rivertoyz
starting to shine!
Member since November 2008
Posts: 27
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Post by rivertoyz on May 26, 2009 17:40:30 GMT -5
Hello. I have a 20" HP saw. I had used Covington's Rockhound oil. It is too thin. Now all of a sudden my blade is VERY HOT!!! Too hot to touch. Does anyone know if the oil is the problem or something else? Any advise on what would be the best oil to use? I am afraid the blade is shot now. It doesn't look good. I live in Needles, California. Where its hot to begin with. Please... :help: Thank you!!! Robin
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Post by catmandewe on May 26, 2009 18:51:38 GMT -5
Your blade should never be too hot to touch. Covington's oil is basically mineral oil, when the temperature is hot it may sling away from the blade too easily. Try adding some Bardahl "No Smoke" to the oil, it has an additive that thickens it up and makes it stick better, might help out. There is another additive that you can add to your oil to make it stick better, but the name escapes me right now. You can get it at most auto parts stores.
Good luck...............Tony
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
Posts: 20,463
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Post by Sabre52 on May 26, 2009 20:27:24 GMT -5
Wow! I lived in Ojai, CA where it's very hot in the summer though not Needles hot *L* and used the Covington oil for years with good results. It got warm but never real hot and seemed much better than the other oils I had tried because it filtered well and was not smelly. Actually, though kind of pricey, it was about the best oil I had found for my 20" saw. And thinner should be better, it's the oil running on and off your blade that cools and lubricates the cut . Lots of my buddies used to thin the oil even more with kerosene for even better results. I used to too but got a bit uneasy about using the more flammable kerosene. Thicker oil ( higher viscosity) is actually a bad thing because it holds more rock sludge and tends to drag and bind more in the cut and cools less because it does not run off and carry away heat as well....Mel
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Steve
has rocks in the head
Member since June 2005
Posts: 506
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Post by Steve on May 26, 2009 21:33:32 GMT -5
What are you cutting? Is your blade running true? Is the blade dished?
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rockdewd
has rocks in the head
Member since October 2007
Posts: 605
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Post by rockdewd on May 27, 2009 8:59:04 GMT -5
If your blade is running true and not dished I have a couple more suggestions.
Your blade might be glazed. Been cutting a lot of agates? I would dress the blade by cutting a couple slices from a grinding wheel or a brick.
Also, your blade may be worn and is not cutting a wide enough kerf for the rest of your blade to spin through. Take an old file and hit the blade on top of the cutting edge all around the blade with the edge of the file. This will expose new diamonds as well as flatten out or widen the cutting edge.
Rick
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Post by stonesthatrock on May 27, 2009 9:30:47 GMT -5
looks like they have answered everything for you. I use mineral oil, which i like the best and the price isn't too bad, Just recently i bought hydraulic oil, it seems thinner, and has a slight smell to it. Its the same price basicly so i may go back to the mineral oil. with either one of these i have never had the problem of the oil getting too hot and i live where its really hot out. .........mesa, az lol
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rivertoyz
starting to shine!
Member since November 2008
Posts: 27
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Post by rivertoyz on May 27, 2009 11:01:59 GMT -5
Is there a way to true the blade? Took it off and it has a slight dishing or bend, wobble, look to it. Not too bad though, but scared to use it. Can it be saved or do I need a new one? Thank you Robin
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Steve
has rocks in the head
Member since June 2005
Posts: 506
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Post by Steve on May 27, 2009 11:15:30 GMT -5
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Post by catmandewe on May 27, 2009 18:30:02 GMT -5
I turn my dished blades around so the dish is towards the rock and run them for a while, the rock as it pushes on the side of the blade will push the dish back the other way. When it starts binding up again it is time to turn it around again. That could be what is heating your blade up, too much friction on the blade if it is dished. You can hammer it back out, but sometimes just turning it around will work.
Good luck..............Tony
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Post by rockmanken on May 27, 2009 19:25:53 GMT -5
One other thing not touched on, you may be feeding the rock too fast. Will cause the blade to get hot. Ken
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Post by johnjsgems on May 28, 2009 0:21:31 GMT -5
All good advise. Not enough oil volume can cause overheating also. I've heard of people filling the tank with bricks to take up space and reduce oil volume needed. I'm guessing it is the dished blade. Always run feed at slowest rate also.
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riverbendlapidary
fully equipped rock polisher
Member since September 2006
Posts: 1,058
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Post by riverbendlapidary on Jul 21, 2009 17:59:53 GMT -5
Are you cutting flint by chance? That will heat any blade/oil combo up FAST!
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