I am going to add some personal comments-
Get a grinder with a standard threaded arbor (SAE threads).
Do not buy a 4" grinder if you can get a 4.5" grinder.
A 5" grinder is better yet.
A paddle switch is safer than a slide switch.
Why?
A 4.5" or 5" grinder with a metric thread is an exercise in frustration. Few,
actually very few, sources stock wire brushes and other accessories for these
arbors. They will grind fine, but that is all. I usually leave a wire wheel on
one of my grinders at all times. (I learned about the metric threads when I
bought a Grizzly 5" grinder.)
There are less tools and accessories available for a 4" grinder and disks are a
bit less common. They have a smaller arbor diameter. (Learned all that after I
owned a Makita 4" grinder.)
A 5" grinder (with standard arbor) will use either 4.5" or 5" disks and cut
faster with a 5" disk. Sears, Dewalt and sometimes Harbor Freight make
interesting 5" grinders. Some are large like a 7" grinder, some are small like
a 4.5" grinder. (Love my Harbor Freight 5" grinders with paddle switch.)
A paddle switch tool is turned off when you loosen your grip. A slide switch is
often not. Paddles are nicer.
In summary, the small grinders are the most useful tool I use. Can't count how
many I own. Even the best ones do break down. (I have a non-operational
late-model Milwaukee.)
Mark V.S. in Austin, TX
-----Original Message-----
From: Randall Young [mailto:ryoung@navcomtech.com]
I use both on occasion, and I have to say I disagree with Tim. The big
advantages of the air grinder are that it's small and light, hence easier to
maneuver in tight quarters. But the HF 4" grinder with a cutoff blade will
cut faster.
> Sears right now has a deal going where I can get a 4.5" craftsman grinder
> kit with a few wheels and stuff for like $45. Is this something I should
> look at? Someone said the craftsman one lasted forever (which I agree
> with, every other craftsman tool I own is indestructable - my drill press
> was made by them and is over 50 years old, was my grandfather's, and it
> runs like new!),
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