Finding the center of mass. This is a quick explanation for finding the center of an object's mass when the object has a consistent thickness throughout one dimension. The push-stick can be thought of as two-dimensional in a sense, because the plywood is 3/8" no matter where we measure it. Because of this uniformity, z values will always be the same; thus, the center of mass is the average of all x and y values that the object occupies. The mass isn't really "evenly spread all around the point," so much as the point is the average location of the mass. Technically, the point is really inside of the wood, half-way through its thickness, but let's try not to get too lost in the details ;)
This trick cannot be used for every object in this way. Objects without constant values along a certain axis may have centers of mass that are located inside of the object, or even outside of it and off of it completely. Think of a horseshoe as it rotates through the air while spinning: Where would its center of mass be?
The push stick featured in this video is a handy little wooden device that is used to keep your hands safely away from a blade while using a table-saw. A print-out for making one can be found at John Heisz's website. Here is the related video:
I recommend the design.
Oh, almost forgot: I put some extra content on a second channel. The link to it is on my channel home/about page. It may not interest everyone, and I don't like the second channel trend either, but there is a reason, so cut us some slack: It is nice to stretch the legs of creative autonomy, and nasty comments have a tendency to stifle that. Lowered expectations allow me to take risks, and that is appealing. Well, check it out. You may find something good there. Uploading almost done... so, hope you like it, and let me know if you did!
Tags: Finding the center of mass, woodworking, carpentry, wood, diy, tips, tricks, router, table, saw, lathe, turning, miter, mitre, sander, making, make, homemade, engineering, geometry, math, planer, jigsaw, bandsaw, drill, press, scroll, jig, physics, center of mass, experiment, science, parabola, quadratic, push stick, shop, ASMR, Mathematics (Field Of Study), Do It Yourself (Hobby)