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Old 02-09-2010, 01:15 PM   #1
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Cutting granite


I bought a cheap wet saw the other day and a diamond blade. I practiced on some cheap granite tiles I got a home store for about 2 bucks a piece.

The saw cut the tiles pretty good, but there were small chips on the finished edges. What causes this? Is it the saw, the blade, my technique, or maybe I have a low grade of marble? What is the best way to get clean edges, and is this something thatís unavoidable?

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Old 02-09-2010, 01:16 PM   #2
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I said marble there but I meant granite.

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Old 02-09-2010, 01:25 PM   #3
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I bought a cheap wet saw
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I practiced on some cheap granite
You will notice that your granite tiles coming out of the box have a fine chamfered edge on all of them. Why do you suppose the chamfer is there?
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Old 02-09-2010, 02:52 PM   #4
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I don't know, why?
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Old 02-09-2010, 02:56 PM   #5
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Are you implying that the chamfer is to cover up chips? So are you saying that it's normal to chip? If so, what are you supposed to do about the chips? Do you have to blend them out or will sealer seal them up? Iíve never been good at solving mysteries.
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Old 02-09-2010, 03:01 PM   #6
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I think what Bud was indicating was that chips are a common occurrence. I would guess the cheaper tiles and perhaps the cheaper tile saw don't help.

Just how big are these chips you are talking about.

I think what tilers do is take off the sharp edge with a stone of some sort. This would help to disguise some of the chips.

But hey, what do I know.
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Old 02-09-2010, 03:23 PM   #7
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Chips are not that big. That's what I'm trying to figure out though, if it's worth getting a better saw or if the chipping is normal. How would you blend these out? I know you can do it with polishing pads, but I don't have any. Is there another way?
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Old 02-09-2010, 03:38 PM   #8
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Originally Posted by drtbk4ever View Post

I think what tilers do is take off the sharp edge with a stone of some sort. This would help to disguise some of the chips.

I don't know for sure what type of stone, but they kinda look like the honing stones for axes etc.
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Old 02-09-2010, 06:02 PM   #9
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Sorry, I thought my earlier comment would suffice.
Places like Bass Pro Shops and Cabela's and Ace Hardware sell a diamond pocket knife sharpener. That's what I use. The "black" one is best and most aggressive. The stones like the one shown above work but on granite it takes a lot of rubbing. On dark stones the filed edge will turn white from the abrasions. To polish this out requires polishing pads of various grits. In most cases a stone enhancer type sealer will darken the abrasion. You'll notice the chamfer is about 1/16" wide, typically that's all it takes to rid the chips. A regular knife sharpening stone can also be used but the diamond products work the quickest.

Granite is sold for its hardness/density among other characteristics. The softer granites (may not be true granites) and are softer in density and therefore easier to quarry and polish and hence "cheaper" to buy.

The big box saws aren't known for their quality in any aspect. Mostly they produce low RPMs under a load and they vibrate like crazy. Maintaining the proper and consistent RPMs and controlling vibration is tantamount when cutting most natural stones, hence, cheaper to buy.

Bottom line is you get what you pay for.

Hopefully this post is an improvement over my last one.
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Old 02-09-2010, 07:26 PM   #10
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Bass Pro Shop - Your #1 Tile Supply Store!!!!!
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Old 02-09-2010, 07:39 PM   #11
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Bass Pro Shop - Your #1 Tile Supply Store!!!!!
What can I say?
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Old 02-10-2010, 03:01 AM   #12
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whatever works, Bud. not judging, just kiddin'... for example, when i do a prefinished glue down, i put a sock over my mallet so that it doesn't mark the wood....Hanes ankle-high works great!!!!!
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Old 02-10-2010, 07:38 AM   #13
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' cheap wet saw the other day and a diamond blade ' is the 1st thing,,, many times the arbor doesn't spin ' true ',,, any wobble'll be manifest'd as chips,,, 2nd point's the blade - granite requires a specific segment matrix - yours is probably not correct.

its not the grade of the mtl being cut - its the cutting equip & technique !
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Old 02-10-2010, 10:16 AM   #14
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Some diamond blades don't stay round for very long either. Diamond blades tend to wear in the same manner that pot-holes are formed. The more they are used the more they tend to deform.

The repeated and constant act of the blade touching the stone then not touching the stone then touching the stone again and again takes its toll on the material and the blade. Diamond blades can run "out-of-round" and go unnoticed all the time.
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Old 02-10-2010, 05:59 PM   #15
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bud's experience & knowledge certainly need no validation from anyone as he's absolutely right,,, btw, the blade used for marble differs from a granite blade as marble's softer & more abrasive than granite,,, similar to ' green ' vs cured.

you'll not get those choices at apron stores but only from companies such as diamond products, etc - pro blade makers.

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