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Why can't you cut ferrous metal with a DeWalt mitre saw (model DW716)?

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Forum topic by Sandyegg posted 02-11-2008 08:08 AM 1541 views 0 times favorited 4 replies Add to Favorites Watch
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Sandyegg

4 posts in 3840 days


02-11-2008 08:08 AM

Hello all.
Have a question…I need to cut a number of powder-coated galvanized steel rails and was thinking about using my mitre saw with an abrasive metal cutting blade by Hilte. I need to get a nice clean cut to finish a project and thought the mitre saw would do a better job than a hack saw. Then I took a look at saw’s manual and it advises against cutting any ferrous material and to not use an abrasive blade. Can anyone tell me why?
Thanks in advance for your responses!


4 replies so far

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GaryK

10262 posts in 4070 days


#1 posted 02-11-2008 08:14 AM

Didn’t you ask that already?

-- Gary - Never pass up the opportunity to make a mistake look like you planned it that way - Tyler, TX

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Dadoo

1789 posts in 4073 days


#2 posted 02-11-2008 02:00 PM

It’s because of the plastic blade guard. Metal cutting produces and throws a ton of hot slag around. What you need is a metal cutting chop saw.

-- Bob Vila would be so proud of you!

View markrules's profile

markrules

146 posts in 4197 days


#3 posted 02-11-2008 02:19 PM

Sort of.

DeWalts model 872 is designed for cutting steel and has a plastic guard (poor design in my book). Metal can only be cut with a toothed blade if the saw is designed for it (low RPM, high torque). Miter saws aren’t designed for this. The motor and it’s parts aren’t sturdy enough to handle the forces needed to repetitively cut steel. As to why they’d advise against using an abrasive wheel is anyone’s guess. The speed should be fine.

Depending on the thickness involved, I’d pick up a Metal Devil blade from Northern Tool, Fastenal, or Grainger (coming soon). It’ll fit your 7 1/4” saw and will give you a very good cut (albeit a shorter blade life than with a metal saw).

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Thos. Angle

4444 posts in 4044 days


#4 posted 02-11-2008 04:36 PM

I answered in the other post

-- Thos. Angle, Jordan Valley, Oregon

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