lsmike
spending too much on rocks
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Maxwell's demon lowers tumbling entropy
Member since January 2007
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Post by lsmike on May 9, 2007 19:59:21 GMT -5
;DI just replaced my 80 grit plated diamond with a sintered 80/120.What a difference!!I roughed out a 6 ounce agate nodule in fewer than ten minutes including removing pits up to about a 16th. inch deep.I'm guessing this would have taken an hour on the old wheel.It cuts so aggressively that it was impossible not to create flat spots.Of course these can be taken out on the 180 wheel or with 60/90 in a rotary.The maker suggests ordering one step higher than a plated,e.g.,80/120 rather than a 60;I can see why! Mike.
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RockyBlue
fully equipped rock polisher
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Go U.K.
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Post by RockyBlue on May 21, 2007 11:44:25 GMT -5
A "dummy" question,what is a Sintered Wheel?,I have learned a lot from dummy questions,..Rocky
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MichiganRocks
starting to spend too much on rocks
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"I wasn't born to follow."
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Post by MichiganRocks on May 21, 2007 18:03:08 GMT -5
A "sintered wheel" or a "sintered blade" are made of steel with the abrasive material dispersed all through the steel. The cheaper blades are plated, where the abrasive is just plated on the surface. They are called "sintered" because they are made of powdered steel with the abrasive mixed in, and then pressed under very high pressure to reconstitute the steel, with the abrasive in it. Using powdered metal is a way to combine materials that ordinarily couldn't be combined by melting them together. That is also why you can sharpen a sintered blade by cutting a piece of grinding wheel. It rips away the steel and exposes new diamond, which is harder than the wheel.
Hope this helps.
bd
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turnedstone
freely admits to licking rocks
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Post by turnedstone on May 21, 2007 18:42:04 GMT -5
Thanks Ron did not know this great info. George
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RockyBlue
fully equipped rock polisher
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Go U.K.
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Post by RockyBlue on May 21, 2007 18:51:59 GMT -5
It helped a bunch,Thanks.........Rocky
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lsmike
spending too much on rocks
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Maxwell's demon lowers tumbling entropy
Member since January 2007
Posts: 468
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Post by lsmike on May 21, 2007 19:21:37 GMT -5
:)I didn,t know either,but it was explained to me that it is a different way of attaching the diamond-in- matrix to the wheel than the "standard" plating method.It involves heating the mixture almost to the melting point of the brass in it.This makes a very strong bond so that you can cut "till it seems to be worn down like a plated wheel[matrix and diamond almost gone],but you can then dress it by running an A.O. stick against it and bring it back to the original aggresivness.I believe the upshot is that a plated wheel is shedding good diamond because of the weaker bond.The same is true of sintered burs and sawbladesJust noticed Blaidd drwg's reply which is pretty much the same,so I'll just add that if you plan to do a lot of work sintered is cheaper in the long run.Mike.
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