Construction of a wheel web

These are the first three radii of the web. Then a frame is constructed to attach the other radii to.

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After all the radii are completed the spider start to make the circular threads. At first non-sticky construction threads a made. The distance between the threads is so wide that the spider can span the width with her legs.

Finally the sticky thread is woven between the circulars thread. While attaching the sticky thread to the radii the construction thread is removed by the spider.
Then web is completed with non sticky radii and sticky circular threads and the spider can rest and sit in the center of the web with her head down.

I found those instructions on The construction of a wheel web.