Hollow grinding theory

[T. Hendrickson]

If the tangent is not at, or very near the edge on a hollow gring, doesn't that cancel out the whole theory of the hollow being stronger than the flat....?

Thats more of a wive's tale; it doesn't hold true in real life. Ed fowler performed a series of tests that proved flat grinds are in fact stronger.

 

[Fellhoelter]

Wonderful, I'm a flat grinder.....

 

[butcher_block]

and i think that slack belt (convexed ) are the strongest
but truly its how thick the steel is behind the edge
a few .001 before sharpening can make a big difference

 

[Matthew Gregory]

but truly its how thick the steel is behind the edge
a few .001 before sharpening can make a big difference

I agree! Each type of grind has it's applications. Strength is not always the most important factor. A lawnmower blade is strong as hell, but I sure don't want to shave with one!

 

[Lucky Bob]

Oh boy... Hollow grinding being stronger... I've never heard that one before. If I feel like taking a more extensive break from finals later, I'll do up some diagrams and explanations from an engineer(ing student)'s perspective.

 

[T. Hendrickson]

Oh boy... Hollow grinding being stronger... I've never heard that one before. If I feel like taking a more extensive break from finals later, I'll do up some diagrams and explanations from an engineer(ing student)'s perspective.

Don't bother, it's not really that complicated. There's simply less material in the blade, so it's not as strong.

 

[Fellhoelter]

Oh boy... Hollow grinding being stronger... I've never heard that one before. If I feel like taking a more extensive break from finals later, I'll do up some diagrams and explanations from an engineer(ing student)'s perspective.

Really?
I hear it all the time, though I argue it away from an engineers perspective.

 

[James_Terrio]

Really?
I hear it all the time, though I argue it away from an engineers perspective.

Never heard that before. Maybe it stems from someone comparing a hollow-ground blade to an I-beam. (Quite a stretch, but I'm thinking of the sort-of-similar cross-section.) Of course an I-beam is many times stronger than a flat plate, because it's mighty hard to bend or break almost anything across it's widest dimension (the top and bottom of the beam), but I don't see how that would relate at all to a blade. Sounds likes utter nonsense to me.