ctwo wrote: ↑Tue Apr 17, 2018 11:05 pm
It is not a poor compromise to seek additional information, which is all I posted. I said it was probably the worst way anyway, but I am sure it isn't. It worked more than once...at least to some magical degree that nobody can substantiate, like everything else.
Do not take my remarks personally. There are others who read these posts, some of whom may be seeking the proper way to accomplish a given task. To allow procedures to be discussed without pointing out the negative aspects is not serving them well. If there's a problem with an operation, every reader deserves to be told.
I didn't say it wouldn't work. What I said was that the end result would leave something to be desired. It's like oats. If you want nice, fresh oats, you must pay the price (do it correctly). If, however, you can be satisfied with oats that have been run through the horse once, then, yeah, clamping on the sides via a piece of angle iron restrains the jaws. It just doesn't load them correctly. That was my point.
but would like to try to understand some factors mentioned, such as "the jaws must deflect to the side in order to load the scroll". They need to do that anyway.
Unless you and I are not in agreement on what the side definition is, then you don't understand proper loading. You appear to be disregarding the fact that jaws are not a slide that moves strictly in and out. When you apply any side pressure, the jaw favors one side or the other, which won't be the load they see when the jaws are used as intended. This is very easily proven when machining soft jaws, as it's an error that is made by many, including myself. The end result is always an improvement over preexisting conditions--it's just not as good as it can be (concentricity suffers). Seems to me, if a guy is going to go out of his way to improve a chuck, it should be improved to the best possible condition. The jaws should be loaded radially, with no influence to either side. If that is not the case, the results will be a compromise (unless the jaws have **0** clearance, which I would expect to not be the case).
H