A little demo of the American Mutt bench stone.

Thanks for the tips!

i just left the stone in a plastic container when i was finished, i didnt know if the water would drain out of the stone at some point or not or just evaporate. or should i be keeping the stone in water all the time?
 
It'll evaporate out slowly. Being a ceramic bond, leaving them immersed doesn't do them any harm, but it's not necessary either.
 
bucketstove said:
Hi,
Huh?
The quantification would be very qualitative for the most part
and it wouldn't take long,
its just like a regular sharpening except on a scale
and you get a number you can relate to with a scale of your own :)

a little is like a pinch of salt
stone surface looks basically unchanged
blade rubbing on stone feels slightly more scratchy
scratch pattern left on blade is very harsh and linear
touch/dab finger to stone and it picks up grains of sand
rub finger on glass to check that it scratch the glass

a lot is like a layer of mud/frosting
stone surface changes color, looks coated in mud,
blade rubbing on stone feels very smooth since its riding on mud/slurry
scratch pattern left on blade is very smooth and random /shot-peened,
touch/dab finger to stone and its mud sticky, you get mud on your finger


I've done done quite a bit of searching on "P grade bond hardness"
and couldn't find numbers I could relate to more than "its hard" :)
to really make sense of it i'd have to get a p-grade wheel

The manufacturer ought to have an idea of the pressures required to break the bond
if they used a grade-tester , which are supposedly used for quality control
... but they could be simply grading by volume of binder to abrasive ...
it would be interesting to know :)
Thanks
Click to expand...

42 is nicer than I would be, it is a 7$ stone, and those are a bunch of needless questions. Buy one and try it out, I would chip in a couple bucks just to shut you up.
Have a day, Russ
 
bucketstove--I asked with the UAMA and they don't have any standards pertaining to bond hardness. I posed the question regarding bond hardness standardization to my manufacturing partner and his answer was as follows:

Grades are actually dictated by product density. That density is determined by a simple mass/volume calculation. Since the bonds used are proprietary to manufacturers, each manufacturer has a different scale used and the letter hardness associated with the grade is therefore not consistent between manufacturers. Typically, based upon an average within the industry, a product of the same structure, but one letter grade harder is about 6% denser. Of course, hardness in itself is relative. A product containing less bond but manufactured with increased pressure may be as hard as one that contains more bond and pressed at a normal pressure. They will grind very differently though since the bond to grain ratio will be different. I hope that helps.
Click to expand...
 
mycough said:
42 is nicer than I would be, it is a 7$ stone, and those are a bunch of needless questions. Buy one and try it out, I would chip in a couple bucks just to shut you up.
Have a day, Russ
Click to expand...

Amen. I'd chip in too. Nothing said by this guy mirrored my experience at all anyway.
 
You must log in or register to reply here.
Back
Top