Manufacturing method of gear device

1. A manufacturing method of a gear device which includes a first gear, a second gear for engaging with said first gear, and a supporting body having a first supporting section for rotatably supporting said first gear and a second supporting section for rotatably supporting said second gear, said method comprising:

a supporting process of supporting said first gear in said first supporting section;

an engaging process of engaging a jig gear which corresponds to said second gear with said first gear;

a measuring process of measuring a distance between the centers of said first gear and said jig gear by a measurement section;

a gear processing process of processing said second gear based on the distance between the centers measured by said measurement section; and

a supporting process of supporting said second gear in said second supporting section after releasing the engagement between said first gear and said jig gear.

2. The manufacturing method of a gear device according to claim 1 , wherein said jig gear has a cut off part to cut off a tooth body provided on one side thereof in a radial direction.

3. The manufacturing method of a gear device according to claim 2 , wherein said cut off part is provided on a side that the distance between the centers is long.

4. The manufacturing method of a gear device according to claim 1 , wherein said second gear is processed so that the measured distance between the centers becomes equal to a predetermined distance between the centers in said gear processing process.

5. The manufacturing method of a gear device according to claim 1 , wherein said processes are conducted in the same temperature environment.