Changes between Version 9 and Version 10 of CraftRoboReflow_e


Ignore:
Timestamp:
Sep 13, 2012 7:54:42 PM (7 years ago)
Author:
maki
Comment:

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  • CraftRoboReflow_e

    v9 v10  
    6767A lot of people try to prepare stencils in-house, e.g., http://www.ladyada.net/library/smt/laserstencils.html, and http://www.instructables.com/id/Create-Solder-Paste-Stencils-with-Cricut/. However,  these methods still have some problems as followings;
    6868
    69   1. low accuracy
    70   2. requires expensive machines (e.g., laser cutter) and/or poisonous materials (e.g., the polyimide film)
    71   3. requires time and troubles to setup stencil data and/or the machine
     69 1. low accuracy
     70 2. requires expensive machines (e.g., laser cutter) and/or poisonous materials (e.g., the polyimide film)
     71 3. requires time and troubles to setup stencil data and/or the machine
    7272
    7373To solve these problems, we made trial-and-errors using 4 methods and 6 materials.
     
    7676We visited one of FabLab in Japan, and used a laser cutter to try cutting PET-film and polyimide film.
    7777
    78  * PET-film
    79 The cutting edge swells up, and the heat of laser may fill the holes again.
     78 * PET-film[[BR]]
     79 The cutting edge swells up, and the heat of laser may fill the holes again.
    8080
    81  * Polyimide film
    82 Polyimide film emits poisonous gas under high-temperature. The cutting edge is not straight.
     81 * Polyimide film[[BR]]
     82 Polyimide film emits poisonous gas under high-temperature. The cutting edge is not straight.
    8383
    8484The laser cutter is expensive but cannot be used for fine pitch PCB design.
     
    8787We used a CNC milling machine to try cutting a phosphor bronze plate.
    8888
    89  * Phosphor bronze plate
    90 The cutting edge wells up.
     89 * Phosphor bronze plate[[BR]]
     90 The cutting edge wells up.
    9191
    9292The hole size and  the diameter of the corner depend on the endmill diameter. The larger endmill is proper for high-speed manufacturing and slow degradation of endmills, but it is not proper for fine pitch PCB design. The small size endmill easily degrades and it is expensive.
     
    9595We tried cutting 4 kinds of materials, PET-film, vinyl chloride sheet, laminate film, and polypropylene synthetic paper using a cutting plotter named Craft-ROBO (made by Japanese company GRAPHTEC).
    9696
    97  * PET-film
    98 The rigidity of the PET-film makes it easy to be broken, and the neighboring pads easily get together. It cannot be used for fine pitch PCB design. And our Craft-ROBO could not cut out if thicker than 100um (micro-meter).
     97 * PET-film[[BR]]
     98 The rigidity of the PET-film makes it easy to be broken, and the neighboring pads easily get together. It cannot be used for fine pitch PCB design. And our Craft-ROBO could not cut out if thicker than 100um (micro-meter).
    9999
    100  * Vinyl chloride
    101 It stretches easily, i.e., the accuracy is low. It is weak against alcohol.
     100 * Vinyl chloride[[BR]]
     101 It stretches easily, i.e., the accuracy is low. It is weak against alcohol.
    102102
    103  * Laminate film
    104 Laminate film is the double-layered film of PET-film and vinyl chloride, generally used for laminate pouches. It is difficult to cut completely because the vinyl chloride layer is soft, but the accuracy is not so low. However, it tends to tear easily.
     103 * Laminate film[[BR]]
     104 Laminate film is the double-layered film of PET-film and vinyl chloride, generally used for laminate pouches. It is difficult to cut completely because the vinyl chloride layer is soft, but the accuracy is not so low. However, it tends to tear easily.
    105105
    106  * Polypropylene synthetic paper
    107 Polypropylene synthetic paper is paper like sheet made of polypropylene fiber. It is easy to cut completely, of course it is a paper, i.e., the accuracy is high enough. It is just paper, but it is difficult to tear by hands, i.e., it is tough enough for stencil use. It has good resistance to alcohol and water.
     106 * Polypropylene synthetic paper[[BR]]
     107 Polypropylene synthetic paper is paper like sheet made of polypropylene fiber. It is easy to cut completely, of course it is a paper, i.e., the accuracy is high enough. It is just paper, but it is difficult to tear by hands, i.e., it is tough enough for stencil use. It has good resistance to alcohol and water.
    108108
    109109Based on the results, we chose the cutting plotter and polypropylene synthetic paper.
    110 現在のところそれぞれ上記のような理由で、ポリプロピレン合成紙を使用しています。[http://www.switch-science.com/products/detail.php?product_id=822 ポリプロピレン合成紙はこちらからご購入]いただけます。
     110[http://www.switch-science.com/products/detail.php?product_id=822 Polypropylene synthetic paper is available here!]
    111111
    112112== cream-dxfの工夫点 ==