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India stone grinding jig

jcdammeyer said:
I remember the Sears gas station at Hillside.
Anyway. This thread is very interesting.

Please explain to someone who hasn't got a clue how you will flatten the stone once it's held in place.

And once the stone is flat where is it useful other than say sharpening a hand planer blade.
Click to expand...
Another good vid.

 
jorogi said:
Another good vid.

Click to expand...

Doesn't require a surface grinder.

But doesn't necessarily leave the stones with "flattened" surface where the points of every abrasive have been cut off leaving abrasive pieces with a flat face.

I did find another clamping method for using surface grinder... also quite clever

 
Oh I must note, this fellow says he doesn't use a mask, he is comfortable using just a vacuum.

This is your reminder than the vacuum works by moving low volumes of air at high velocities so it can move up large particles. Dust capture works in the opposite manner. It moves massive volumes of air at lower velocities so it can capture more small particles of the size you cannot see.

It is the particles that you cannot see that kill people. Note also that the vacuum does not even catch all the larger particles and you can see the smear of missed particles adhering to the fellows end plate.

Be smart, use a mask when grinding stones, and a proper high volume dust extractor system
 
Megar arc 5040dd said:
I am assuming that using a surface grinder works differently than using something like this https://www.leevalley.com/en-ca/sho...67-truing-stone-for-water-stones?item=08M1530 or wet dry paper on a surface plate? That is how I flatten my sharpening stones for my wood working hand tools.
Click to expand...
The surface grinder with a diamond wheel does two things. Not only does it provide a precision ground "flat" surface, but it also removes the points from the abrasive bits held within the matrices.

It is my understanding that other lesser abrasives cant do this laving the stones with too much bite into flats and grind them instead of floating over them
 
TorontoBuilder said:
The surface grinder with a diamond wheel does two things. Not only does it provide a precision ground "flat" surface, but it also removes the points from the abrasive bits held within the matrices.

It is my understanding that other lesser abrasives cant do this laving the stones with too much bite into flats and grind them instead of floating over them
Click to expand...
This might be a stupid question but would just using a much finer grit stone do the same thing as far as having less bite? My only experience is with using stones for sharpening so I am trying to rap my head around the differences. I guess I should also ask are these stones different from sharpening stones? I mean before you grind them on the surface grinder.
 
TorontoBuilder said:
The surface grinder with a diamond wheel does two things. Not only does it provide a precision ground "flat" surface, but it also removes the points from the abrasive bits held within the matrices.

It is my understanding that other lesser abrasives cant do this laving the stones with too much bite into flats and grind them instead of floating over them
Click to expand...
Flat Ground (or Ground Flat) Stones are used around machines for removing raised burrs & dings.

The “flattened” stones are used for sharpening chisels, plane blades, etc. so that the blades have straight, flat edges (and not slightly curved and/or concave/convex edges).

Two different processes to achieve two different results for two different uses.
 
My friend went through making precision flat stones on his surface grinder like Renzetti etal. He said another variable that needs attention is the stone itself. He was using the correct diamond or CBN wheel (I cant recall which) and proper setup & DOC & feed etc. But many of the stones were not responding as well despite having the same nominal grit & AO makeup. I believe it was a Norton stone that worked in the end & possibly he got that info from Renzetti vid, not sure. The way he described it is the diamond is cleaving the grains to some degree, but mostly its about dislodging them from the binder matrix in a very controlled manner & that's what apparently varies by supplier. I have a set & they are a joy to use. Having said that, I wish there was someone local that I could drop my smaller stones for tuneup. They see the most use & get out of whack over time. I'm using cheapo Chinese diamond plate to flatten which works but not that great. I can feel the diamonds getting dull quite rapidly. (AliExpress specials).
 
ChazzC said:
Flat Ground (or Ground Flat) Stones are used around machines for removing raised burrs & dings.

The “flattened” stones are used for sharpening chisels, plane blades, etc. so that the blades have straight, flat edges (and not slightly curved and/or concave/convex edges).

