K390 Delica SpyderEdge

[weeping minora]

On board myself to see Golden use more K390 in their line-up. Perhaps Spyderco don't want to compete with their Maxamet lightweights, but I'd buy more than a few Native 5 lightweights in K390. I hope BBS doesn't hold the torch in terms of Golden being gun-shy on releasing more K390...

[ZrowsN1s]

I too would like more US K390. I hope that Bento isn't the only place to get it.

Have you seen this video from notyouraverageedc on US K390 v Japanese K390?

No I haven't. Interesting take. Maybe Seki's just had more practice? All the more reason to get more US K390.

I was thinking about this this afternoon and it occurred to me that some of the differences she's seeing could be attributable to edge geometry. She's using a worksharp thing that is kinda like a Duckfoot sharpener. It sits at an angle and you free hand sharpen on it.

What we don't know is the starting edge geometry and current edge geometry of both knives. For example the Wharncliffe Delica could have started at 15 DPS and the Para3 at 20 DPS. If she sharpens both at 15 DPS they will both get sharp, but will have different edge geometries. A 20 DPS edge with a 15 DPS micro bevel, vs a straight 15DPS edge.

I'm not sure if that IS the issue, maybe she did a full reprofile on both, but it's a variable that needs to be accounted for. Blade geometry may not affect edge retention that much but edge angle does.

[weeping minora]

I too would like more US K390. I hope that Bento isn't the only place to get it.

Have you seen this video from notyouraverageedc on US K390 v Japanese K390?

No I haven't. Interesting take. Maybe Seki's just had more practice? All the more reason to get more US K390.

I was thinking about this this afternoon and it occurred to me that some of the differences she's seeing could be attributable to edge geometry. She's using a worksharp thing that is kinda like a Duckfoot sharpener. It sits at an angle and you free hand sharpen on it.

What we don't know is the starting edge geometry and current edge geometry of both knives. For example the Wharncliffe Delica could have started at 15 DPS and the Para3 at 20 DPS. If she sharpens both at 15 DPS they will both get sharp, but will have different edge geometries. A 20 DPS edge with a 15 DPS micro bevel, vs a straight 15DPS edge.

I'm not sure if that IS the issue, maybe she did a full reprofile on both, but it's a variable that needs to be accounted for. Blade geometry may not affect edge retention that much but edge angle does.

Pretty sure there have been at least a few reports out there on the HRC differences between Golden K390 in the exclusive Para2/3s being in the low 60s and the Seki line of K390 being in the mid 60s. I've heard or read claims as low as 61/62 from Golden, to as high as 66 from Seki (which was actually posted here on this forum being tested from a Delica; I believe within the HRC Database thread?). That 4 or 5 point difference in hardness is quite extreme and I believe tells more of the tale when it comes to the overall difference experienced in use.

Edit to add Delica 4 K390 HRC reference; page 9 from HRC Database thread:

I just got a Delica k390. The results were a bit surprising. It was poked twice, with the results of 66.4 and 66.5 HRC

[ZrowsN1s]

Pretty sure there have been at least a few reports out there on the HRC differences between Golden K390 in the exclusive Para2/3s being in the low 60s and the Seki line of K390 being in the mid 60s. I've heard or read claims as low as 61/62 from Golden, to as high as 66 from Seki (which was actually posted here on this forum being tested from a Delica; I believe within the HRC Database thread?). That 4 or 5 point difference in hardness is quite extreme and I believe tells more of the tale when it comes to the overall difference experienced in use.

Edit to add Delica 4 K390 HRC reference; page 9 from HRC Database thread:

I just got a Delica k390. The results were a bit surprising. It was poked twice, with the results of 66.4 and 66.5 HRC

I really hope the amateur tester community doesn't take offense, but the more I learn about HRC testing and what it takes to do so accurately the less I trust peoples numbers. But a 5 point difference in hardness would definitely make a difference.

[on_the_edge]

For those who may be so inclined, the SFO now has a few SE in stock. I have one OTW.

