Setting the Equation

requires at least 1 reference point.
If you look closely at the cam you will see there are 8 points marked.

There are 4 days of the year when the days are equal and there are 4, plus or minus extremes.
A way to set it up is to set the cam to one of the 4 equal days then fit the hands. Or do as I do, during making I
fit a pin to the equation hand pipe so the hand can only be placed in one position which is an equal day, I pick September the 1st as that is my birthday, then set the cam to Sept. 1st and it is done.
A little forthought can save a lot of frustration.

Pehaps surprisingly there are considerably more complicated and less efficient equation mechanisms in which the equation hand follows or leads the minute hand on its journey around the dial.
Most equation indicators have a hand and scale elsewhere on the dial.

A David Walter Double Pendulum Clock – Part 9, The Equation Wheel

By: DonCorson : August 24th, 2015-12:08

A David Walter Double Pendulum Clock – Part 9, The Equation Wheel Every week we are seeing more of David's work on his new double pendulum clock. The equation wheel is one of the more esoteric pieces of the movement. Its purpose it to drive a minute hand ...

Setting up the equation wheel

By: Ophiuchus : August 31st, 2015-18:59

Is it difficult for David to set up the equation wheel? With this style of equation mechanism, from my knowledge, the most complex, I know the positioning of the quadrants on the equation gear dictates how far ahead or behind the solar hand will be from t...

Setting the Equation

By: David Walter : September 4th, 2015-13:21

Ahh, makes sense

By: Ophiuchus : September 7th, 2015-07:52

So that little hole in the pipe coming off of the center of the equation cam meets one of 8 holes underneath drilled into the cam itself, around it's shaft, where you can quick insert a pin to lock the equation mechanism into one of the 8 equal or extreme...

Not quite how it is...

By: David Walter : September 7th, 2015-13:00

That hole on the upper end of the pipe is tapped to hold an annual date disc in position. The cam, year wheel, pipe and date disc once set when I make them are all screwed in position and can't be seperatly rotated. The equation hand is pegged so it too c...