Works nice Goran. Looks like the last few inches does all the work. Could you make it shorter and still work?
12 Likes
Yes, about two last turns does most work, probably half of the screw would work also.
If i put in maximum thickness its built for, all of the screw would work.
Iâve started build kind of a wedge out of thick angle-iron, to be mounted against the anvil, to direct the wood along the screw, but the tests worked so well, i never finished it.
12 Likes
In fact, there is a lot of friction when cutting hardwood, so it is good to have the final knife do most of the cutting, cutting in the style of a Wayne chipper, while the spiral of the screw ensures even wood feeding, and the geometry of the funnel of the inlet opening bends the wood, where the bending force presses the wood against the spiral, which is important for continuous feeding and perhaps slightly easier cuttingâŠ
17 Likes
That is great engineering Tone, i totally see what you mean, the perfection of the screw chipper 
12 Likes
Tone: The propeller must drive the wood at a speed that depends on the screw pitch. Would you recommend a particular screw pitch for this construction?
I canât wait to see how you finish this build.
9 Likes
Screw pitch determines chunk size.
Rindert
10 Likes
I made this kind of hatchet today, no real quality work, no real forging, just cut and welded a old lawnmower blade, and put it on a spare axe handle.
Going to try it out for de-limbing, get of twigs from the thin stuff im going to run through the chip-chunker, before i forge a real/better one.
This is only grinded real sharp, going to run it on the âstoneâ tomorrow, to get it REALLY razor sharp.
16 Likes
Goran, are you left handed? Is that the reason you ground the left side of the blade? I am right handed and I would have sharpened the right side of that blade so it would follow close to the trunk better.
11 Likes
You got an eye for details mr Don, yes, im left handed.
But i actually sharpened both sides, itâs a test, i donât want it too aggressive in the cut, so it not âdigâs inâ in the trunk, something like a wood-carving chisel.
Have to test it out, if i feel âtiredâ in the wrist after use, im going to experiment some more.
11 Likes
That looks really nice Tone
Very sturdy construction.
15 Likes
What a great tool!!!
11 Likes
Great work Tone, super-nice
Now i canât show my screw-chunker anymore, i have to hide it away⊠
12 Likes
Sorry Goran and thank you, I feel a little rude for intruding on your topic, your wood chipper works really well, you donât need to hide itâŠ
13 Likes
First, you get style points for the triangulated rear bearing mounting. It looks cool. 
However it will probably have to be somewhat covered up since the chips are not all landing in the wagon.
Is it actually pulling the brush in or did you have to push it a bit?
What is the spacing between the flights? it looks about 8-10cm. But I have to ask.
10 Likes
That looks like so much fun to use. It all looks very professional and well build. I really like how compact and simple it all is. And mounting it on that trailer really makes production streamline.
13 Likes
No feeling sorry Tone, you are much welcome in this topic
10 Likes
great work, the whole family have seen your great video
10 Likes
Tone and Göran - you two have great fab skills, but above all impressive determination.
12 Likes