by raimundo » 6 Apr 2009 7:35
round picks are not better than halfdiamond, they fill the keyway with pickhead that gets in the way more often than not. A half diamond pick will raise the pin just as high, and not impinge by raising adjacent pins if the picker knows what hes about. Good half diamond picks are not those barely and eggtooth picks that southord and others put on thier thick shafts. a good half diamond is steep on the front, undercut if necessary and steep on the backslope,
This type of half diamond is 'skeletonized' meaning all the sharp edges are rounded and the fat is removed in favor of greater mobility in the keyway.
You can put such a picktip under a bottom pin in a core you hold in your hand and see how it sets the pin whether it sets it with the upslope on the front of the pick or the height of the picktip, or on the backslope. And people who say that doing this will impinge on the next pin havent done this experiment enought to realize how small their objection is in the real world.
It is true that the ball picks will impinge on adjacent pins, but this can also be successful, because once again, if you put the pick in a core full of bottom pins and observe how it interacts, there is often a point along a slope that will set two pins at the same time. This can happen easily with a ball tip pick, it also happens with the half diamond when you chose to use it on two pins at once. But the objection to the balls is that they fill so much of the keyway, they cannot deal with deep cuts, and long pins, as they are prone to overlifting them.
Wake up and smell the Kafka!!!