press_fit_cn

Press-Fit Construction Tips

嵌合式结构提示

About Press-Fit Contruction

关于嵌合式结构

Press-fit construction is also known as interference fit or friction fit.: http://en.wikipedia.org/wiki/Interference_fit

Press-fit construction/嵌合式结构 也被称作interference fit 或者 friction fit

This Week's Assignment:

本周任务:

The assignment for this week is to create a press-fit construction kit: http://academy.cba.mit.edu/classes/computer_cutting/index.html 本周任务是制造一个嵌合式结构套件

Press-Fit Construction Tips [excerpt, by Shawn Wallace]

嵌合式结构提示 [由Shawn Wallace摘录]

Fairly precise cuts are necessary in press-fit construction, in the thousandth-of-inch range. Although the laser cutter is a very precise tool, you’ll still find a measurable variance in kerf (i.e. width of material removed) depending on the material, the state of the optics, and the quality of the air exhaust. You’ll also find that off-the-shelf sheet material like plywood usually varies from piece-to-piece by +/- .005 inches or so.

嵌合式结构需要相当精准,在千分之一的英寸误差范围. 尽管切割机是非常精准的工具, 你会发现可测量的切口偏差，这是是由于不同的材质 (i.e.去除材料的宽度), 光学的状态, 空气排放质量导致的. 你也需要现成的材料如0.005英寸的夹合板

Because you will inevitably have to tweak a press-fit design to match the materials and equipment at hand, your design should be created so that the width of slots and notches can be changed parametrically. It’s also important to chamfer (i.e. cut at a 45 degree angle) the edges of the press-fit notches. Without a proper chamfer, you may not be able to slide the pieces together to get an effective joint.

你需要调整嵌合式设计去匹配材料和设备.你设计的插槽和缺口的宽度应该是能够参数化调整的。嵌合式插口的斜切非常重要（比如切45度的角）.没有斜切，你就不能有效的把部件连接在一起

Inkscape is a great open source vector drawing program. When designing for the laser cutter, thin red lines cut and black/grey values are engraved. Note the chamfers… Inkscape是一个很好的开源矢量绘图软件,当为激光切割设计文件时，红色的细线作为切割，黑色和灰色的值用于雕刻.注意图形上设计的斜角...

Full-featured CAD programs, like QCad, make it relatively easy to parameterize parts, but it’s also possible to use Inkscape to make parametric designs using the clone tool. First, follow these steps to determine the base size of a press-fit notch: 全功能的设计软件像QCAD，相当容易的去进行参数化设计,但Inkscape也有可能用clone tool进行参数化设计。首先，按照下面的步骤去设计嵌合式缺口的基本尺寸：

  1. With calipers, measure the kerf created by your laser cutter. Cut a square, then measure the inner dimension of the hole and the outer dimension of the piece. Subtract and divide by two: this is the kerf for that material.
  2. Measure the thickness of the material, preferably with calipers.
  3. Use these measurements to draw your best guess for a notch
  4. Duplicate the notch a few times and bracket in .001 inch increments (i.e., make some at w-.002″, w-.001″, w+.001″, w+.002″ etc.).
  5. Cut and test the fit
  1. 你可以用游标卡尺测量激光切割产生的切口。切割一个正方形，然后测量孔的内尺寸和切割产出物的外尺寸。相减除于2：这是材料的切痕的尺寸。
  2. 测量材料的厚度，最好用游标卡尺.
  3. 用这些测量的参数去设计最有可能的插口尺寸
  4. 将插口设计复制多个，并以0.001英寸的改变量改变尺寸（比如宽度减少0.002英寸、减少0.001英寸、增加0.001英寸、增加0.002英寸等）
  5. 切割和测试是否合适

Once you have a good dimension, create a template layer in Inkscape with your basic notch shapes. When adding a notch to your design, use the Edit->Clone option to create a linked copy of the notch. When faced with modifying your drawing for a new material width, update the dimensions of the notch in the template layer and watch those changes update throughout the document.

一旦你有个合适的尺寸,在Inkscape将你基本的插口形状.做一个模板层。当在你的设计里需要增加插口, 使用Edit->Clone 选项去复制一个带关联插口. 当你因为使用新材料而改变尺寸时, 去更新模板的尺寸，你会看到整个文档的尺寸都会变化

More About Using Clones In Inkscape

更多关于Inkscape的克隆功能

Inkscape is capable of creating "clones" of objects, which are somewhat similar to Adobe Illustrator's Symbols. When you edit the original, the changes are propagated to all of its clones. Clones can be transformed, but their nodes cannot be edited. Clones can themselves be cloned.

Inkscape有克隆对象的功能, 这有点像Adobe Illustrator的特征. 当你编辑原件时, 它会影响到所有的克隆体. 但他们的节点是无法编辑的. 它们可以自我克隆.

You can use the Edit > Tile clones command to create patterns and arrangements of clones. A clone can be painted if the original has unset fill or stroke. Inkscape's clones are not stored in a palette.

你可以选择Edit > Tile clones 命令去创建一个参数化和设计好的克隆体. 克隆体可以编辑加入原件的填充和线条还没有设置. Inkscape的克隆体不会存放在剪切板里.

How to Clone / Resize

如何克隆及调整大小

Other Press-Fit Resources

其它嵌合式设计资源

相关链接 http://boxmaker.rahulbotics.com/ http://www.slideshare.net/bereketnesh/press-fit-exercise http://makearchitecture.wordpress.com/people-2/jd-sassaman/asn2-laser-cutterpress-fit/ http://www.instructables.com/id/Press-fit-Construction-Kit/ http://cucfablab.org/book/press-fit-box http://unlimiteddesigncontest.org/en/product/magic-box-entirely-new http://www.adafruit.com/blog/2011/08/12/laser-cut-project-box-tutorial/ http://store.curiousinventor.com/blog/how-to-make-cheap-lasercut-custom-boxes-for-your-diy-electronics http://www.slideshare.net/AYSHESHIM/press-fit http://fablab.waag.org/archive/stand-camm-1-gx-24-vinyl-cutter http://www.fabhub.net/showthread.html?31-quot-Getting-Started-quot-projects-20-1-hour-projects-at-the-Fab-Lab http://www.ehow.com/how_7978816_press-fit-magnets.html http://mauimakers.com/wiki2/doku.html?id=laser_cutting

Creative Commons LicenseAll content © 2013 Anna Kaziunas France(except where otherwise noted). Some rights reserved.Licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License

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