Waterjet cutting

Discussion in 'Saw Makers Forum' started by fred0325, Apr 23, 2013.

  1. fred0325

    fred0325 Most Valued Member

    Messages:
    1,084
    Hello all,

    I should perhaps stay away from technical matters but I saw an example of waterjet cutting just recently and when I got the chance to talk to the person who had it done, I thought that it may be applicable to cutting teeth on saw blades, or indeed, the blades themselves.

    There are two types of cutting as far as I can see, pure water and water plus an abrasive, usually garnet grit. The water + abrasive has a cutting tolerance of about 0.8mm and which is not sufficiently tight for saw teeth, but with water only I think that you can get down to 0.2mm and which is a lot better in terms of accuracy.

    It produces no heat and purportedly does not distort the plate. (Therefore no need for secondary "smithing" or "tensioning"). It also cuts reasonably accurately up to 50mm of steel and multiple items can be cut at the same time to reduce cost, a consideration if you are producing new saws.

    I thought of it, not in terms of new saws but in converting the plethora of old rip saws into usable crosscuts. You could both joint and re-cut the saw using this technique. I suspect after seeing some of the intricate work done on various internet sites that it may be possible to put the fleam on as well as the rake, to the same accuracy so that filing, if any is needed is kept to a minimum.

    I am also told, however that this technique is best on a "blank canvas" and is not so good at working with existing shapes, so that amending teeth numbers or shapes would not be possible.

    Is there anyone out there already doing this? Or anyone who knows the cost which I suspect may be prohibitively expensive.

    Or just anyone with any ideas on it.

    Fred
     
  2. lui

    lui Most Valued Member

    Messages:
    77
    Hi Fred,

    It's been a while, I never have enough time to post, but I do stop by on a regular basis.

    The Water cutting is something that I've been asked to look at, by a couple of people. I've been asked about 2 man cros cut saws, large pit saws and japanese pull saws, I'm not geared up for any of these and have stated to look into water cutting. I don't have prices yet, and your idea of stacking blades is very interesting.

    If anything comes of it I'll let you know.

    regards

    lui
     
  3. TraditionalToolworks

    TraditionalToolworks Most Valued Member

    Messages:
    181
    I've heard the teeth of the plates on Adria saws are water cut.

    Rumor has it Eddie has it done in Japan.
     
  4. Kermit

    Kermit New Member

    Messages:
    1
    Some answers

    I am thinking about it. Indeed I am preparing designs.

    A few issues I do know the answer to. Stacking is a no go. The stream spurts sideways between layers and erodes the sheet faces. There is little heat generated and the water cools everything very quickly, it is the best way to cut hardened steel. Rip filing can be achieved on any machine but few can do angled cuts so no cc. Oh, and the process leaves one hell of a burr on the Bottom side.

    Cutting at techshop runs $2 a min for pump run time but the cuts are fast so the final price should be reasonable. Not sure what you might pay to have someone do it for you.

    If you are near a techshop or other member workshop you might check if they have a water jet and get their take on capabilities. I do not plan to use it for small saws so I was not concerned about resolution (your accuracy) but I think it is less of a problem than you seem to feel it is. Indexing is an issue. I will be working from sheet stock and cutting the whole saw in one go. Recutting an existing saw would be a scary to do accurately. On the whole, I think jets are best suited to doing large saws not backsaws.




    Disclaimer: I am a techshop member-instructor. Not shilling for them here just happen to know the run costs they charge.