question about wet stone grinder

[swervncarz]

I pick up this Delta universal wet/dry grinder for real cheap at a yard sale. The wet stone is cracked, 4 cracks, it looks perfectly quartered. I have never seen the stones like this...is there a reason for it to be cracked like this? Out is it just broken? It looks too evenly split makes me think there's a purpose but any ones that I've seen in the post are solid

[oldgoaly]

does it turn very slow?
I would take it off if it doesn't "ring" toss it!  I haven't seen a stone/ wheel blow up, but I have found cracks "before" I used a old grind stone with the ring test.

[Aunt Phil]

Might be the quality of the picture, but it looks to me like some Weldibater tried to Weldd the hub.
Looks like the heat popped the stone apart.
Game Over

[rusty]

The big stone only turns 100 rpm or so, the worst it will do is fall into the bucket...

Replacements are in the $45 area....

Best guess for 4 equal spaced cracks? Fell over on it's side, or as Phil says, some klutz cooked it welding the shaft.....
(Soggy water filled stone doesn't appreciate sudden heat, something about 30 cubic feet of steam trapped in 1 cubic inch of rock;   just doesn't end well....)

PS: One bad feature about this design in general, the fast stone is at right angles to the big stone, if it is even slightly out of balance, it vibrates the big stone sideways making it impossible to put a good edge on anything...

[swervncarz]

Thanks for the replies

[Bill Houghton]

Replace it.  EReplacement Parts lists most of the parts (though not the wheel), see http://www.ereplacementparts.com/delta-23700-type-grinder-parts-c-3275_3621_3654.html.  Manual can be found at http://www.manualslib.com/manual/47427/Delta-23-700.html.  Grizzly has a similar grinder - don't know if their wheel (http://www.grizzly.com/products/10-Stone-For-G1036/H2432) fits, but I bet their customer service people could tell you.

I own one of these, and use it a lot.  You have to deglaze the wheel fairly frequently; I use one of those little diamond dressers on a short handle.  I got mine from Lee Valley (http://www.leevalley.com/US/Wood/page.aspx?p=55075&cat=1,43072,43080&ap=1), but other people offer them too.  But, with this maintenance step, the grinder works well, and the finish you can get is fantastic, smooth and mirror-shiny.  It's not as fast as a high-speed dry grinder, but it doesn't burn the tool.

I bought Tormek's angle setter (http://www.tormek.com/en/accessories/wm200/index.php) to help me in setting the toolrest.  This works pretty well, although it's not quite precise; I have to set it to show a degree less (24 degrees when I want 25) in order to get 25 degrees of bevel, for instance.

[oldtools]

Wow! Bill, you are a wealth of information... saved your links...  Thank you...