On Wednesday 22 February 2017 04:50:20 Valerio Bellizzomi wrote:
> > Haveing a module processing data from a read above the actual port > > read inserts a one loop execution delay in processing that data, so > > unless you want a delay on purpose, the order is always the read at > > the top of the list, the data massaging in the middle, and the write > > of that data is always last in the addf order. The data twiddling > > can be a thousand lines below all this, but it will be executed in > > the order of the addf's. Delays in processing, then making use of > > that data affects the stability of the loop because the data is > > stale. Most noticeable when setting up the PID modules. > > Thanks Gene for this clarification about LinuxCNC internals You're most welcome. [...] > I'm not accustomed to inches, that should be 40 * 2.54 = 101.6 mm/min Wrong multiplier, an inch is 25.4 mm's, so 75 ipm=1905mm/minute, almost 2 meters a minute. With the right motor instead of this 1600 oz clunker I'm useing, I could at least double that. > with my current machine I can set a speed of up to 800mm/min (when > cutting wood) without any problem Thats about 31.5"/minute. None of my spindles can cut mahogany at more than 15"/minute, the spindle is way to slow, and then, since its generally 3/4 inches thick wood, I do it in 3 passes to full depth. I am fond of the Green and Green joint, a huge box joint whose fingers are somewhere between 22 and and 28mm's wide, for furniture, and make it on the G0704, including the assembly screw holes and the square pockets above those for the ebony buttons that hide the screws. I make those on the milling machine too. But the top speed on its spindle is around 2750 with the cheap bearings in the back gearing screaming for mercy. I've got to replace them with quality bearings. I don't often run it above 1500 in deference to those cheap bearings. Where on this ball of rock and water are you? Cheers Valerio Bellizzomi, Gene Heskett 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) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
