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→How To & My Process
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Micro step can let the stepper slower and also quieter, but it is less accurate compared with a full step. With the easyDriver, you have options of 1/2, 1/4, 1/8 micro step. By default the easyDriver will drive a stepper with 1/8 micro step. And it can be altered by setting the MS1 and MS2 Pin High and Low. | Micro step can let the stepper slower and also quieter, but it is less accurate compared with a full step. With the easyDriver, you have options of 1/2, 1/4, 1/8 micro step. By default the easyDriver will drive a stepper with 1/8 micro step. And it can be altered by setting the MS1 and MS2 Pin High and Low. | ||
The [http://www.schmalzhaus.com/EasyDriver/ documentation] of easyDriver can be found and you can find the datasheet [[ File:EasyDriverA3967_datasheet_.pdf | here]]. | The [http://www.schmalzhaus.com/EasyDriver/ documentation] of easyDriver can be found and you can find the datasheet [[ File:EasyDriverA3967_datasheet_.pdf | here]]. | ||
====Step 4 Building the Gears==== | |||
Use the gears of the Lego parts. The detailed pictures showed below. | |||
The purpose of building up gears is to slow down the movement of laser. One can assemble | |||
the right gears to achieve a high gear ratio. The higher the ratio is, the better quality will be, | |||
especially when you want to achieve very precise result with a HD camera and the commercial | |||
version of David. | |||
[[File:laser_step4.png|600px|]] | |||
Use the yellow belt to connect the stepper motor with the main wheel which drives the gear set and attach the line laser to the wheel which is the “end” of the gear set at the other side. The function of the Lego frame is to fix the stepper motor and stabilize the whole set. | |||
Or you can build up with “professional” gears. | |||
[[File:laser_step5.png|600px|]] | |||
[[File:laser_step6.png|600px|]] | |||
The above picture is showing what I achieved with these gears, and I bought the initial material online. Here is the initial material (available in China only) : [http://trade.taobao.com/trade/detail/tradeSnap.htm?tradeID=122306748168870/ plastic gears], [http://item.taobao.com/item.htm?spm=1103QzuN.2-3EuJG.3-5v0*u5&id=12668819414&/ metal stick], [http://item.taobao.com/item.htm?id=12668843173/ plastic base bar], [http://item.taobao.com/item.htm?spm=1103QzuN.2-3EuJG.v-5uyAaS&id=12668879034/ plastic washer]. | |||
In the right picture of the “detailed look”, the gear stays at most left side is the last gear of the whole gears chain. | |||
Note: Since the material of plastic is quiet elastic, the Lego based scanner is kind of loose and the belt connecting the stepper with the wheel also brings some problem like sliding issues. It would be much better if you can build the “professional” one. However, you need to gain some experience with the mechanical tools and the “professional” gears are not so easy to find, unless you build your own with laser cutter or 3D printer. | |||
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