Membenang skru

today is my 2nd amalan kejuruteraan workshop which is screw threading (membenang skru). We're asked to cut the specimen in certain length and need to make a hole using a grill for the nut. then, we are asked to thread the bolt and nut.threading screw was fun cuz it really need some skill to make it 90 degree. ere is my work~~
boltnut
the combination