Breaking in new Flex Cut chip carving knives
I have almost no chip carving experience, but, I purchased a set of flex cut chip carving knives. I expected these knives to show up sharp and that all I needed to do was to strop them to keep them sharp.
I also have a chip carving knife from Hock Tools. I had purchased a ceramic stone to sharpen it (back in 2011) but I managed to lose it so I grabbed a Black hard Arkansas stone from Dan's Whestones (Dan claims this is their finest stone) and I was using that. Note that I intend to try the Norton Ascent Ceramic stones since Norton claims that they produce a better edge than their translucent which is their finest stone.
I made my own strop and added the Flex Cut compound on the rough side. I was stropping my Flex Cut knife to keep it sharp. It cut, but the Hock Tools knife seemed much sharper than the Flex Cut knife so I bit the bullet and I used the Arkansas stone rather than the strop. The Flex Cut knife cut much better. So I came here and I saw this post from a few years back:
https://sawmillcreek.org/showthread....-carving-knife
I saw a claim that stropping made the knife sharper and that the only thing needed to keep it sharp was stropping. I have already packed everything but I will try some tests in the next few days, but I do have some questions:
- Do you really just need stropping to keep your carving knife sharp (for me that means chip carving) after it is sharp?
- I thought that Flex Cut knives came fully ready to go. They were shiny and sharp, but are sharper and cut better off the Arkansas stone. It had not occurred to me to throw it back onto the strop. But, does this sound right? Maybe I am just poor with stropping.
- Maybe I am rounding my edge on the leather strop. Maybe I can just try it on a bit of popular for stropping? Would hard maple be better?
I am just trying to figure out what I should try next. Ironically, when I had a chip carving class in 2011, they did not even mention using a strop. All they did was sharpen on a ceramic stone.
Also, based on the comments in the link above, I ordered a copy of the chip carving book to give it a skim / read.
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What I learned before I could chip carve
Quote:
Originally Posted by
Robert Engel
...
If you take a look at Pfeil and Barton, the blades are very similar. I don't understand John's distaste for the Barton knife, it is better than anything else I've used - Hock, Pfeil, Flex Cut (Hock is the worst).
Unless Barton has changed their ways, the knife I bought many years ago from Woodcraft was useless as purchased. The bevel on it was short less than 1/8", can't remember, but what I do remember is the angle at the cutting edge was WAY to big. The knife couldn't enter the wood without pushing it to the side, tearing and distorting as it went. A clean cut was impossible. It also had so much friction it was difficult to either stab or pull. After sharpening the existing bevel and trying for a few days I put the thing in the drawer and forgot about it for years. Then in 2015 (I think) I met expert chip carver Bill Johnson at the Klingspor shop near Asheville, NC. (https://www.carolinamountainreefs.com) Someone turned a small round platter (probably worst demo I ever saw) and then Bill carved on it. One of the most useful demos I've ever seen. :)
Bill was gracious to talk with me extensively and show me some of his work up close and how he held and used the knife. One look at his knife and I knew exactly what the problem was with the Barton knife - the bevel at the cutting edge was too large an angle, too blunt. I told Bill about this and he said for a long time he'd been trying to talk Wayne into preparing his knives better to start with instead of shipping with a quick and useless grind. Perhaps he finally listened and is selling knives more ready to use now, I have no idea.
BTW, Bill Johnson probably spent an hour with me that day. Over the next few months we communicated quite a bit by email. I ended up sending him a variety of woodturnings from basswood that he could chip carve - ornaments, goblet, one of my small squarish platters. Without that chance meeting and his help I probably would have never tried chip carving again. I had bought planks of basswood from 2-4" thick just for woodturning.
As I mentioned, I hand to extensively reshape the sides of the Barton knife before it looked like Bill's and was actually useful. I also had to shape the MCC Modified and the Hock knife, but not as much as the Barton.
After sharapening all three knives I carefully measured near the tip, where all the carving takes place, and made this drawing showing the angles on the three knives. I wasn't trying for these angle, they were just what I ended up with after grinding and sharpening. They all work.
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I use these two the most:
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I wanted to learn chip carving so I could carve on round things made on the lathe. Most of the carving I'd seen in books and elsewhere was on flat things. After getting the knife right I was finally able to start making things after a couple of months of practice.
Some of my practice pieces and a few turned pieces.
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Quote:
Originally Posted by
Andrew Pitonyak
...Hock - I have not had a problem with this. I let a friend try it yesterday and he declared it the best; he was also holding it like a pencil to chip carve. The plunge knife is much thicker than pfeil. I am curious what you dislike about the Hock chip carving knife. Is it the handle or the blade
I found the grip on the knife to be the very important. The grip not only defines the two angles of the cut but stabilizes the hand to allow control. I don't think I could chip carve holding the knife like a pencil. I used the method that Bill showed me and what I found later in several good books. Since all of the books were carving flat things I had to modify it a little bit when carving on rounds but it is very close, just the angle of the wrist had to change since the wood wasn't flat on the table. I found that using the thumb for support was important. Here's an example:
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I also looked at some cheaper knives and tried holding some. A few didn't angle the blade properly - I think that would be difficult to use and painful on the wrist/hand. I far preferred the handle shape that was like the Barton. BTW, I don't think Wayne Barton invented this handle shape or the angle of the blade - I found nearly identical knives in a book on the history of chip carving in Europe long ago and it showed almost identical. Perhaps he re-invented it, not aware of the earlier knives, I don't know.
This picture shows the Barton knife next to a cheaper knife, a huge difference.
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It did take be a while to learn to hold the knife when sharpening and honing without rolling it even a tiny bit. I think the sharpening kit I mentioned and the method they teach to use it makes this easier. It certainly makes a sharp edge! If anyone is interested, this is the kit - it has a video on the page which shows the method.
https://mychipcarving.com/product/knife-sharpening-kit/
If using a stone, hone, or strop I set it up so I could use my hand and thumb to keep the blade angle constant to keep from rounding over the edge.
JKJ