I find it almost impossible to grind on my blades (belt sander) without overheating the edge or tip of the blade. I am seeing some youtube videos where "professional" knifemakers are doing the majority of grinding after heat treat. How is this possible without a constant flow of coolant over the blade-which I dont see them doing. I get my grind as close to finish as possible then heat treat and then no power tools. I am just learning here...? Thanks
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Blade grinding after heat treating.
- Thread starter BCVS
- Start date
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- Sep 29, 2015
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- 487
You’ll want to post questions like this in the shop talk sub forum, under knife makers discussion.
What steel specifically are you working with? And what steels were being used in the videos you’re referring to? Some steels temper at higher temps than others.
Also are you dimensions the same as the knives your watching being made in videos? If your knives are thinner, or have a finer tip then it’s going to over heat faster. But usually applying lighter pressure and dipping in water between passes on the grinder prevent over heating.
And when you say you are over heading your steel is it changing color or just becoming hot to your hand?
Another factor that can contribute to this is if you are using a new or heavily used belt. A used belt is going to cut less and just produce more friction. You want to be sure to use new belts for finish grinding and worn belts for initial profiling.
What steel specifically are you working with? And what steels were being used in the videos you’re referring to? Some steels temper at higher temps than others.
Also are you dimensions the same as the knives your watching being made in videos? If your knives are thinner, or have a finer tip then it’s going to over heat faster. But usually applying lighter pressure and dipping in water between passes on the grinder prevent over heating.
And when you say you are over heading your steel is it changing color or just becoming hot to your hand?
Another factor that can contribute to this is if you are using a new or heavily used belt. A used belt is going to cut less and just produce more friction. You want to be sure to use new belts for finish grinding and worn belts for initial profiling.
Ok. Thanks for the reply. I am using 01 tool steel usually 1/8 or 3/16 thick. It will change color. I see your point about using worn belts. Also, my belt sander is not variable speed so I can't slow the belt speed down. It runs at 3600 RPM with a 5 inch drive wheel.
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Light pressure, low speed, aggressive abrasive and coolant dips.
115Italian
Gold Member
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- Nov 13, 2015
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If you’re heat treating after grinding, is the edge being over heated during the heat treat? It’s a lot thinner than the rest of the knife.