Remember this device requires that you turn off your pump for at least a few seconds each time you want it to swap from one GB to the other.
I thought I'd use a ping pong ball because they might be easier for some people to find than the foam balls.
You clip the required sized saw to the disk attached to the central drill bit, and you are all set to cut a hole.
|I can now make PVC eggs|
The amount of water the ball displaces is important, because it makes the end with the ball in it lighter, so the device tips. The downside to using a ping pong ball, is that not enough water is displaced due to their size. I got around this by extending a gutter further than the outlet in each direction.
This makes the open end much heavier once it fills with water.
Previously this was achieved by the weight of water the larger float displaced. The smaller float would still work, but it would need to be manufactured with a little more accuracy, But with the addition of the gutter, you can be much more casual with your measurements.
So casual in fact that, like me, you can forget all about measuring.
It now looks like this. (BTW this is all 90mm PVC but could be scaled up or down to suit.
All up it's taken less than 30 minutes of actual work to make.
Most of my time is spent looking for things.
Current status is it rocks back and forth and successfully seals and triggers the tilt on both sides, and does so reliably for as long as it takes to fall to bits because nothing is glued, and there are no real pivot points. ( I think I'll just silicone on a pair of washers and pivot on screws or nails)
Next step is to find my silicone or glue gun.
[edit from the future - There is some additional material on sequencers. Readers might find this newer version in a post titled The Bullwinkle sequencer build of interest. It's a better design, and only costs around AU$15 to build with off the shelf PVC components]