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Knife Sharpening Tool V2.1 (with video)

by CNCKitchen Jan 17, 2016
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I am slightly confused as to which files are the most recent version. My guess is that the ones with no V1 in the prefix, right ? V1's are the old version and V2's are the files with no prefix. Correct ?

You are correct. There is unfortunately no way to add folders so I had to do it that way.

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I was unable to get ahold of the stones you posted in the link locally, (ie amazon), and I was able to prototype an adapter for ones available on amazon if you are interested in including this in your next revision. I also remixed the feet a tiny bit to accept (and not be so sloppy really) on the locally available round stock here in the US at 3/8 inch. Luckily metric screws and bolts arent so hard to come by here.

link to amazon item: https://www.amazon.com/gp/product/B0796SW8LV

link to the adapter: https://www.thingiverse.com/thing:3681202

Sharpening Stone Adapter for CNC Kitchen's 3D Printed Knife Sharpener

Direct link to captainslooose's adapter: https://www.thingiverse.com/thing:3681202

Sharpening Stone Adapter for CNC Kitchen's 3D Printed Knife Sharpener

Fantastic design, I have printed all the parts in PETG and am waiting for the rods and stones to arrive. One observation I'd make, if you re-visit this, is that stick on rubber feet tend to be more secure when secured within a moulded/printed recess.

It tends to reduce the risk of them getting peeled off; if you look at commercial designs they almost always recess the feet slightly. It also gives the advantage of locating them consistently during the attachment process and tends to improve adhesive performance in terms of impact absorption and shear strength. It also provides a neater appearance.

It's a tiny detail in what is otherwise a really well thought out design - thanks for providing the F360 files, I made a longer guide to allow the support and sharpening of smaller pocket knives.

Hi Stefan, thanks for that great Design. Just finished the littel weekend projekt and it came out perfect! :-) One thing though: there is a mistake in the BOM: the Guide needs a set of M5 hex bolt, washer, thumbscree. Best, Björn :-)

You should make the clamp to hold the stones adjustable. This way you dont need tape, and it is more secure.

hello, how about adding a function to also support planes and chisels ? also a 35° piece

Cool design. Thanks for adding the Fusion360 file to the project! I just opened up the Fusion file. Shouldn't the Guide > Body1 have a hole in it for the bolt that holds the swivel guide together?

If you'd put a hole in there supports would be necessary. This is a trick that the hole can be bridged with one layer that you can easily remove with a knife or a drill bit. Take a look at the part in your slicer.

Hi, is it 8mm or 10mm magnets now? It says 10mm in the parts list and 8mm in the post make section. Cheers for the great design!

The 8mm magnets are actually the ones used in the V1 design. Forgot to delete that part.

Dankeschön :)

Hi Stefan, nice and super usefull idea .. inspires me to build a similar holder tool for finish-refaceing/sanding my 3d printed mouthpieces for sax/clarinet .. you mentioned Fusion 360 as a CAD tool .. could you share also a Fusion file .. in particular this cute flex-rodholder could be my key feature ...

Fusion file can be found under the downloads (f3d).

How are the stones attached to the handles?

They are just slit in from the side.

And how are they fixed? Glued? Clamped? Screwed? Magical air anchors?

I was curious about this as well, and I looked up the stones on Ebay, and found that they're affixed to a base that has a dovetail on the ends, which this model is designed to retain.

In the handle there is a slot to put in an M4 nut. There indeed is a dovetail and in combination with this nut and a screw, you can fix the stones.

Comments deleted.

Hello awesome design! could you please upload cource files, to modify stand for base fixing, like screws. and to adapt it to my magnets?

The STEP file is available for download.

Hey, great design. I would like to adjust the rod and screw sizes, mind uploading and stp?

Just uploaded it. Have fun with it and please share your results.

Great, thanks.

Btw I just found this https://www.youtube.com/watch?v=6W7hUEa_NDE looks very similar to this system as well.

Nice design! Nearly done with printing. But I noticed a hole in the stone holder, with another hole at the side. Probably for a nut. What is/was the purpose of this hole? A screw to secure the stone?
Stones and magnets are on their way, so I hope to post a "Made" soon...

Hello!!! This is wet stones you using on video! Do you hear the sound! You should wet them! Before and During! You are welcome.

Well, hello!!! Thank you for you positive comment! I'm glad you're not overreacting. Did you make one? I guess not... But you're welcome indeed.

What length rod do you recommend for the "foot" and the "Upright"? Also, it seems to be difficult to locate 10mm aluminum rods here in the U.S. I am using 3/8" rod instead. It fits a little loose but I think it will work. Any chance you might release a version using SAE fasteners and round stock?
Great design by the way! Thanks for sharing it!!

Thank you for this beautiful design!

Yes, they look like the ones I use. Should be suitable.

Just made this. I will post a "Made" soon. Looks nice and thought through. Some minor comment though to others who want to make it to print the angle guides a bit smaller - they don't really fit below the stone if you align the knives to the edge of the base (and if you want to set the angle without a knife). The set angle will also be off by the angle of the non-cutting part of the knife blade, but I think that's simply part of that concept of a knife sharpener.

@cocoknight: what did you use fix the screw of the alignment part? Also your knob?

Now the next step for me is to insert some magnets. Not sure yet which size fits in well, but I ordered some 8mm diameter, 5mm height ones - I hope they are strong enough although the hole is deeper.

I used a simple wing nut for the alignment part. That keeps it well in place.

Try to press fit the magnets into place and even use some glue to hold them even better. Push them a little bit further in than the level of the surface is. This will avoid scratches on the knifes blade.

What size magnets please?

Disregard: 5 8mm neodymium magnets in the holes to hold the knifes
I ordered 100 8mm x 1mm magnets for #3.80 from dealextreme

I used 8x10mm magnets. They fit snug in the holes and if you push them all the way in then there is some play so they do not scratch the knifes.

Where do you use the angle gauges?

Take a look at the third image in the gallery. You place them between the stand and the back of the knife.

Bought stones today! Waiting for them before print!
Do the jig need to be strong, such to use polycarbonate or is normal ABS enough?

The tool does not really see any high structural loads which is why you don't need any special plastics. When using the device you really don't apply a lot of pressure on the blade you try to sharpen. Use more or less only the weight of the stone itself.
I would recommend using PLA since otherwise you might get problems with warpage of the stand and the stone holder.

Sorry I dont get that option.
When trying to download it gets all the files. Also the ones with zero bytes.

After downloading some files are 0 bytes!!!

This seems to be a problem with Thingiverse. If you download the files on their own they are working fine.

Great desing, thank you for sharing.
Could you please also provide a link to the stones?