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Sparky93
07-15-2011, 02:07 AM
A while back I took up the notion to make my own knife. I had a piece of 1/8 inch stainless steel so thats what I used. I ruffed out the shape with a metal chop saw and then shaped the blade with a bench grinder. Just as I was about done shaping the blade, the bench grinder shocked the snot out of me, I went for the off switch and it shocked the snot out of me and once I finally got it shut off I found it doesn't work any more. So I spent about two hours finishing the blade shape with a file. I have a couple of questions about what I need to do to finish it.

1. what would be a good tool to put the edge on the blade? I have access to an angle grinder and another bench grinder.

2. I don't know much about the metallurgy of stainless steel or heat treat. Do you heat treat stainless steel? If so, whats the best way to do it with minimal tools. I have access to a torch if thats any help. Is stainless heat treated the same as normal steels, if so will the magnet test work?

I'll post pictures of it tomorrow.
canid
07-15-2011, 02:33 AM
Stainless steels are generally extremely particular about their heat treatment.

your options are basically to start with another piece that's already at the desires state and do all your work at low temperatures, making sure it never gets hot enough to temper further, send it out to another shop equipped to do the work or invest in a good heat treat oven and some pricey stainless foil and learn to do the proceedure yourself.

Which stainless are you working with?
Sparky93
07-15-2011, 02:36 AM
I have no idea, it just a random piece that was lying around. Is there a way to tell what type of stainless it is?
canid
07-15-2011, 03:49 AM
not easily.

There are many formulations for stainless alloys, just as there are many formulations for low-alloy, tool and mild steel alloys. If you don't know your steel, you can't know your heat treatment procedure. This is true for any steel. The best you would be able to do, short of having it analyzed with sophisticated equipment would be to guess.

do you have any idea what the steel was before it was a random piece laying around? If you know exactly you can sometimes narrow it down quite a bit.
Sparky93
07-15-2011, 03:57 AM
It was in the srapp bin in the high school machining class I took and the teacher gave it to me, so I have no earthly clue as to what it is. I have read that once you get steel to it's critical temp. magnets are no longer attracted to it. Would this work for stainless?
canid
07-15-2011, 10:02 AM
You're not getting it. It is very unlikely but it depends what the steel actually is. There is no such single entity as 'stainless steel'. There are a great many alloys collectively called stainless steels and the only way to know the heat treatment procedure for them is to know what the composition is. The answer is already in my above posts.
Canadian-guerilla
07-15-2011, 10:07 AM
how about pics ?

during and after
canid
07-15-2011, 10:32 AM
Don't get me wrong; you can try it anyway. It would be a big like dropping a pile of logs on the ground and hoping for a cabin, but anything is possible.

Here is some info on heat treatment of stainless steels:
http://www.azom.com/article.aspx?ArticleID=1141
Sparky93
07-15-2011, 12:09 PM
Thanks Canid for helping my mission impossible. I guess I'll just go for it and hope for a cabin :) If it doesn't work it doesn't work.
Sparky93
07-16-2011, 12:06 AM
Heres what I got.
https://lh4.googleusercontent.com/-jzdBSQH2WeE/TiEKqxdvzsI/AAAAAAAAAGs/U8sba0fytCY/s288/P7150469.JPG
Winter
07-16-2011, 01:35 AM
I like the shape. You could grind it out for practice and use it as a throwing knife when it's done.

Get ya some steel from a junkyard. Sometimes you can find some good 3/16" leafsprings.

All leafsprings are good knife steel, if they don't have stress fractures and what not.
Sparky93
07-16-2011, 01:46 AM
I like the shape. You could grind it out for practice and use it as a throwing knife when it's done.

Get ya some steel from a junkyard. Sometimes you can find some good 3/16" leafsprings.

All leafsprings are good knife steel, if they don't have stress fractures and what not.

Actually somebody gave me a leaf spring the other day for just such a purpose, but it willl be a while before I do anything with it. I'm off to college here in a few weeks.
Winter
07-16-2011, 02:31 AM
They allow angle grinders on campus?

Beat's getting drunk, high, and knocking up some college girl.
Camp10
07-16-2011, 07:21 AM
High carbon stainless isnt going to be kicking around in the junk bin at a high school shop. The stuff is hard to weld, machine and hard to learn on. The stuff you have is likely as hard as it will get. As Canid said, Stainless is a catch-all name for lots of steels with different alloys in them giving rust resistant properties. The temps for stainless that can be treated need to be controlled, they have different heat treat temps, quench methods and tempering cycles. Start with something simple..like that leaf spring.
Rick
07-16-2011, 07:39 AM
Sparky - Stainless steel is really a misnomer. All steel will stain if left in bad conditions long enough. They make stainless steel by adding chromium and reducing the carbon content. As the chromium increases the steel becomes more "stainless" but it becomes more and more difficult to sharpen and its ability to hold an edge decreases. Knowing how much chromium is in the metal you used makes a big difference in how it's handled. That's why they can't give you specifics.
crashdive123
07-16-2011, 07:49 AM
Sparky - lots of good advice has been given regarding stainless steel. I like the shape of your knife - maybe you could just save it as is and use it for a template for future knives?
kyratshooter
07-16-2011, 12:16 PM
They allow angle grinders on campus?

Beat's getting drunk, high, and knocking up some college girl.


You either do not know how to party or you can own one he!! of an angle grinder!!!
Sparky93
07-16-2011, 01:15 PM
They allow angle grinders on campus?

Beat's getting drunk, high, and knocking up some college girl.

I could probably find an angle grinder on campus, but I don't know how knife making would fit into their no weapons policy :)
Sparky93
07-16-2011, 01:17 PM
Sparky - lots of good advice has been given regarding stainless steel. I like the shape of your knife - maybe you could just save it as is and use it for a template for future knives?

I was kind of thinkin the same thing, I just wish I had used a metal I knew what was, before I put all the time and one bench grinder into this one.
crashdive123
07-16-2011, 01:42 PM
It's all practice. I learned very early on that every piece of steel that I pick up will not end up as a knife. It's best to practice on scrap and then move on from there. You have a real nice shape with that blade. Mose knife makers I have met will have designs that they like both in cardboard and in aluminum (more durable). Spending time to get just the shape you want is not wasted at all - it's an investment.
canid
07-16-2011, 03:00 PM
I have many templates as well. i've taken to using them as stencils with spray-paint when laying out blanks for grinding. I have found it helps.
Sparky93
07-16-2011, 03:37 PM
I bet high temp spray paint would work good.
Pocomoonskyeyes3
07-16-2011, 06:07 PM
Just for anyone interested in "Suitable" Knife steels....

http://www.zknives.com/knives/steels/steelchart.php

Rick you are correct about the Chromium, however there are some other components that are also added to make it even more stain resistant. Like Molybdenum. Some also believe that Nickel does this as well.....
http://www.zknives.com/knives/steels/steelelements.shtml
canid
07-17-2011, 02:31 AM
for really high temps, soapstone marker will stay on even through forge heating.
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