Question about RTO 20 14" Abrasive Chop Saw Blades Metal Cut-off Wheels

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I have a electric chop saw I use for gutting 41 x

I have a electric chop saw I use for cutting 41 x 41 galv channel. sometimes it just wont cut and seems to burn its way through leaving great big burrs

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David, If the only variable is the material and not different blades, different operators, different feed rates --- then the variable is just that, the material. Abrasive cutoff wheels actually work best on somewhat hard materials. They will make big burrs (this is known as galling) when used to cut softer material. And once a wheel starts to do this, it will tend to load up (just like fine sandpaper does when sanding a painted surface) - and this loading up will cause more galling and poor performance. You might be able to intervene by dressing the wheel. You might be able to do that with a carbide tool insert held in locking pliers. The variability of your galvanized channel can be come from the steel itself being softer sometimes, but might be mostly due to the varying thickness of the zinc plating (which is what galvanized is). Zinc is very soft. I hope you find this helpful. Al Kupchella

Posted on May 14, 2010


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