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Here is my furniture class learning hardening and tempering.

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Blog entry by andyboy posted 848 days ago 3312 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

506 posts in 1833 days


#1 posted 848 days ago

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

1076 posts in 1137 days


#2 posted 847 days ago

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

-- If you can dream it, I can do it!

View andyboy's profile

andyboy

483 posts in 1871 days


#3 posted 847 days ago

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

4738 posts in 1440 days


#4 posted 846 days ago

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

-- Cau Haus Designs, Thomas J. Tieffenbacher

View andyboy's profile

andyboy

483 posts in 1871 days


#5 posted 846 days ago

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

4738 posts in 1440 days


#6 posted 845 days ago

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

View DocSavage45's profile

DocSavage45

4738 posts in 1440 days


#7 posted 845 days ago

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

-- Cau Haus Designs, Thomas J. Tieffenbacher

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