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Purgatory IronWorks: 1st Reply to Sharpe...

Questions answered.

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15 Comments

Current View: 15 / Show all Comments

GB! : LVL 65: VP 5: said:

GB!

7 votes NegativePositive

270 days 15 hours ago...

So was that mrs purgatory?

The tag Sexual (non-nudity) is a bit over the top though ;-)

exploder : LVL 47: VP 5: said:

exploder

4 votes NegativePositive

270 days 15 hours ago...

Hey, thanks for the support Purgatory. I fully agree that there is very little practical difference between oil and water, and probably nearly NONE at typical hand sharpening speeds. I personally prefer water for its cleanliness, and that`s probably my biggest choosing point.

As for the blade angles: my good kitchen knife has an area less than 1/64" wide of `barn roof`. Maybe 1/100" even. Very small, and probably about 70° range. Behind that TINY edge is total 30° - 40° ballpark for another 1/32", then goes to the rest of the blade at what maybe 5° total.

So the bulk of the blade is just as thin as ever for easy parting of materials, but the final edge has better support for hitting bone or a ceramic plate (yeah I sin sometimes, carefully).

I know that my knife won`t do what yours does to paper, but will fare better tossed into the sink with the cutlery, plates, and cups. The damage is less deep, and mostly just requires a very light touchup because it`s much harder to fold /smear / chip over the last tiny edge. Meanwhile it still falls through a tomato, or a roast being cut into steaks, or a turnip (well that`s a push for any knife).

I think I will take your advice though for my filleting knife, which has always sucked very badly, in spite of my best efforts so far. It had a bad start, and I think the full narrow angle will be WAY better.

Cheers mate.

edit: PS, Hockey skates & zambonies, fresh sheared sheet metal, drill bits, carbide metal cutting saws, almost all milling and machining, steel or otherwise. These are all edges where sharp is critical, and happens at or very near 90° on the edges. You saw the sad vid of the goalies throat w/ spurting blood from a skate? 90°, could be less if that was better, but apparently it`s not. Wood turning uses ones called scrapers, and the sharpness of the near 90° edge is critical. Lots of things use critically sharp edges up to 90°.

Not saying it`s the right thing on a knife, just that 90° can certainly be sharp.

Zodd_25 : LVL 11: VP 2: said:

Zodd_25

0 votes NegativePositive

270 days 15 hours ago...

great vid, thanks for the response, on one of your vids where you talked about samurai swords someone posted a very good vid, if you hadn`t checked it out it, I`d recommend checking it out, talks about the master sword smiths etc.

also lol on the tag, MATURE: SEXUAL (non nudity)

bigjimtruckin : LVL 20: VP 2.9: said:

bigjimtruckin

1 votes NegativePositive

270 days 14 hours ago...

I look forward to your videos being posted, very interesting and informative. The fact that you take this time and the time to even answer peoples questions is astounding. Keep up the good work. Gonna go check your sight to see if you have a donation`s area. You deserve it for taking the time to do these things for spiked.

purgatoryironworks : LVL 11: VP 2: said:

purgatoryironworks

13 votes NegativePositive

270 days 14 hours ago...

Mrs. Purgatory? hey man, dont you know that blackmsiths are natural born swingers?

Metallicus : LVL 42: VP 5: said:

Metallicus

0 votes NegativePositive

270 days 13 hours ago...

This is awesome! Thank you for backing me up on the jeans sharpening technic.

Heres a question that im sure a lot of people ask, what is your, if any, everyday carry knife?

whammy : LVL 18: VP 2.7: said:

whammy

0 votes NegativePositive

270 days 13 hours ago...

What about a double-bevel, as in, You do one bevel at 15 degrees, than do a secondary at 25 or 30? Thats how I was taught to sharpen my knives. Is there any gain in this?

exploder : LVL 47: VP 5: said:

exploder

2 votes NegativePositive

270 days 11 hours ago...

