Advantages of laser tube cutting machines - TRUMPF

The economic pressure in conventional tube processing is increasing. The laser can save you entire process steps – and money too. At the same time, you can expand your range of parts and therefore your customer base. As a market leader in laser technology and the machine tool industry, we are the innovative trendsetters in the market, offering you perfect solutions when it comes to laser tube cutting.

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Link to HANMA LASER

As Rivits has said, cutting square tubing with a plasma is a poor choice, best to use a bandsaw, chopsaw and make sure you use a square to align the blades before you use them, accurate cuts can be done with either if you take the time to set them up. The PP50 can give good accurate cuts on plate if you use a guide strip, to get that on square tube you need to guide 4 sides, not worth the setup time for that when a chopsaw will give better results. The PP 50 is a great cutter that why I have one, I just don't use it for square tube unless I forced to.

One more thing; what should be discussed and hasn't been, is PREP AND FIT UP, GAPPING etc, prior to welding, precision cutting of material is not desirable prior to some welding joints, gaps are needed for proper welding in some cases etc..I'm sure we have some more experienced people on this site who add to the issue as to when to use gaps and other fit ups on different material thichness etc are required.

To get the MOST out of the PP50, turn the plasma down to about 30 amps. Then get a tri square (also known as a speed square or Johnson). Hold it on the mark, allowing compensation for the torch tip and kerf and use it as a guide. Just drag it across the metal. Flip the tubing and cut the next side. I've done several thousand feet of tubing cuts this way. Its fast and accurate enough. The thing to watch for is that your cuts will match up once you get to the fourth side. Starting on the edge and dragging toward you is safe and effective. With a little practice it will become a seamless motion. The torch arc should start on the radius of the tube, so it won't create much if any blowback.

Hi
Since a newbie asked I’m going a little outside this post to inject my opinion.
I hate chop saws and will not use one I do use a cut-off blade in an angle grinder as little a possible. I have used up a few band saws and a great number of blades for them. They produce residue that is very controlled and if the blade breaks it no big deal.
Chop saws produce great volumes of dust, sparks and smoke that go everywhere. That stuff is bad for your health, it stinks and in some instance could be a fire hazard. Start off right and buy a metal cutting band saw the cost is not that much more and the blades last longer if you get good ones.

Have fun
Tom

IF you want a good one for a cheap price, here is the one I bought to use. (and subsquently loaned out my taiwan made HF to a friend). The metal never moves to cut angles. That's a space and time saving feature. The head does and it has a nice cam tightening vice. After having the kind you have to swing the metal all around its very nice, and angle cuts are made accurately with a degree by degree scale and pointer. The ONLY complaint is that the idler wheel is a bronze bushing instead of a bearing...But the guides and everything are much heavier. I think the bushing is oil impregnated, but I put a shot of lithium up there every once in a while anyway. So far no problems...Oh and when/if you get it, it can be coaxed to cut 6 inches. http://www.agrisupply.com/product.as...&sid=&eid=