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Posted in response to Diamond sawblade operating temperature??? from Phil on September 07, 2010 at 09:31:40:

Re: Diamond sawblade operating temperature???

no not entirely, useing an oil bath saw. the problems with saw blades in an oil bath, is the heat of cutting the stones. offten times should a .065 or thinner saw blade experiance heavy use the blade warps from the heat of constant cutting. .065 or lower blades are very thin and can not take constant cutting. however saw blades greater then .065 are made for industrial use or heavy cutting, as a general rule. even so, even the thicker blades can experiance warping.

it is a good idea to keep the oil temp lower however. to encourage longar saw blade life. how ever small of a factor this might be. from trial and error, i have learned to have 2 blades on hand, and swap them out constantly, for i love to slab rocks almost non stop. some times my blades can get hot to the touch (not burning hot). this is past the time i should have swap out the blades and oil.

another factor to consider is the size of the stones we are slabing out. a larger stone can require longar cutting and the blade heats up a lot over a shorter period of time. there was a time i was concerned about the oil temp when my saw was outside. i removed the oil back to the can, and replaced it with cooler oil from another can, on 90 and 100 degree weather days. rapidly cooling the baldes is not a good idea. on hot days i use to set my blades out in the shade to promote cooling. my blades may have felt cool, but the aggitated molicules would argue that fact with me. try not to lay the blade down, keeping the blade standing up and on a stick in the arbor hole works for me. if you don't have that then stand the saw blade on a peice of wood. the wood dose not use heat transferance and the blade can evenly cool over a day.

as an example stones i am cutting now are of the 6.5 to 7.5 hardness on the mose scale. i plow through 20 cuts of stones in the range of one and 2 pounders. then i ither give the saw a breack for a few hours or change out the oil and blade to continue cutting right away (only takes a few mins). this prosses is anoing, but from trial and error i no longar burn out a blade every month. by blades last years now.

these saw blades that are made today are like memory steal. when a constant temp is applyed to them they begin to warp back to its "what to be state" before it was cold rolled and tempered in a foundry. it dose not hurt to ask steal blade manufacturers how they make there blades and then pick the one we belive to be the best.

metal ergie is a funnie creature. i only know of one steal that is both flexable and heat resitant. the prosses was invented hundreds of years ago and is still being used today. it can not be reproduced in a lab or in industry. it has to all be hand made from the fordge and hammer and is wicked expensive, and oddly enough coal is added to the blades at a specific time. over a period of 6 months the blade then has to undergo folding over and over again. at one time it was belived that the blades were folded hundreds of times. one day we may come up with a new tecknologie for makking A real flexable heat resistant blade, and not one that some one says it is. cuz there is no metal that dose not warp other then the one i am talking about.. but i do not see that happing anytime soon. lol the blades i was refering to are not stone cutting blades per say, they are called the katana-na-ta. or the samarie sword. i wish they would make a saw blade in that fassion. :) but the family that makes them keep it a closely gaurded secret today. and the skill is passed down for generations from father to son.

i have yet to see a rock saw blade not warp. when we are useing our blades it is the sound of the blade cutting that can tell us if the blade is beginning a warping prosses. the pitch of the blade produces a higher pich of sound when it is hot. when we become acustom to that pitch of sound thats when its a good idea to check the blade for heat. also the other sound to listen for is a new blade will sound like suuuuuuuuuuuuuuuuuuuuuuuuuu, a clean even sound while cutting., a warping blade will sound like suuut suuut suuuut suuuut and not a steady continious suuuuuuuuuuuuuuuuuuuuuuuuu. never stop the blade in the middle of a cut. this causes heat stress on the blade in a specific location and not universaly over the entire blade surface, and will cause warping as a faster event. what happens there is while the rest of the saw blade is cooling after stoping, the part where the blade is still in the stone is not cooling down as fast as the rest of the blade, that is where the heat stress originates from. and over time the blade will warp in that spot. i tryed an experiment on that one time and marked the blade where i stoped it in a 20 pound peice of jade with pin size marks using my dremil tool. i let the blade and oil cool down over 24 hours and then restarted the cut. in 6 months the spot i marked showed almost to the same spot i marked and the location of my blade warping. (hey! i have a lot of time on my hands so i doo weird experiments like that hehe). there is a place in california i sent my blades to 6 years ago for reconditioning. they will tell us if the blade can be reclamed or not with out cost. just the postage. forgot the name of that outfit. sorrie

there is another factor effecting the heat of the oil. and that is that of the slurry. when we have not cleaned out the slurry at the bottom, the slurry will store heat and release it slower there by keeping the oil warmer then it should be for a longar period of time. so cleaning out the saw chamber all the time is a good thing. i clean out mine once a week, with the amount of slurry i produce i should do it 2 times a week, but it is very mathodical cleaning, and i am not fond of doing it. i store my 5 gallon buckets of slurry for months. and as the slurry settles the oil in the slurry seperates to the surface, at which time i can drain out and reclaim that oil.

30 years ago my mom became so acustom to changing out the saw oil, that every time she used the lawn mower she swaped the oil out in the mower, hahahaha. i found that an endearing quality. it has not been but in the last ten years before i understood why she did that. back in them days there was no instrutional help as we have today, so some of us had to learn all over what was already known.

i hope my rambling on has helped you in some small way phil. your short question is a very good and important question.

From montana - September 08, 2010 at 08:09:49

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