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4just1don 06-18-2010 02:42 PM

life span of masonry diamond segmented blade
never used one before now. Cut a half dozen sidewalk edges to match depth. It is a 4.5"segmented diamond blade in an Dewalt angle grinder.

Pulled it out yesterday and cut two small sections and the blade has no grit left. It was right after I smoothed 2 quarter size rocks in the aggregate. Did the rocks ruin the blade or are they short life in nature???

ANY tips to longer life of blades appreciated

oh'mike 06-18-2010 03:37 PM

You might try a 7 1/4 inch blade for your Skill saw--I was using it with a dribble of water--Got over 70 feet of cut ,at full depth--the blade still has a lot of life.(not sure about the saw though:whistling2:)

If you try this make sure that you are plugged into a gcfi--and your saw and cords are grounded.

There are dry cutting blades in that size if dust is not a concern.
Heat is the enemy of diamond blades--life is much shorter when cutting dry.


4just1don 06-18-2010 09:04 PM

thanks for replying. What I am doing is grinding top of sidewalk slabs even. The sidewalk police were at work again and doesnt allow a 1/4" difference from one square to another. Tree roots and settling changes some slightly. If you 'drag' your toe from one to another it cant catch or jump.

There was NO directions with the wheel when bought. Its an Omega brand from Mennards,,,if that makes a difference.

So SHOULD one use small amounts of water to keep diamond blade cooler??and this would extend expected life?? Does that throw alot of goop?

can diamond blades cut/grind large quarter size rocks,,,or they too hard???

Bud Cline 06-18-2010 09:57 PM

That isn't a job for a low cost Chinese diamond blade to begin with. A diamond cup maybe!

Go buy a stone grinding cup for that grinder and do it that way. Menard's won't have one, try a real live construction supply company or go to a Ready-Mix company.:)

oh'mike 06-19-2010 05:37 PM

Sorry ,I misunderstood the use.

Like Bud suggested--a grinding cup is used for smoothing.----However,before attempting the final trim-
I would take that cutting blade and saw a series of shallow cuts (like you do when notching a 2x4)

An then knock off the slits with a hammer---That will get the bulk of the waste out of there fast--
Then use the cup to make the rough out look presentable.


FEDSAWDAVE 06-22-2010 01:37 PM

As was stated, water on a dry cut diamond blade will surely extend the life but there are also several variables: The quality of the diamond blade is obviously a concern. $16.00 Home Center blades vs a high diamond concentration on a blade that comes from a construction supply house $30-$50 dollars should be night and day differance. One of the biggest killers of a diamond blade is "elbow grease." In other words, using your strength to push the blade through the product instead of taking it slow and letting the diamond break down properly through the cut. Good way to warp a blade real quick. Variable speeds on slow starting out with diamond tooling will let you know how fast you can eventually go.

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