my A2 warped!!

panch0

panch0

Joined
Jun 16, 2008
Messages
3,415
When I grind a blade I lay it on a flat surface and look for warpage. I just ground out the flat grind on this A2 blade and it is warped. I don't think I ground it crooked because the tang has some warpage also. Can I save this blade? What can I do for this not to happen again? My heart just about jumped out my throat when I realized this. I will post a photo in a bit.
:grumpy::(:(

The first one shows another blade ready to grind and it is flat.
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Look at how the end of the tang is also warped.

picture.php

picture.php
 
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if it is not heat treated, put it on your anvil and whack it with a hammer. That should do the trick. If it is heat treated, I dont know what to tell you.
 
you can take to 3 rods, 1 on each side of bend, and one on the opposite side of knife right in middle of bend, get it all lined up in a vice, then tighten till it's just beyond the bend point, only slightly.

if you dont go just a fraction past straight the kink will not come out the whole way, but you cant go to far as to kink it the opposite direction,

this works very well......at least my limited experience trying it has been positive results.

btw, still didnt forget bout ya.
 
Thanks bro! Will try that also.

Thanks, I can wait, and the mail man don't mind me running out there like a little kid everyday.:D
 
If you've left enough room on the blade to work, I would heat treat and get it as straight as possible out of the oven then grind the rest out. If you plate quench your un-ground blades in the future, you won't have to worry about it.
 
My guess is its was bent before you started, it really doesnt matter if you use a plate quench. Put between two alum plate real tight in a vice and it will be flat.
 
The plate quenching will fix the tang, but if there's warp in the blade he may have to take it out by hand.
 
depending on how you grind and if you've stress relieved the A2 blade prior to austenizing, you could still end up with some sort of warping (if you use plates that are colder than room temperature..

it's a known fact that applying pressure to steel while grinding is gonna cause stuff to warp. Not to worry. Pad a vise with some aluminum pieces around the jaws and with the vise opened say around 1 thickness more than the tang itself, just work out the warp by putting the bend or whever in as far as where you see the warp and with some light pressure first bend it back to straight. I would NOT use a hammer right off the bat. Using a hammer will cause probably cause more stress and then you might end up with an actual bend instead of a warp.

The brass rod thing works well too.

It will happen again i'm sure, so plan on it and don't worry especially if it's not heat treated. I have even heat treated A2, noticed a warp, straightened a blade even below 400'F and NO Snapping !
 
holy jeez... Pancho, how hard are you pressing that A2 to the grinder:eek: ..... just press enough to let the abrasive do the cuttin...





;););) just teasin bros

i'd heat it up a little and tap it straight... no biggy
 
The blade was perfectly flat when I started. It was when I was almost to the top of the grind when I noticed that the sparks were coming off the edge of the belt and not the middle. So I took a closer look and saw that it was warped. I did the brass rod trick and it is back to normal. Thanks guys. It was the first time a blade has warped on me and I guess I freaked a little.

-frank
 
Frank, just for future reference here is my jig to straighten blades. Simple enough like previously mentioned but gives you much more control than a hammer especially if you need to do it after it's hardened.

Patrice
 

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Those are cool Patrice. I used some brass rods and held them by hand until they stayed in place. Thanks for the idea.

-frank
 
Patrice Lemée;6716135 said:
Frank, just for future reference here is my jig to straighten blades. Simple enough like previously mentioned but gives you much more control than a hammer especially if you need to do it after it's hardened.

Patrice
Click to expand...

sorry, but i must be a copy cat and make a set of those, never give it no thought, always just done it the hard way:rolleyes::o

thanks for showing them
 
Leu Custom said:
depending on how you grind and if you've stress relieved the A2 blade prior to austenizing, you could still end up with some sort of warping (if you use plates that are colder than room temperature..

it's a known fact that applying pressure to steel while grinding is gonna cause stuff to warp. Not to worry. Pad a vise with some aluminum pieces around the jaws and with the vise opened say around 1 thickness more than the tang itself, just work out the warp by putting the bend or whever in as far as where you see the warp and with some light pressure first bend it back to straight. I would NOT use a hammer right off the bat. Using a hammer will cause probably cause more stress and then you might end up with an actual bend instead of a warp.

The brass rod thing works well too.

It will happen again i'm sure, so plan on it and don't worry especially if it's not heat treated. I have even heat treated A2, noticed a warp, straightened a blade even below 400'F and NO Snapping !
Click to expand...

You're not supposed to put pressure on the blade when grinding it? :confused:
 
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