Recent posts

#1

Knife Sharpening / Re: Cletus Spuckler on knife s...

Last post by HaioPaio - Today at 09:13:59 PM

Thanks for sharing. You made my day.

#2

Wood Turning / Re: well done extensive Glenn ...

Last post by FIGO - Today at 05:58:18 PM

I am SUPER THANKFUL!

#3

Knife Sharpening / Cletus Spuckler on knife sharp...

Last post by kwakster - Today at 05:14:43 PM

Cletus is a cook and that's what he does.

The clip showcases the amazing things one can do to a knife edge with a pull-through "sharpener".

https://www.youtube.com/watch?v=UMBD1Hhgdzo

Maybe i should sell my Tormek and buy one of these ?

#4

Wood Turning / Re: Need a Nose job

Last post by FIGO - Today at 03:56:51 PM

Thank you.

#5

Knife Sharpening / Re: CATRA Lab Results: Knife G...

Last post by tgbto - Today at 09:10:19 AM

Results Oriented - Not Equipment Nor Protocol Specific

The report shows (with the caveat below) good Cutting Edge Retention ("CER") is not equipment dependent - good CER values was achieved with three different pieces of equipment. Also, KnifeGrinder's protocols are not the only way to achieve good CER. That's why on page 25, under Conclusions, I stated, "Experiment"!

The caveat is that guided sharpening (knife clamped + guide bar) achieved much higher CER values than those that did not (sharpeners PB, WK, OA, and KH). In KGA Variation #1 (page 14), half a degree angle made a noticeable difference to CER values.

I'm not sure I understand your report properly but if I do, I read that what you call "KGA Variation #1" brings CER from 399 to 391. But the standard deviation of your (small) samples are 46 and 10 respectively. So your 8mm (2%) CER variation is well within standard deviation, which is not what I'd call "noticeable".

Plus you changed the honing edge angle AND removed a step. So who is to say the difference is due to the change in angle ?

I posted somewhere else last week that I helped a commercial fisherman get his knives from around 265 BESS to around 95 BESS by deburring at .5 degree higher than the 15º angle.

You mean you had a set of similarly sharpened knives, some of which you honed for a given amount of time at 15dps, the others for the same amount of time at 15.5dps, and mean BESS was 265 on the first set and 95 on the second set ? I'm having a hard time believing that.

I guess what I'm saying is that to quantify the influence of .5dps difference in honing edge angle is in itself a very ambitious endeavor : your K09-K18 sample already already comes out of the factory with initial BESS readings from 125 to 170. And how many BESS readings did you take per knife ? BESS scores vary between the flat part and the curved part of the blade because the angle changes due to the operator's combination of pivoting and lifting in the curved area, close to the tip.
You would also have to make sure that all knives come out of the sharpening step with consistent sets of BESS readings, and randomize the order in which you take them over the honing wheel to factor out potential wear of said wheel over a significant set of knives. Along with many other precautions to make sure the operator doesn't know if they are honing @15 or 15.5 dps. This would prove very costly in time and money, but I don't see many other ways to quantify the effect of the .5dps difference.

If just a small process difference proves that hard to evaluate, then the influence of an entire process is orders of magnitude harder, and in the end I think one has to take even Wootz' litterature as a very interesting informed experiment but not a rock-hard scientific conclusion. The influence of the operator in itself is tremendous.

Again, the only conclusion I risk making based on your report is that I'd rather have my knives sharpened by you and your equipment than by your fellow sharpener and their equipment. And you can't increase the significance of your results by "bunching up" results of completely different experiments because you don't control the variations.

#6

Wood Turning / Re: Need a Nose job

Last post by RichColvin - Today at 04:14:06 AM

Use JS 6, 75 mm, hole A.  

https://sharpeninghandbook.info/WW-BowlGouge.html

#7

Knife Sharpening / Re: Goniometer - MASTER

Last post by RichColvin - Today at 04:11:26 AM

Nice work Perra!

#8

Wood Turning / Re: Need a Nose job

Last post by FIGO - Today at 12:18:51 AM

Photo attached

#9

Knife Sharpening / Re: Goniometer - MASTER

Last post by Perra - Yesterday at 11:18:16 PM

I've developed a laser goniometer which can be 3D printed.  It is available at https://www.sharpeninghandbook.info/Jigs-LaserGoniometer.html.

Hi Colvin
I have also made my own laser goni.
/Perra
https://youtu.be/5Q-qHsmYvjs?si=Aar2V8TqTOY-LLeF

#10

Wood Turning / Need a Nose job

Last post by FIGO - Yesterday at 08:03:46 PM

Hello!
I have squared off my bowl gouge nose. I am using a t8 with a 186r
hole A
protrusion 65
jig setting 3.

Attached shows my gouge on the right.
I'm trying to give it a fingernail grind like the one on the left...
Appreciate any advice to fix it in advance..