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July 22, 2019, 23:40:59 pm


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Author Topic: Cutting boards  (Read 1387 times)
lloydsp
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« Reply #15 on: April 05, 2019, 11:55:27 am »

Bernhard,
It's quite reasonable to cook your own natural linseed oil.  That causes all the fats and non-curing/slow-curing resins to separate and float to the top, where they may be filtered-out.

The 'boiled' remainder (which is never actually boiled, but water-bath cooked, usually twice) will cure faster, harder, and with a longer-lasting finish that will never become sticky with time.

Lloyd
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gmoo
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« Reply #16 on: April 05, 2019, 12:30:15 pm »

Thanks, Lloyd,

I found a cold bleached swedish linseed oil without any toxic stuff.
Polymerisation takes place within 2-8 days instead of over 4-6 weeks.
It´s expensive, but still cheap enough to prevent me from brewing my own oil.
It´s called "Linolja" and is availabe at dictum in Germany.
(I´m not sure wheter it´s allowed to place a link here.)


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Bernhard
EddyCurrent
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« Reply #17 on: April 05, 2019, 13:30:44 pm »

This would be my choice;
https://osmouk.com/sitechaptern.cfm?bookid=Products&chapter=82&page=255#TopOil

Not cheap but it goes a very long way.
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gmoo
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« Reply #18 on: April 05, 2019, 14:08:03 pm »

My personal opinion :

Good stuff for furnitures, but NOT for (my) cutting boards.

"..., lead-free siccatives (drying agents) and water-repellent additives."

This means : contains cobalt, mangan ... and/or other stuff.
The one say it´s pure poison, other say "oh.... is so less, forget about it".
Beware of the sanding dust.

I will not lay my food upon this.

I´ve checked very carefully the ingredients of many "Bio" or "Natural" products.
I found not a single one really free of chemicals/toxic stuff.

I have much time to wait, and so my customers have to wait. Grin

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Bernhard
dh42
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« Reply #19 on: April 05, 2019, 23:40:19 pm »

Hello

Very nice objects and very great job !

++
David
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lloydsp
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« Reply #20 on: April 06, 2019, 00:22:45 am »

Bernhard,
I have three pieces of furniture here in the home which I made in the early 1980s.  They were all finished with the 'home-boiled' linseed oil (working from an article I found in one of the popular magazines of the day).  Two of them were simply finished with the oil over bare wood, and no other.

They have retained their gloss, have not become sticky, and have not discolored significantly -- although they both show some 'patina' now. 

I have a third which was sanded smooth, treated with potassium permanganate, then washed to remove the color of the salt and steel-wooled after drying to remove any 'nap'.  After drying, it was also finished with the 'boiled' oil.  It has developed a marvelous multi-colored patina that would be the envy of any woodworker. 

And, FWIW, I was no 'expert' at the time (am not one now, either)... just following instructions from the magazine articles.

Lloyd
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Mark81
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« Reply #21 on: April 06, 2019, 07:24:47 am »

Very very good jobs! I have to learn so much and I won't getting closer to them!
Out of curiosity... How much time is needed to make, say, the coffee serving tray? I mean then actual working time: stock preparation, machine cycles, finishing... let's leave the drawing-time aside.

And what other equipments are recommended besides the CNC?
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« Reply #22 on: April 06, 2019, 10:48:33 am »

I need approx. 3-4 hours for that serving tray (plain production time).
3-4 hours for the CAD/CAM.

In addition to the CNC I use a table belt sander, a drum sander, an excenter sander,
a table buzz saw, a router built-in the table, a conventional milling machine, a turning lathe.
thousands of screw clamps and a lot of vacuum cleaners. Grin
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Bernhard
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