What's the difference between a M14 threaded spindle and a 22.2mm spindle? Is the 22.2 simply a nut that clamps onto the disk and threads onto a M14 spindle, or are the two entirely different systems?
Choice between these two (or a cheaper one as there are other 850W 22.2mm grinders), the first is a 850W single speed motor, with a 22.2mm spindle, the second is a variable speed an 1010W but listed as M14 spindle.
http://www.screwfix.com/p/titan-ttb281grd-4-angle-grinder-230-240v/93905
http://www.screwfix.com/p/titan-ttb602grd-1010w-5-angle-grinder-240v/3278f
Not looked at the individual specs but ah would think both would have M14 spindles. The 22.2mm refers to to bore in your discs. Both common but the 5" will be more useful if you source your discs from work!
Cheers, so they attach with some sort of top hat shaped nut?
What's the difference with 4.5" and 5" disks? Can't find any 5" cutting disk, so I presume it's only used for polishing/cleaning/sanding disks and 4.5" cutting disks work just as well on them?
yep.so they attach with some sort of top hat shaped nut?
You should be able to get a 4 1/2" Hitachi for that sort of money. Top angle grinder. E.g. http://www.toolstop.co.uk/hitachi-g12ss-115mm-4-1-2-angle-grinder-240v-p14511
You'll be able to use 4.5" discs on the 5" grinder but not the other way round obviously, unless you removed the guard! Not a good idea for your fingers tho! Variable speeds are useful for using polishing mops and the like.
Discs are commonly available for various materials in both sizes, the 1 and 1.6mm thick discs are especially useful as are the intermediates. If you don't need them urgently give me a shout,email in profile and I'll post you a wee selection of 5" discs.
What will you be using it for? Although there's only 1/2" difference in disc size the grinders are two different beasts. The 4 1/2" will be lighter and can almost be used one-handed, good for light jobs. The 5" will be a definite two-hander and better for heavier jobs like cutting or sustained grinding
Gone for the 5" version. The imediate job for it is cutting through the wishbones on the midget as one of the inner fulcrum pins has siezed, after that probably polishing the hull of my dinghy so the variable speed option will be usefull.
Gone for the 5" version ...{snip}...polishing the hull of my dinghy so the variable speed option will be usefull.
3000 RPM? That's WAY too fast for polishing (IMHO), and the thing would probably overheat like mad if you tried.
A dedicated polisher is the way to go (or elbow grease!)
(The 4.5" grinder is smaller & lighter than the 5", too so easier to get into awkward places.)
so they attach with some sort of top hat shaped nut?
That's correct, however the will the bore of disks will fit the top hat there can be variation in the size of the threaded spindle and this can be a problem if you use cup brushes etc. my cordless grinder can't be used with cup brushes because spindle size is smaller than standard.
Dangerous tool the angle grinder especially when used for cutting 😕
http://www.powertoolinstitute.com/pti_pages/safetyvideo_5-Angle-Grinder-youtube.asp