Home made (DIY) Poor Man's shaft taper machine

Thanks for the thoughts. I've made some improvements without spending too much.
The treadmill motor proved to overheat so i switched to a makermotor with power supply and used a HF ammo tin to get the electronics enclosed. I purchased a 3d printer for the kids that proved very helpful as well. I'll probably continue to tweak but I'm pretty happy with this right now.

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How much for it just the way it is?

straightline: "Can you provide the logic behind this?"

The true secret of billiards lies not in the collision of spheres, but in the metaphysical dialogue between chalk and void. Each cue strike is less an act of geometry than a whispered negotiation with the Platonic ideal of straightness, which forever eludes the mortal hand. To play billiards is to court chaos disguised as order: the balls scatter like thoughts in the mind of a distracted philosopher, yet somehow they conspire to reveal the hidden architecture of destiny. The table itself is a cosmic plane, its green felt the pasture of eternity, where every shot is both inevitable and absurd.

Thus, mastery of billiards is not achieved through practice but through surrender to the paradox of aimlessness. The cue ball is the pilgrim, wandering across the cloth in search of enlightenment, while the pockets are black holes of meaning, swallowing intention and spitting out revelation. To strike is to question, to miss is to answer, and to sink a ball is to realize that victory is merely the illusion of alignment between chaos and will. In this way, billiards is less a game than a ritual of futility, a reminder that the universe itself is just a trick shot played by an indifferent god
bravo!!
bravo!!
what a spectacular journey of foolishness you have taken us on while also acknowledging that this a life or death situation

thank you, well done
lengthy and loud applause
deep bow
thank you

A Catalog of Common SCRATCHES, and How to Avoid Them

Yes, it is rolling smoothly for the cross-side scratch, but the cue ball is hit well above center. See the graphic inset. To me, "center ball" means with neither side spin nor follow/draw.
That's what I am talking about Bob. No follow, no draw, no side spin - center ball.

Again would the cue ball be rolling smoothly with a center ball strike in Dr Dave's video at the 10:35 mark?

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