Marble toy blocks part 2: Marble lifterI wanted a mechanical marble elevating device to go with the marble toy ramps. So I came up with another sort of marble pump.
At the left of the photo is the marble pump from my modular marble machine. This one works with a piston on a crankshaft (see here and here), but the cranking necessitates that pump to be screwed down.
My proof of concept lever based pump is in the middle, and the next prototype is to the right.
I thought my second version of the lever pump was about right, but it doesn't work out nicely with the 32 mm and 10.6 mm horizontal and vertical increments, so I built a third version.
After that, I drilled the main hole all the way through vertically.
I needed to cut a deep slot for the "ratchet" that keeps the column of marbles from falling back down after being pushed up. I'm cutting it with the table saw. I had to cut a bit deeper than in my drawing because the blade's edge makes a curved cut. I made several cuts side-by-side to make the slot wide enough.
You can also see the ratchet lever left of the marble.
I used a 5/16" router bit on my slot mortiser to cut this slot. I cut it in about 10 passes. Fortunately, making extra passes takes very little time with the slot mortiser.
I also cut a notch out on the side with the ratcheting lever. That way, I can keep the size of the top at 32 mm increments (for the blocks that stack on the pump), but still have room to hook a rubber band to the end of the ratcheting lever.
I also later also cut a notch in that piece I'm gluing in here to make a hook for the rubber band that pulls the ratcheting lever back.
I used my horizontal boring machine to drill all these holes. I hadn't really used that machine in two years, but when a lot of holes need to be drilled precisely, this machine comes in quite handy, especially because it's more rigid than a drill press.
The horizontal boring machine also came in handy for drilling the 45-degree holes. It's rigid enough that I can just drill into an angled surface without worry.
And lots and lots of testing, naturally!
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