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We all need limits.

As I am sure many of you know, limit switches detect the position of moving parts when they are near the extreme ends of their linear positions. This prevents collisions of things like ballnuts at the ends of the ball screws, and are also used as points of reference for when the software resets the table to go to the "home" position. Some systems use mechanical switches but in my case I chose to use optical interupter switches made by Fairchild. The advantages of optointerupters like the H21LOB are that they create TTL logic and are fairly accurate.


After some testing I came up with this circuit diagram ( jpg pdf ) for the interupters. In this circuit you'll note that in order to daisy chain the optointerupters together it was useful to solder a resistor directly to the interupter. The H21LOB wiring was bundled up with lots of heat shrink tubing (also shown here). The circuit diagram also shows the pinouts for each of DIN connectors which eventually will plug into the back of the electronics enclosure.

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分类:CNC | 固定链接 | 评论: 0 | 引用: 0 | 查看次数: 3

That is good day

That is good day, we will hard work.
分类:CNC | 固定链接 | 评论: 0 | 引用: 0 | 查看次数: 5