Sean, I added a “fender”, the length of the cut is about 7 cm, and the maximum diameter is about 10 cm.
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Hey Goran
I also will be hiding my wood chunker out of sight 
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A short report on the wood chipper screw:
- this tool is very effective in preparing “motor fuel”, it works quickly and safely
- when cutting thicker pieces (thickness over 7cm) there is considerable friction and heating of the blade
- from observing the operation of this machine, I had the idea that it would be good if the conical support plate was movable, so it would move slightly when cutting thicker pieces and the screw blade would not cut so deeply into the wood, which would reduce friction, well, the final knife does most of the work
- in fact, the cutting screw would act as a feeder and pre-cutter, and the final knife as a Wayne chunker,…
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Tone, you still make me want to copy you…but it’s often a difficult experience.What spring did you use to press the wood onto the screw? Is your screw conical like Goran’s?
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Thierry, the blade of the screw is not conical, only the first half of the first wrap is reduced, so that it can grip wood up to a diameter of more than 10 cm.
The movable plate, along which the wood slides and presses it against the blade, is just an idea, for now I have a fixed plate installed, you can see all the details in the pictures.
I have an idea that the spring must be quite strong, since there are large forces here, I will leave the possibility that the spring force will be adjustable with a screw… 
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You probably want to use like shock absorber with a coil over spring. Then it helps eliminate any bounce. While not cheap, they are easiest to get and replace. 
How hot is the friction? Is this with dry wood or wet wood? It isn’t charring and starting a fire is it?
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I tried cutting dry and fresh wood, of course it cuts fresh wood easier, but the blade still gets quite hot. The Czech screw chipper I bought has a turbine for ejecting wood chips, and at the same time it draws a lot of air through the chipper, which cools the blade well, but despite the intensive cooling, the housing gets a little hot.
In the link you can see that people use water cooling of the blade at slow rotation. My goal is to cut up to 10 cm thick with as little friction as possible, which reduces the load on the chipper structure, the load on the bearings and the driving force …
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Tone, culd you not just install a sprayer nozzle to soray a mist of water on the blade? Shuld lubricate and cool the machine real well.
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He can which i think is the point of showing that video.
The friction itself might be coming from the thickness of the blades. It isn’t a very sharp angle on the blade and it is thick metal, so there is a lot of rubbing against the blade where it isn’t actually cutting. It is really just squishing the wood.
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The second machine in the video was closer to what I would want to produce for mulch and composting. I’ve been looking for a while for something that produces flat slivers like Jean Pain used in his compost piles. I have an old six inch jointer/planer I thought to use for a cutter head. I’m thinking that a spring loaded lever like Tone showed in his drawing might be able to keep the wood fed into the cutter at an even size. I’ll have to play with this awhile.
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If you increased the pitch of the cutting screw, from input end to output end, would that separate the chunks and reduce the friction? I know it’s not a very appealing thought if your cutter is already constructed.
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Is that your hand in the photo Tone? That chunk must be at least 20cm dia 
I chunked fuel too today, but not as much
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remember, in a previous life Tone was called Obelix
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Who’s Asterix then? Kristijan maybe?
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You just won the CD player
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Oh god you guys made me laugh
Funny you say that thugh, l visited Tone just last week, can confirm these chunks are indeed wery big!
Unfortunaly thugh the screw chunker was on a bench at a time so l wasnt able to see it in action.
But l can throw you guys a litle bone… l saw the Mazda pickup on the car lift… just a litle teaser:
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What I say/show now is not political, but practical:
How many “rubber” bath ducks does a little 10 year old girl need?
How many pairs of shoes does an adult woman really need?
And there are two more of these shoes storage units in our bedroom. One single shelf mine.
Outdoor slip on boots. One pair actually made-in-USA
Up through high school aged 18 I had only three pairs of shoes and boots. ALL quality, durable, made in the USA. Last for years. Adult working, specialized recreation; and formal wear only added 2-3 pairs more.
Today for me total I can acount for only five pairs of boots and shoes. Three made in USA. One in the Domican Republic. Only one made in mainland China. The current muddy ones Muck brand (not cheap) made in China now leaking after only one year.
American consumerism really began in the 1870’s with Civil War mass production able to be relatively quick delivered by the growing expanding rail train network. Then . . . Demand created by flooding high speed press advertising became mass marketing. Then that evolving into a formal Art. Then into a much studied degreed phycological science. We, the U.S. were the world flooding manufacture in the 1890’s → early 1930’s. Wrecking other countries self-makings. Well; we had our decade of set-back over-reach crash in the 1930’s. Anyone thinking the same over-reach crash was not an inevitability to China, does not read and study history books.
As individuals we can choose to shake off cheap junk, consumerism.
As societies and cultures . . . how? It seems it aways must be over-reach, collapse’s, and burn downs miseries. War: (George W.!) only buys a time set aside from a rebalacing. Late 2007-2010 was a rebalancing. Covid shutdown/lock-outs was just another War extending until . . . ???
So fellows . . . what is overall Europe’s excuse for Made-in-China dependency now too, eh?
Same as ours imho; latter 20th Century, and now early 21st Century. Banks, Investors, addicting folks for thier own short sighted Greeding.
Of course, Ha! Ha! Tools are a mans “necessity” exception to woman/females too many rubber ducks and shoes.
Steve Unruh
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I would say: it’s the same, consumerism…
Buy cheap stuff and throw it the next day…
For me: China and india makes replacement parts for old stuff that no one makes anymore, Wohoo!
Low quality, but could save some old stuff, or fixed when new to get better.
How many chainsaws is it necessary for a man to own?
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Opps. Sorry GorenK. I posted onto the wrong topic.
May I leave it here as I am lazy to learn all of the details of moving posts?
Best Regards
Steve Unruh
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