Problems with lapping 0.5 and 0.1 micron
- This topic has 9 replies, 5 voices, and was last updated 08/20/2018 at 10:20 am by
.
-
Jabas2000, two questions:
- Was the knife sharp?
- Did the apparent scratches laid down by the 0.5 and 0.1 micron DLF increase in appearance as you continued to stroke with them? (i.e., get worse)?
BTW: here is a link to a similar subject matter Wicked Edge Post I started some time back.
Marc
(MarcH's Rack-Its)3 users thanked author for this post.
The link Marc provides refers to a situation where several sharpeners reported having scratches being introduced by the 0.5 micron film. so that might very well be happening here.
I have found that polishing over scratches left by a previous grit tends to exaggerate the depth of the scratches. This makes it seem as though the polishing is introducing new scratches when it really doesn’t. To be sure, you should reverse the direction of each successive grit so you can be sure of exactly when the scratches were laid down and by what grit. Polishing will only remove the faintest of scratches, so it’s the deeper scratches which tend to be amplified.
4 users thanked author for this post.
I have had the same experience and I’m confident it’s coming from the films … I’ve tried many different film manufacturers and they are all the same at 1um or less. That’s why I stop at 3.5um and switch to strops down to .25um now.
Marc,
I’ve tried just about every stropping material out there and prefer/use a nano cloth type material as it’s manufactured very precisely and has the most potential for zero contamination.
I strop down to .25u (quarter micron) and do not decrease the angle at all as the cloth is very thin with almost no give. The small amount of micro convexity it does have is not a bad thing imho.
Josh, is there any difference in technique loading the nano cloth strops and using them as compared to regular old cow leather strops? (I got it, the same angle as sharpening angle). How much pressure do you exert? What kind of care and maintenance is required with the nano cloth? Anything else you can share? Thanks
Marc
(MarcH's Rack-Its)Josh, is there any difference in technique loading the nano cloth strops and using them as compared to regular old cow leather strops? (I got it, the same angle as sharpening angle). How much pressure do you exert? What kind of care and maintenance is required with the nano cloth? Anything else you can share? Thanks
No difference in technique – just paste em up and use them. Pressure is relative to the user but I use what I would consider medium force. No care and maintenance other than keeping them free from contamination. Even w/ the strops I will get a random scratch here and there and have to spend extra time stropping until it’s minimized – I spend more time stropping than w/ the actual stones probably. Maybe 400-500 passes total.
I spend more time stropping than w/ the actual stones probably. Maybe 400-500 passes total.
Wow, that’s a lot more passes than I have been doing with my strops. Is that a total for your whole strop progression, or is that 400-500 passes per individual strop grit?
Beautiful work as always
- You must be logged in to reply to this topic.