Home made gear cutting hobs part 6
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Uploader Comments (Hobbynut)
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Great video series, always inspiring!!
3 years ago 2
All Comments (7)
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Good video. I like the presentation and the large paper diagrams which help to explain the technique.
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Thanks for the info, I looked up the definition for case hardening and you are exactly correct. I guess I should have done a little more research here.
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Thanks for sharing your knowledge!
just one thing, what you're doing is not case hardening but a "normal" water hardening. Case hardening is what you do when your steel doesn't contain enough carbon (<0.3%) to harden in a normal quench by cooking the steel in an sealed box packed with a carbon rich material at above critical temp for quite some time and then quench. W1 steel has between 0.90% and 1.1% carbon so it does not need to be case hardened. Just wanted to clear up some terminology.
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Great video, One thing though,
your second process heating it up less hotter is not annealing. Annealing is when you heat it up to cherry red and then cool it slowly in a furnace.
The process you did is called tempering. It serves to trade a small amount of hardness to gain a huge increase in strength. Making it far less brittle.
YoshiKatt 2 years ago
Yep your right, I must have made a mistake in the video, Thanks for pointing that out.
Hobbynut 2 years ago
instead of water use something like engine oil ( for the carbon ) thats what i did. By the way TY 4 the vid i this is an easy method it helped me alot. I had to make a real big 1 45mm i think it ws for some pully my friend was making. TY again man
hewie2k7 2 years ago
I used water since I was using water hardening drill rod. Oil would be a good choice if you were using O1 or oil hardening drill rod. Thanks for the input
Hobbynut 2 years ago
I always enjoy your videos. Many thanks for taking the time to make them.
richieT737 3 years ago 3
Your Welcome, Give someone a fish and they will eat for a day, Teach them to fish and they will eat for a lifetime. I am glad I could help. Keep watching I am planning much more as time allows
Hobbynut 3 years ago