Itsme,
Don't know what kind of machine you are using, but if it has coolant, make sure they will not get contaminated by coolant.
On my mill/drill, I use "AAP minature Din limit switches" which I get from Automation Direct here in the states, but feel sure they are available on your side of the pond. I get them for 12 USD ea.
I use one on the X, and one on the Y axis, for the Z axis, I use micro switches as they are out of the path of coolant.
for a fine precision, I am also using optical switches. All are setup as NC (and where necessary, are in series).
Hope this helps.
Art
AKA Country Bubba (Older Than Dirt)