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Mind you there are 1 or 2 out there who do enjoy the fiddly bits of this hobby that the rest of us hate !
Another 2 cents....With a dial indicator (mounted mine through a aluminum block that bolts to the cross slide with a t-nut, allows for really quick zeroing by moving the cross slide), centering up the 4 jaw takes me less than a minute. Once one axis is dialed in, the second one goes really quick. For offset eccentrics, I just center it, then offset one axis the amount needed. After a few times, the process becomes second nature. Its confusing which way to move which jaw the first couple times, gets easy quick.If making lots of parts with same offset, I could see making a jig with the offset built in like you guys have shown so no adjustment part to part is needed.
...Just the other day someone wanted me to make a few "flywheels" of different moment of inertia to demonstrate the change in current / acceleration of a DC motor, the resultant "trip back" through my college physics book, Sears and Zemansky, and the resultant integral math was just GREAT!!! :-)
Quote from: Lew Hartswick on April 20, 2017, 01:11:44 PM...Just the other day someone wanted me to make a few "flywheels" of different moment of inertia to demonstrate the change in current / acceleration of a DC motor, the resultant "trip back" through my college physics book, Sears and Zemansky, and the resultant integral math was just GREAT!!! :-)Next time, Lew, just ask me...http://www.homemadetools.net/forum/flywheel-inertia-analysis-48288#post68898
BUT it was such fun doing it with the old text from 1955 and even following the integration . I was "intuitively" suspicious of the text when I saw the 1/2 M (r2 sq + r1 sq) for the annular cylinder so had to go through the whole business to see why it was. For all those that just want an answer your link will be a great help. If they are concerned about the how/why it's a good thing to do the math . :-) I'll take you up on some of the other things in your fabulous collection of items though.
I can raise the stakes with off center turning/drilling with a 4 jaw SC chuck For my fuel injection components two 2mm shims move the piece of 10 mm square bar the required 1 mm offset in each direction
OK / Good joke from a mathematical point - but from physics it is rubbish, as there is no way a fly, flying 5mph can fly back and forth between trains traveling at 60mph .... or are you telling me that I missed the point completely Marv ...?... (not for the first time ....).
To be honest Marv, if you could have explained it to me and then I could interpolated into shop floor speak, we could have pulled it off. No emojis were harmed in this post .Cletus
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