Two different processes to achieve two different results for two different uses.
Click to expand...
Yes, but the flattened stones for sharpening chisels etc dont have the abrasives on the flat surface plane ground flat. The process merely strips out high abrasive particles
 
ChazzC said:
The “flattened” stones are used for sharpening chisels, plane blades, etc. so that the blades have straight, flat edges (and not slightly curved and/or concave/convex edges).
Click to expand...
To true & condition my water stones which re reserved for sharpening blades & tools etc. I'm real happy with this flattening stone.

www.sharpeningsupplies.com

Double-Time Flattening Stone

The First Double-Sided Dual Grit Flattening Stone When we set out to create the ultimate flattening stone, our objectives were to create the best flattening stone possible, while still keeping it affordable. The Double-Time Flattening Stone is a Sharpening Supplies exclusive, the quality and...
www.sharpeningsupplies.com www.sharpeningsupplies.com
 
PeterT said:
My friend went through making precision flat stones on his surface grinder like Renzetti etal. He said another variable that needs attention is the stone itself. He was using the correct diamond or CBN wheel (I cant recall which) and proper setup & DOC & feed etc. But many of the stones were not responding as well despite having the same nominal grit & AO makeup. I believe it was a Norton stone that worked in the end & possibly he got that info from Renzetti vid, not sure. The way he described it is the diamond is cleaving the grains to some degree, but mostly its about dislodging them from the binder matrix in a very controlled manner & that's what apparently varies by supplier. I have a set & they are a joy to use. Having said that, I wish there was someone local that I could drop my smaller stones for tuneup. They see the most use & get out of whack over time. I'm using cheapo Chinese diamond plate to flatten which works but not that great. I can feel the diamonds getting dull quite rapidly. (AliExpress specials).
Click to expand...
Less cleaving more cutting minutely without popping particles from the matrix
 
TorontoBuilder said:
Yes, but the flattened stones for sharpening chisels etc dont have the abrasives on the flat surface plane ground flat. The process merely strips out high abrasive particles
Click to expand...

I am no expert on this stuff but recall reading about this. I think its a combination of cleaving & particle dislodging? Paraphrasing rusty memory but was something to the effect: if the grinder successfully cleaved across all the grains, you have 'flat' but essentially minimal cutting tooth or particle trough (orange line). I guess you want something like (green) line but how to achieve that seems like a dance of grinding wheel grit & stone grit & how the stone particles hang together in the matrix? Look forward to your own findings. All I know is when you rub them together, they skate like nothing you have ever felt stones do before

1733954447200.png
 
Susquatch said:
A related question - how do you balance and true a diamond wheel?
Click to expand...

Best instructions I've found I linked to above ..... but you're going to have to suffer through a video lol. Basically you manual balance it statically on a hub as best you cab get it, torque it down on a hub, use a dressing stick to remove resin, then grind steel (absorbs diamond) until the wheel is cutting all the way around.
 
Mcgyver said:
Best instructions I've found I linked to above ..... but you're going to have to suffer through a video lol. Basically you manual balance it statically on a hub as best you cab get it, torque it down on a hub, use a dressing stick to remove resin, then grind steel (absorbs diamond) until the wheel is cutting all the way around.
Click to expand...

I watched the renzetti video in your post 13, but passed on the other two (bad decision). Gunna be an interesting adventure.

I've only ever used a stone as is to remove proud nicks and high spots. I have two stones I have dedicated to that purpose. They are not used for anything else. I like the idea of being able to dress them. I also like the idea of being able to sharpen a few tools with a diamond wheel - nothing fancy though. Easier for me to just buy new as needed.
 
Susquatch said:
Hey TB, where do you get your diamond wheels and which ones are they?

A related question - how do you balance and true a diamond wheel?
Click to expand...

I bought most of mine from a CNC grinding shop in Cambridge when the two brothers who owned it retired. They only had the very best diamond wheels. I scored another good diamond wheel from a flipper in scarborough, and I bought one cheap diamond wheel off of aliexpress during one of their sales. I wanted to do a comparison between the very expensive and very cheap and see if there was a difference.

That and I figured I'd use the cheap diamond wheel for grinding stones.

Mcgyver said:
Best instructions I've found I linked to above ..... but you're going to have to suffer through a video lol. Basically you manual balance it statically on a hub as best you cab get it, torque it down on a hub, use a dressing stick to remove resin, then grind steel (absorbs diamond) until the wheel is cutting all the way around.
Click to expand...

This is basically how I dressed my first wheel when I used it. However, because it was used at cnc shop and had quality design it I could not see any issues before I even started trying to dress it. I dont expect to be so lucky with the cheap diamond wheel, so I've been looking for a manual brake dresser
 
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