The lead screw has acme threads—great for transferring motion instead of fastening one thing to another. Another term is motion translation, as when we convert rotary motion (turning the screw) to linear motion (moving the platen down).
As you know if you've been attentive to this entire lesson, my acme screw came from an old automobile scissor jack. Its specs are 3/4" diameter and 6 threads per inch.
Learning opportunity
Look, it's a diagram. Don't we all love diagrams?
Connecting the lead screw to the bridge
The thoroughly cleaned (more or less) lead screw with the nut attached (right). This is the nut that you see in the picture below. See how it all comes together?
Bottom of bridge showing acme nut epoxied into a roughly hexagonal hole.
I use the term "roughly hexagonal" because I made that hole with a chisel and hammer. Epoxy addresses and forgives a multitude of sins.
Nothing lost in translation
Here, the lead screw is fastened to the bridge, and moves up or down as you turn it. See—rotary motion to linear motion. It's a miracle.
Next, the finished product
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