We can move on to making the base (Fig 4). This is made from a piece of channel 45mm high x 95mm wide x 3.3mm thick x 525mm long. It already contained a few holes from an earlier application but these merely served to add lightness. The swinging arm of the saw is mounted on a vertical post bolted to the side of the channel. The post is made out of a piece of 185mm x 50mm x 8mm steel. Drill two 2mm holes at one end and clamp the post to the channel, use a square to make sure the post is true and vertical. Drill through the two holes with a 2mm drill then open out the holes in the post and the channel to 8mm. Cut a piece of 30mm x 4mm steel to 120mm in length and drill two 8 mm holes in one end to match the holes in the post. Drill a 4mm hole in the other end. This bolts on with the post to form the counter balance spring lower mounting. The pivot for the swinging arm I turned from a piece of brass hex but a nut and bolt with a shank would do. Drill a 10mm hole at the top of the post to accommodate the pivot.
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机译：我们可以继续制作底座（图4）。它是由一块45mm高x 95mm宽x 3.3mm厚x 525mm长的通道制成的。它已经包含了早期应用程序中的一些漏洞，但这些漏洞仅起到增加亮度的作用。锯的摆臂安装在用螺栓固定在通道侧面的垂直立柱上。立柱由一块185mm x 50mm x 8mm的钢制成。在一端钻两个2mm的孔，然后将立柱夹紧到通道上，并用一个正方形确保立柱正确且垂直。用2毫米钻头钻透两个孔，然后将立柱和通道中的孔打开到8毫米。将一块30mm x 4mm的钢材切成120mm的长度，并在一端钻两个8mm的孔，以匹配柱子上的孔。在另一端钻一个4mm的孔。该螺栓与立柱固定在一起，形成平衡弹簧下部安装。摆臂的枢轴我从一块黄铜六角形转了一下，但是带柄的螺母和螺栓可以。在立柱顶部钻一个10mm的孔，以容纳枢轴。
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