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Guided knife sharpening jig #6: Making the knob and feet, and assembly

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Blog entry by FancyLearnin posted 05-11-2022 03:31 AM 764 reads 0 times favorited 2 comments Add to Favorites Watch
« Part 5: More fabrication Part 6 of Guided knife sharpening jig series no next part

The next step in the saga of the knife sharpener is to make a knob from a small scrap of pernambuco.

I machined a small stainless steel sleeve I’ll use to mount the knob. I knurled the end so it would bind securely to the hole drilled in the knob. I added a little superglue to help.

With the sleeve mounted in the blank, I could hold on to it in the collet of the lathe. I turned a small ‘divot’ on the surface of the knob, just for aesthetics.

Then, using the dividing head on the mill I machined seven ‘scallops’ in the knob’s edge to give something to grab on to when turning it.

And here is the first dry-fit with most of the parts complete.

Next I cut out the pieces for the feet using a hole saw, and turned them to final shape on the lathe.

Next up was to spray a few coats of General Finishing Enduro gloss.

And final-ish assembly.

I’ll use it for a bit and see how I like it. I’m sure there will be a couple tweaks coming…



2 comments so far

View HokieKen's profile

HokieKen

21690 posts in 2595 days


#1 posted 05-13-2022 12:50 PM

Excellent work! I’ve followed your progress on this build and I really like the design you came up with. I also appreciate your methods :-) Having a metal lathe and milling machine and knowing how to use them sure is a nice thing isn’t it? I like how you used a lead screw to position the carrier block to set the angle.

I’m curious if you’re just relying on the magnets to secure the knife or if there will be other clamping? Also, I may have missed it, but what kind of threaded rod did you use for the carrier block and is there a set screw or anything to lock the position or are the threads the sole retention?

I’ve often pondered making either something like this or a clone of the Wicked Edge system. But, it’s never been a top priority and my Lansky kit and Worksharp seem to always keep it on the back burner. Welcome to the site and thanks for posting such a great blog series to introduce yourself!

-- I collect hobbies. There is no sense in limiting yourself (Don W) - - - - - - - - Kenny in SW VA

View FancyLearnin's profile

FancyLearnin

7 posts in 3475 days


#2 posted 05-13-2022 03:46 PM

Thanks for the kind words. The magnets are the only means of securing a knife on the jig. I’d thought about using some sort of a clamping mechanism, but I wanted good clearance for shallow sharpening angles (such as for filet or santoku knives) and most clamping schemes just sort of get in the way. I bought the strongest classification of neodymium magnets (N52), and I ordered thicker ones than I normally would have so they have higher magnetic flux. They are incredibly strong. The knives, even long and wide ones, are held extremely well. In fact, you have to be very careful removing a knife – you really have to pull. My technique is to tip the knife up on edge (the back edge) so there is less area in contact with the magnet and then pull it off. That works quite well.

The threaded rod is 3/8-24. I wanted a fairly fine thread so that I would have a good degree of precision in setting the angle. The flip side of that is you have to make a lot of turns to significantly change the angle. I anticipated that, and it was a trade-off I was willing to make. Fortunately I don’t need to change the angle too much since most kitchen knives have the same angle, you only need minor adjustment to compensate for the width of the knife.

There is no set screw to lock it in place once the angle is set. It doesn’t move at all when sharpening. I had thought about adding some sort of locking mechanism, but it turned out not to be needed at all. And the thread is so find that even if it did move it would be insignificant to the sharpening angle.

I had put this project on the back burner for a long time, but eventually my frustration with dull knives overcame my inertia. Plus I had to work out the design in my head, given the design criteria I had set for myself. I had not seen anything that works exactly the way this one does (though I am sure they are out there), so I did a little head scratching to start. I didn’t have any means of sharpening knives before – other than freehand, which never seemed to turn out too well for me. Now my knives (and scissors – more to come on that application) are razor sharp and I go around the house looking for things to sharpen!

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