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All--Thanks for your views and your assistance in helping me understand these issues. Some 50 years ago I had the privilege of a bit of instruction in varieties of balk line billiards by a couple of seniors who themselves had started playing in the 1890's. As you are probably aware, balk line...

Sir--Thanks a lot for your reply; it really helped me to understand how the graphs were constructed and thus what they show. I did not realize that the time or position or frame points were separated by different amounts at the center of the graph than at the the other positions. And it was...

Sir--Spent a bunch of hard time on the video that you referred me to. Reminded me of that physics course that I couldn't handle years ago, but almost fun because it was pool. It was not simple to understand speed versus distance rather than time. And time went backwards in the video. Like the...

Sir--Thank you for the reference. In looking at the 3 graphs I am trying to understand exactly where the cue tip initially encounters the cue ball and where the two disencounter. Is that known? Nick

QUOTE=Patrick Johnson]All three of these statements are backwards. Good draw requires a cue that's moving fast. Acceleration (positive or negative) is irrelevant. The speed of the cue at loss of contact is irrelevant (in fact, it's about half what it was at impact). The speed of the cue at...

Sir, I will commit "pool-illegal" acts to explore and learn. BTW, this experiment is simply a limiting case of what slip-strokes are all about. Nick

Good draw requires an accelerating cue (stick). The speed at contact is irrelevant. The speed of the cue at loss of contact is the key issue. If you misunderstood my experiment, it was a "limiting case." Move the cue tip a millimeter away from the cue ball and do the same experiment. At contact...

"I doubt this" Eppur si muove. If you can't do this with your stroke, try this. Use just the shaft of your cue. Then hit the joint with your hand. It will draw. As to speed versus acceleration, try Koehler, p. 61. Nick

"The only thing the CB "cares" about is speed, offset, and elevation of the cue at impact." Interesting. I can place the tip of my cue on the cueball, then stroke forward, and get draw. Speed of cue at impact = 0. Draw = finite. The cue ball must be caring about something else. A century ago...

If possible, in addition to wearing a respirator, wet cutting, lathing, or filing is recommended. Water or oil, low speed to minimize airborne droplets, and must clean up the spent fluid.