Generally those fuses are fine when they are chosen to blow out on wire short circuit and prevent wires. To dimension these glass tube fuses to protect electronic circuit on small over current or surge load is not easy.
Another issue is selectivity. The mill fuse should blow before plug fuse and plug fuse should blow before mains fuse. Two fuses near same melting current is a bad idea.
Pekka
Pekka,
I was merely suggesting that to prolong the life of the machine, the the op change the fuses to a value lower than those originally fitted.
It is cheaper to replace a blown fuse in the event of a fault than have to buy a new motor or pcb.
The manufacturers of these machines will fit protective fuses, albeit with values that are far too high...the number of machines that have come my way for repair have fuses that are far in excess and have not afforded any protection to the motor or electronics....
I did not make my recommendations on a whim, there is evidence from other forums, that members there have had the same recommendation from a major machine tool supplier....
At the end of the day, its no skin off my nose if the op does nothing..however, if I carry out repairs to a machine, I ensure that the equipment fuses are adequate and fit for purpose in order tomoffer any guarantee of repair.
Rant over....