The chances of seeing the bolts during the animation is slim, but by producing them it gives the group alternative directions to go with the animation.
The crank shaft uses a simple shape. For this I decided to produce the outline of the shaft using the line tool.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhs0tiGvsIpnSHq9OGOWC8IvMUnxrq6I4hzAEP8DbrA-YVW_DlFBEhsnmkYYYkmVldHlUhMPUdPFGTjT3wGRlcE3qIBjoqSk7TydXjsNSjsnMlduCxsA3l2Hj3O-38SHfITWIURU2G4bucG/s200/line+tool.jpg)
Then use the Extrude modifier to produce the 3 dimensional shape.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgKlGU364WK3WFJB04nPqQm5Db5vgCpTGtk0BWNyU4ZUtz7lhmJLtVZoNo36-unZLeoGUkubOUQBokWYcTEWww49tZ33ylONZiw94XEfwTCDV6wfpZHhbRGGfFUBwujzMlnDRHOFhj5pVe9/s200/line+extrude.jpg)
The problem with the extrude tool (as stated earlier) is that the object will be ridged. As I need a smooth object for the crank shaft I decided to use the cut tool (Poly) within editable poly to produce more edges to allow me to easily manipulate the edges into a smooth shape.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi3RkNsj1ZxsLO6hA0620LqwPxpSBbYrfCg9CPkSagOWoKEO0opiY3KtPB3C2hygV9FNFDGgFNFBM3EKZIbslAg9s3IMKwz23lMP7rPOe9PjS-m90-3KRZsktMxHRftCsl-B1iZk89rUV3T/s200/smooth+edges.jpg)
I added detail by extruding a section of the shaft (centre). Using a cylinder I was then able to use the boolean to bore the mounts for the bolts to fit.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhcTasXAw_JvwlBGp_fI8T3IzqTsQYD9tO0iSbYWqRZyrqneu_SVGdll8g3E6inMB3gH8sd_4ghB2DonvCi7Oxz3db37PvvPs9wEBpShGRYeoteGsuYBzSvYnqt53Fls4Dosn_V2O4AF1yv/s200/shaft.jpg)
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