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Here is my furniture class learning hardening and tempering.

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Blog entry by andyboy posted 03-29-2012 04:01 AM 3714 reads 1 time favorited 7 comments Add to Favorites Watch

Hardening and tempering a plane blade.

-- Andy Halewoodworker. You can't finish if you don't finish. So finish it, because finish is everything.



7 comments so far

View Jimi_C's profile

Jimi_C

507 posts in 1988 days


#1 posted 03-29-2012 11:13 AM

Interesting, I had read that tempering in an oven was a good way to do it too. Seems like it might be a little easier than doing it by eye with the torch. Was the second dunk just to cool the metal quickly so it didn’t lose its hardness? None of the articles I’ve read called for a second quench, and since the metal wasn’t red hot I doubt it was to add any carbon.

-- The difference between being defeated and admitting defeat is what makes all the difference in the world - Upton Sinclair, "The Jungle"

View Philip's profile

Philip

1154 posts in 1292 days


#2 posted 03-29-2012 05:37 PM

That’s great. What concoction do you use the dip it in the first time?

-- I never finish anyth

View andyboy's profile

andyboy

501 posts in 2026 days


#3 posted 03-29-2012 11:25 PM

The first dunk is in oil. The oil needs a low flash point or poof, youv’e got too much of the hot stuff.
We were putting them in the water at the end only to handle them. Not wise as if too much heat left in the steel can make the steel brittle.
So be patient and for best results let the oil cool the steel.

-- Andy Halewoodworker. You can't finish if you don't finish. So finish it, because finish is everything.

View DocSavage45's profile

DocSavage45

5371 posts in 1595 days


#4 posted 03-30-2012 03:22 PM

Other than steel color, do you have a way to measure hardness?

-- Cau Haus Designs, Thomas J. Tieffenbacher

View andyboy's profile

andyboy

501 posts in 2026 days


#5 posted 03-31-2012 09:56 AM

No Tom. Sorry but I am as green to this as my students. If the straw colour or color as you guys spell it, is achieved in an oven it is a lot easier to control.

-- Andy Halewoodworker. You can't finish if you don't finish. So finish it, because finish is everything.

View DocSavage45's profile

DocSavage45

5371 posts in 1595 days


#6 posted 03-31-2012 02:26 PM

As much of a tech guy as you are. i thought there might be a tool? :) Did something similar in high school. We also use to add carbon powder? It was a school for technology and college prep, but it was a long time ago? LOL!

Guess the best way of knowing if it’s hard enough is keeping an edge?

-- Cau Haus Designs, Thomas J. Tieffenbacher

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DocSavage45

5371 posts in 1595 days


#7 posted 03-31-2012 02:27 PM

Then again the torch you are using is pretty high tech.

-- Cau Haus Designs, Thomas J. Tieffenbacher

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