Cutting .250+ Aluminum

[Drools]

This weekend I purchased a Freud non-ferrous metal blade.
Putting my fears a side I grabbed the WD-40 and some clamps. After clamping the 1/2 x 3 aluminum bar to the chop saw, I started cutting.
The finished cut was fantastic; I just went slow and made sure the WD-40 was being used to lube the blade. After the bar I trimmed up some 1530 series 80/20 with the same results, I should have purchased one of these when I first started this project!

[Geof]

Was this a blade with the laser cut squiggly slots filled with a rubbery compound to dampen vibration? (Excuse the highly technical terms.)

With the material correctly clamped and the blade fed at a sensible speed you can get a very good finish and very good precision with a chop saw.

[Drools]

Yes the blade has the squigglies you are mentioning. It is also a bright RED in color. The same blade is good for plastic and I did try a 2" thick piece of plastic with the same results.

[FandZ]

Originally Posted by Drools Yes the blade has the squigglies you are mentioning. It is also a bright RED in color. The same blade is good for plastic and I did try a 2" thick piece of plastic with the same results.

is this it? http://www.toolmarts.com/frd_p410.html

[stevespo]

I can't say what Drools is using for a blade, but the P410 is a general purpose combination blade with Hi-ATB (alternating top bevel). This will certainly cut aluminum, but the high bevel is not ideal for that purpose.

My Freud non-ferrous blade is a D1080N, which is a TCG (triple chip grind) with a negative rake angle. This is more typical of (soft) metal cutting blades. I've left this in my chopsaw, because it also works well for crosscutting wood. About $60 online.

Steve

[Drools]

I just looked at the model # of the blade and it is the D1080N. 80.00CAD + taxes for the 10" version at homedepot.

[FandZ]

They have it on amazon too.

Amazon.com: Freud D1080N Diablo 10-Inch 80 Tooth TCG Non-Ferrous Metal and Plastic Cutting Saw Blade with 5/8-Inch Arbor and PermaShield Coating: Home Improvement

Amazon.com: Freud D1080N Diablo 10-Inch 80 Tooth TCG Non-Ferrous Metal and Plastic Cutting Saw Blade with 5/8-Inch Arbor and PermaShield Coating: Home Improvement

Thanks for the info. I have a cut off saw and it did terrible with the big disc I bought for it. It would melt the metal and leave behind a kind of smudged finish.

[analogman]

I just use a finish wood carbide tip blade (50 teeth) on the table saw. Works fine - up to 1" aluminum. Needs to be milled for a nice finish, but just fine for rough cuts. Go slow. Hot chips require a full face mask.

[Drools]

Interesting that you mention "hot chips" I did not find that a problem with the D1080N, the negative angle on the cutting teeth help to reduce heat. I used the same plade to cut 2" plastic without a hint of melting.
I have seen some saying that just reversing a fine cut blade works to but I do not like the idea of reversing a saw blade.

[analogman]

I have used the reverse the saw blade thing for thin plastic and it works fine. For thicker stuff (1/4" or greater) I just run it through as normal.