On Saturday, 12 March 2022 07:39:12 EST andy pugh wrote: > On Sat, 12 Mar 2022 at 03:44, gene heskett <[email protected]> wrote: > > The max radius the corners of that stick, as its turned, ought to be > > some figure plus the 26 starting point when the square has been > > turned 45 degrees, > > The diagonal of a square is just sqrt(2) x the edge. (this follows > from Pythagoras, but is just something I have picked up along the way. > As a CEE you might see a parallel with working out peak from RMS > voltage) Somewhat but its not a direct translation in practice.
And thats a CET. ;o) But I'll readily admit a hell of a lot in the CET field has changed since I sat for that in 1972, we were just barely into TTL logic then. Now we put half a billion transistors in the same chip real estate a 741 op-amp used then. The 6 core i5 in this machine now runs at 4.3 gigahertz on .773 volts when its busy. And does not speed up the idling at 733 rpm fan on its heat sink doing it. Normal speed when doing nothing but this email is under a gigahertz. Very power miserly. > So, if the radius to the flat is 26mm then the radius to the corner is > 36.8mm. (If you are working in radius then the little square with one > corner in the centre of the block and one on the block corner is what > you need to imagine) > > And, for a no-maths check, just draw it in cad and add some dimensions > :-) Except OpenSCAD, as neat and powerfull as it is, doesn't have a portable ruler... Designed to be dimensionless, its an accident of its genesis that a 1 in it is considered a mm in cura. cura could just as easily treat it as inches with an adjustment of its scale. OpenSCAD has been handier than the turn button on the outhouse door at a family reunion while designing this thing. I've even learned how to make an air manifold out of PETG that doesn't leak like a spaghetti strainer. Those teeny air compressors I bought 5 of, all running in parallel, are makeing more air than the mister needs, so I've got a couple MAP sensors coming that I should be able to cobble up another pwmgen module in hal, and modulate how fast they run. The mister doesn't need more than 2 or 3 psi, and I've got quite a bit more than that with he current lashup. Thats something a 24 bit MAP sensor, a PID, a pwmgen, one of those $6.50, 25 volt, 43 amp gizmo's from fleabay to modulate the pwmgen ought to be able to do. Might need a sum2 with one input gain set to -1 to take the sea level back out of the MAP output though. My main problem I haven't mentally solved yet, is getting a MS16 bits of the MAP's 24 bit output into linuxcnc as a 16 bit value. I need to see what Peter has in the way of something I can hang on a 7i76's SS bus. Until I get that solved, I'll just clone copy the gui controls I already use to manually adjust how wet the mister runs by pulseing that peristaltic pump. I've found an 8oz coke bottle of diluted koolmist, adequately cooling an 1/8" SC bit turning 15 grand while making the chuck wrenches for that spindle motors er32 chuck, can do a good job of cutting out the wrenches from a 1/2" thick alu plate, on about 2 oz of koolmist over 4 hours run time per wrench. Anyway, I got that code laid out and working according to the debug statements, now before I can go far enough to bring in some BZ motions, I've got to get up an a stepladder and retrieve the motor driver box, change out one combo 5/28 volt supply for a 42 volt, add a 12 volt, and change two of the 4 2m542's out for the 3 phase versions, and recalibrate the ZB scales. And we've about 8" of new snow n the front deck, still coming down pretty steady, of the 3" they forecast yesterday. And to top that off, I'm gimping around with a broken little toe on my right foot. Up on a ladder isn't too palatable an idea ATM. Progress on this project would be aided by have a sim copy of the sixty40 mill running on this bullseye machine. Any chance of that happening while this darned toe is healing? python version problems won't let it build on the pi when the pi is running bullseye, so it wouldn't surprise me a bit since the amd64 bullseye version of python3 is the same 3.9.2 raspios ships with bullseye. Take care and stay well everybody. Cheers, Gene Heskett. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
