Garage power is run from the bungalow consumer unit and has its own 15amp wire type fuse separate from all other bungalow wired fused circuits. In the garage the cable from the 15amp fuse powers a Wickes mcb consumer unit type that has trip switches. The garage 13amp is a ring main on a 32amp mcb fuse. Now I need to cut some York stone using a 16amp disc cutter if the cutter is too high in amps would the 32amp fuse trip so protecting the house fuse?

bob, January 2013

if you do that you may find the high start up torgue will trip the 15 mcb put the proper fuse in the plug and the mcb will look after you,and if you do get your cu changed,then the rcd will look after you

mm, February 2013

The answer is rather obvious your house feed to the garage is the old wire type 15 amp fuse. that is the weakest link in the circuit you are going to draw the power from. Your 32 amp MCB will quite happilly let you totally overload the garage feed cable if it wasn't for the 15 amp fuse.
Change the 32 amp MCB for a 15 amp and change the wire fuse for a 15 amp MCB if you want your feed cable and your garage ring main to be best protected. But even that will not allow you to exceed the safe max loading of 15 amps

GB in Wales, January 2013