????????????????????????????????????????????????????????????? ????????????????????????????????????????????????????????????????????????????????????????????? ????????????
สปริงกด (Compression Spring)
??????? ?????????????????????? ??????????????? ??? ?????? ????? ????? ????? ??????? ???? ???????? ?????????????????????????????????????? ????? ?????? ????????? ??????????????????????????????????? ???????????????????????????????????????????????????????????????????????????????????????? ?????????????????? pitch ??? ????????????????