[weeping minora]

Pretty sure there have been at least a few reports out there on the HRC differences between Golden K390 in the exclusive Para2/3s being in the low 60s and the Seki line of K390 being in the mid 60s. I've heard or read claims as low as 61/62 from Golden, to as high as 66 from Seki (which was actually posted here on this forum being tested from a Delica; I believe within the HRC Database thread?). That 4 or 5 point difference in hardness is quite extreme and I believe tells more of the tale when it comes to the overall difference experienced in use.

Edit to add Delica 4 K390 HRC reference; page 9 from HRC Database thread:

I just got a Delica k390. The results were a bit surprising. It was poked twice, with the results of 66.4 and 66.5 HRC

I really hope the amateur tester community doesn't take offense, but the more I learn about HRC testing and what it takes to do so accurately the less I trust peoples numbers. But a 5 point difference in hardness would definitely make a difference.

I cannot confirm where the tests have been done, the equipment used, or by whom, but the numbers all show a pattern of K390 out of Golden in the lower 60s and Seki in the mid 60s. That'd be quite a call if everyone was bluffing the same numbers.

[Bill1170]

I too would like more US K390. I hope that Bento isn't the only place to get it.

Have you seen this video from notyouraverageedc on US K390 v Japanese K390?

No I haven't. Interesting take. Maybe Seki's just had more practice? All the more reason to get more US K390.

I was thinking about this this afternoon and it occurred to me that some of the differences she's seeing could be attributable to edge geometry. She's using a worksharp thing that is kinda like a Duckfoot sharpener. It sits at an angle and you free hand sharpen on it.

What we don't know is the starting edge geometry and current edge geometry of both knives. For example the Wharncliffe Delica could have started at 15 DPS and the Para3 at 20 DPS. If she sharpens both at 15 DPS they will both get sharp, but will have different edge geometries. A 20 DPS edge with a 15 DPS micro bevel, vs a straight 15DPS edge.

I'm not sure if that IS the issue, maybe she did a full reprofile on both, but it's a variable that needs to be accounted for. Blade geometry may not affect edge retention that much but edge angle does.

You can’t have a microbevel at a more acute angle than the primary bevel. If you try to put a 15 DPS microbevel on a 20 DPS bevel, you won’t hit the apex until you’ve completely reprofiled the bevel to 15 DPS.

[Superflex]

Delica 4 blade thickness 2.5 mm
Para 3 blade thickness 3.8 mm
Hipster Youtuber not so bright in making comparison of apples to oranges
She ought to stick to reviewing nose piercings and ear gauges

[ZrowsN1s]

Have you seen this video from notyouraverageedc on US K390 v Japanese K390?

No I haven't. Interesting take. Maybe Seki's just had more practice? All the more reason to get more US K390.

I was thinking about this this afternoon and it occurred to me that some of the differences she's seeing could be attributable to edge geometry. She's using a worksharp thing that is kinda like a Duckfoot sharpener. It sits at an angle and you free hand sharpen on it.

What we don't know is the starting edge geometry and current edge geometry of both knives. For example the Wharncliffe Delica could have started at 15 DPS and the Para3 at 20 DPS. If she sharpens both at 15 DPS they will both get sharp, but will have different edge geometries. A 20 DPS edge with a 15 DPS micro bevel, vs a straight 15DPS edge.

I'm not sure if that IS the issue, maybe she did a full reprofile on both, but it's a variable that needs to be accounted for. Blade geometry may not affect edge retention that much but edge angle does.

You can’t have a microbevel at a more acute angle than the primary bevel. If you try to put a 15 DPS microbevel on a 20 DPS bevel, you won’t hit the apex until you’ve completely reprofiled the bevel to 15 DPS.

You are correct, wasn't thinking clearly there.

The better discrepancy would be a 12 degree edge bevel with a 15dps microbevel vs a 15dps edge.

[Buddafucco]

DLTtrading... https://www.dlttrading.com/spyderco-del ... k390-blade

[Buddafucco]

Northwest Knives... https://northwestknives.com/collections ... -c11fsk390