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Tool Talk Discussion Forum

Cooling liquid for grinder

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Hillbillyjohn

01-07-2007 12:20:59




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If you are sharpening drill bits, knives and such, water is probably the first thing that comes to mind. But the shop gets cold and sometimes freezes. I would like a small metal pot by the grinders to cool the bits,etc. Does oil cool as well and as fast as water and what type of oil would you use? Hy,motor,cutting,WD 40, or any other type of oil?




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dan hill

01-08-2007 04:42:42




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 Re: Cooling liquid for grinder in reply to Hillbillyjohn, 01-07-2007 12:20:59  
I sharpen tools and dont grind so that steel over heats.Planer blades and saws take time and wheel choice is important.



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jeffcat

01-07-2007 22:42:22




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 Re: Cooling liquid for grinder in reply to Hillbillyjohn, 01-07-2007 12:20:59  
Hot metal in water will give you a "Quench" temper. Very hard and brittle. Oil will hold the heat and you get a much more usable temper or keep what you have. I have the metal book somewhere around that a friend gave me about this stuff and it is a real mind bender of a read! Jeffcat



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Dusty MI

01-07-2007 17:02:48




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 Re: Cooling liquid for grinder in reply to Hillbillyjohn, 01-07-2007 12:20:59  
Once one cold winter day on an unheated hosiptal construction job, a couple of guys were try to sharpen a drill bit. It was so cold it didn't need any coolent. but it would chip as soon as they tried to use it. I looked at it and dipped it in cutting oil at the threading machine before sharping. It drilled holes very well after that.

Dusty



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RustyFarmall

01-07-2007 13:54:10




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 Re: Cooling liquid for grinder in reply to Hillbillyjohn, 01-07-2007 12:20:59  
Windshield washer fluid works quite well and does not freeze. I use it in my Black and Decker Valve grinder.



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old

01-07-2007 13:40:47




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 Re: Cooling liquid for grinder in reply to Hillbillyjohn, 01-07-2007 12:20:59  
Oil works just fine and any oil will work. My self I use, used motor oil. Also would you believe that useing oil is better for cooling tool steel then water is, something about water makeing thing brittle and oil not do that as badly. I.E if cooled in water the tool is more likely to crack or chip

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Eddie in MI

01-07-2007 19:17:30




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 Re: Cooling liquid for grinder in reply to old, 01-07-2007 13:40:47  
No kidding? I didn't realize that about oil and water. I'll have to save myself some old motor oil....



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dan hill

01-08-2007 04:49:50




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 Re: Cooling liquid for grinder in reply to Eddie in MI, 01-07-2007 19:17:30  
Drain oil is bad stuff.Read the warning on oil bottles.I buy new oil for 1.50 a quart.Drain oil should go into waste oil burners.



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old

01-07-2007 19:25:09




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 Re: Cooling liquid for grinder in reply to Eddie in MI, 01-07-2007 19:17:30  
Another one of those things I learned from an old retired machinist. As far as the oil how many gallion do you need, I have 2 55 gallion drums full or almost full of the stuff.



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