metaldrms

Newbie Needs Help

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Vegetable oil is fine, canola is MAYBE better than most I'd check the stickies in the heat treat section and see what the consensus is.  

How fast steel scale is visible proof why you shouldn't take steel out of the fire and stand there looking at it thinking about what to do next. This is a normal beginner mistake, do your thinking while the steel is heating. Have the tools you need next out and in position so you can go to work as soon as possible when you take it out.

Frosty The Lucky.

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Daswulf I looked up the plunge line jig and that is amazing I was having a lot of trouble on where stop near the handle so tomorrow I will make one of those and use it for my next knife.

 

Thanks.

 

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funny what you can find in the knife making logs if you take the time to look

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You are welcome. :)

What Steve said. Really, it's all laid out here. Well most All of it. Start researching! This is one place you will not get bad info without it being corrected quickly. 

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Don't take any of this personally, it takes time to learn what's available and how to find it. Iforge is HUGE with I don't know how many tens or hundreds of thousands of posts archived by subject. Heck it's hard just to find your way around the sections and subsections. 

Steve sounds all gruff and cranky but he's as big hearted a guy as you'll ever meet.

Frosty The Lucky.

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Thanks for the help I have seen first hand how big this place is. I barely scratched the surface and have learned so much I will go check out the stickies for sure. I think I'm going to check on the canola oil and see if it is expensive because I know vegetable oil is pretty cheap.

 

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And you can get the used stuff for free from fast food places if you know anybody working there.  Used works just fine though the smell can cause your weight to fluctuate. 

 

Note: soon many people will be buying large quantities of oil to deep fry turkeys in.  Many if not most will discard it afterwards.  This is another source of good quality oil for heat treating---often peanut oil which has a high smoke point too.

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1 hour ago, ThomasPowers said:

soon many people will be buying large quantities of oil to deep fry turkeys in.

Yup. I still have a reserve from last year. People are glad to have it hauled away. To be on the safe side have a 5gal. bucket with a good sealing lid at the ready for easy transport.

Oh and you might want to screen it. 

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 Awesome I don't have any friends at fast food but I will visit some restaurants and see if I can take it off their hands. KFC will have a ton I bet.

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A lot of restaurants have deals with companies that take their used oil to convert to biodiesel. Don't be surprised if you get turned down a lot; DO be grateful for anything you're given. 

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Personal connects are great for just about any of our sources of supply. Bottle openers also open doors.

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We just has a Wine and Micro Brewery  tasting place open up in our small town.  I hope to make some opener's for them soon. I would love to set up a trade with them.

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Fellow Smiths,

One trick for extending the life of cooking oil is to drop  some vitamin E gel capsules into the oil.

(I think that this hack  (truc), was discovered,  long ago, by some Chinese restaurant chefs.)

Vitamin E is an anti-oxidant which combats oxidation of that oil. Rancidity comes from oxidized oil.

Another method is to get some carbon dioxide  (CO2),  into the container.  CO2 is heavier than air and will blanket the oil so oxygen,  (O2)  from attacking the oil.

I use some gas from my metal inert gas welder, (M.I.G.  or also called G.M.A.W.) tank.  That gas most often is a mixture of 75% argon and 25% CO2.

The gas forms a layer on top of the oil,  thus excluding the lighter oxygen.

This shield gas works well until the oil is agitated, and the gas blanket is disturbed.

SLAG.

T.P. that is a great idea, and you are making me very jealous.

 

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Hey guys what temp do I temper my blade at and how long? It is about 1/4" with taper towards the tip and its leaf spring steel.

 

Thanks, drms

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I'm there right now and can't see a "heat treat sticky" the title says "all stickies are here" so if someone could tell me where it is i am perfectly willing to read. 

 

drms

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Thanks, I couldn't see anything about that in the stickies. :rolleyes:

So I should probably temper twice at 350 just because this steel is so hard right? I have seen some videos and done some research but am not familiar with all the names of the different crystals or phases. Again thanks for your patience and help

 

drms

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I've had good luck with the leaf springs I've used with a similar heat treat/temper to 5160.

First I do two normalizing cycles. Bring it to just above where it becomes non-magnetic, let it air cool to black, then do it a second time.

 It should be around a bright cherry and 1575 degrees. If you don't have a thermo-couple or way to measure the temperature, a magnet will work, but pay attention and keep checking as you are bringing it up to heat so you don't get too hot. Also during this process and heating for the quench, be careful not to overheat your tip. It is thinner and will heat faster.

Then heat back to just above non-magnetic again and let it soak at that temperature for about 3 minutes.

Then quench in your oil. Canola oil can be bought at walmart for about six dollars and change a gallon if you strike out finding used oil. Keep your piece moving while it is in the oil.

After it is cooled down to about room temperature, put it in whatever oven you are using to temper. I do mine at 400 degrees for one hour, cool, then do another one hour cycle. It gives me an edge that will slice paper, chop into a 2x4 about ten times, and still slice paper afterwards. Good hard edge, but still very durable. 

I also should mention I do test quench/temper on each set of leaf springs I have tried. So far they have treated like 5160 and that is an alloy often used for them. There are other alloys though so you are in essence dealing with an unknown steel. You may want to do a test piece before you do your actual knife. Use that to get the feel for the movement and to get a better idea of your colors as you are testing with a magnet.

You've done a lot of nice work on your blade, so it would be worth the extra effort to play around a bit and make sure you have it figured out before you overheat it or find out that you have an alloy that reacts differently.

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