Cutting thick aluminum stock

skipd1

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I have some thick stock of aluminum that I recieved from a friend in a small CNC Mfg company. Its basically 4"x4"x4" and 4"x4"x2" blocks. Today I tried to slice a 1"X1"x4" piece off one of the blocks with my jet 4x6 band saw. I have had wonderful cuts and performance with this little band saw with steel. I assumed it would cut equally well on aluminum. I started without changing the blade speed and even used some WD40 for lub, but it seemed to take forever to progress into the metal. I then changed the speed to the fastest setting and found the cutting was somewhat faster only by adding down pressure to the saw. After I progressed about 3/4 way thru the cut it was apparant that the cut was creeping out and making a terrable belly in the cut to the extent that I had to readjust the clamp on the parent block. I did cut this material in the horizontal position of the block assuming that the most teeth in the cut was best, but maybe I should have cut it vertically and been more patient!!!!!. I made the poor asumption that the saw would cut aluminum faster that steel..... What do I know.
Is there a methodology for cutting thick aluminum, and can it be done accurately with this tool? I am also using a high quality, fairly new Bimetal variable pitch blade(Lenox). I also did not notice any material buildup on the teeth of the blade that would reduce its effectiveness.
Skipd1
 
I have the same saw with no problem
how many teeth per inch are you using they may be too fine and clogging before exiting the part i'm using 14 and i need to go to 12 for aluminum
steve
 
Aluminum likes to be cut at the same speed as wood, so I always use my wood cutting band saw, which runs at 3000 FPM, more than ten times the highest speed of my metal saw. I use a 6 TPI blade for most stuff, but if I have a lot of deep cutting, I'll go to 3 or 4 TPI, and bit of paraffin touched to the blade keeps the teeth from loading.
 
You likely need coarser teeth and faster speed,as said. BUT,there are just some grades of aluminum that are horrible to cut. I had that experience with some unknown aluminum alloy on my Roll In saw,with PLENTY coarse teeth. Other grades cut just fine with the same blade. I don't know what alloy the stuff was. I don't use a lot of aluminum in my work,so I'm no expert.
 
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