It's time again to take a break from the Six Planet Genesis that I am currently working on to spend some time in the workshop teaching with my nephew as we work on our new small six planet orrery design. I really need to come up with a name for this new model. It is based on early 18th century orrery so perhaps I should start my search for a title their. I quite like Cassini, whom discovered four satellites of Saturn as well as many other astronomical discoveries based around the planets and moons featured on this orrery. In-fact as I write this I have decided to dedicate this orrery to the great astronomer Giovanni Domenico Cassini.
A cool Saturday was spent in the workshop cutting gear teeth into the blanks we turned the previous weekend. That's 2,308 teeth cut and Harry done really well not making one mistake, it's sometimes hard to believe that he is only 13. Whilst Harry cut teeth I turned the smaller gears that we did not manage to get round to the previous week.
The gear train for this orrery needs to be compact due to the base only being roughly 7" in diameter and the need to store the entire gear train within the base. We are using 40, 36, and 32 dp gears to achieve this using only 2 fixed pitches. I am proud to say that the error for the movements on this orrery is less than 0.01%.
Next weekend we begin assembly of the gear train. This will involve making the steel plates that house the gear train, cutting the planet tubes, and some turning. I will be back with an update.