^ @ whammy : sounds like what I`m talking about. The 15° x 2 sides = 30° for the main bevel, and the second bevel, by your angles is 50° - 60°. I`m eyeballing my angles, and come up with 70° - 80° on the last passes, but it`s the same idea. I understand the gain to be better durability against edge damage. Not so much for holding edge, but good against impact to resist chipping / folding over.

Of note, when I`m on the second bevel, it`s a light and carefull touch, on a good smooth stone. Otherwise it will just get dulled with the angle so steep.

contradoublebassman : LVL 35: VP 4.3: said:

contradoublebassman

0 votes NegativePositive

270 days 9 hours ago...

5/5 Thanks man; really helps me out. Even though I`m a music guy and just an amateur woodturner.

tha_help : LVL 39: VP 4.7: said:

tha_help

2 votes NegativePositive

270 days 9 hours ago...

Exploder,
Unfortunately you are wrong when it comes to Hockey skates. The skate is sharpened down the center of the blade with a round stone creating two edges. True that it is closer to 90° than 15°.
My point was that a hockey skate does not have a true flat surface. A well sharpened skate actually glides on two seperate edges instead of the whole surface of the blade.

grumpybear : LVL 32: VP 4.1: said:

grumpybear

0 votes NegativePositive

270 days 9 hours ago...

i couldnt take my eyes off of the mic, were u flipping us off? :O i missed everything u said the first time, so i rewatched it..and i missed it all again cuz your middle finger is so hypnotic x.x

Pentiki : LVL 21: VP 3: said:

Pentiki

1 votes NegativePositive

270 days 8 hours ago...

i don`t mean to be dis-respectful, i`m totally entranced by any sort of learning experience and this is no exception. What i have found tho is that the single channel mic audio (left channel) in the stereo audio landscape (your opening music seems to be stereo for example) is a touch distracting. If nobody has mentioned it before tho, it probably means im the only one distracted. Anyway, awesome stuff you are doing. Your format is very informative otherwise.

MARINE255 : LVL 35: VP 4.3: said:

MARINE255

1 votes NegativePositive

270 days 8 hours ago...

@ Exploder
When I first heard 90° edge I was also puzzled until I heard you are talking about multiple beveling. The only benefit to making multiple bevels I can see is like you and whammy said damage resistance. After some serious chopping or impact damage the sharp edge of the first bevel would be gone or seriously notched though but I think sharpening it that way would give the knife better longevity through the supporting tiers of bevels.

I tried to make some supporting ASCII art to show what I was talking about but this site kept messing it up >.<

cheeses christ : LVL 27: VP 3.6: said:

cheeses christ

0 votes NegativePositive

270 days 7 hours ago...

Am i the only one who has to turn the volume all the way up to hear him speak?

Nice videos. At least your educating people.

exploder : LVL 47: VP 5: said:

exploder

0 votes NegativePositive

270 days 7 hours ago...

^ @ MARINE255, yeah, damage resistance. Still doesn`t stay sharper longer much that I can tell. But if you think how much longer that last thinnest part of the fine edge is if the angle is say 30° all the way to the tip...

At 15° either side (total 30° V), from where the blade is 1/50" thick, the distance out to the tip is 1/27". Almost twice as long as it is wide.

At 30° either side (total 60° V), the distance to the tip is only 1/58". IE just barely longer than it is wide.

When you consider how thin the blade is out there in that last edge, it is vulnerable, and substantially moreso when it`s not backed by a solid angle of steel.

Wouldn`t want to shave with a double bevel, but when you accidentally hit the staples with your full time pocket wife, you`ll be glad you had to push a bit harder to cut normally, when you can easily sharpen out the dull, instead of grinding out a chip. I just think of what happens to even my good quality Olfa blades, how the edges get chipped off (very long V, very hard steel). I don`t want my $75 Victorinox to be nearly that vulnerable, because it surely does catch serious hell now and then.

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