On Tuesday 04 April 2017 06:33:33 Gregg Eshelman wrote: > You'd use a very low fill density, no fill if the pattern can be done > that way. Better slicers now have a variable density fill capability > along with variable layer height.Another benefit of 3D printing PLA > for single use casting patterns is they can be much closer to net > shape, which will reduce machining time a lot. An extra nifty thing > with the process is the same 3D model can be used for plaster coated > lost wax process, where the PLA is burned out the same way, and for > one part sand mold casting, same as the lost foam process that buries > molded pieces of styrofoam in the sand. > Well, one thing at a time, and I have 2 in the fire ATM. The countershaft in the sheldon spindle drive is awaiting bearings, while I see if I have to cut away some of the left bearing boss to allow the taperlock screws room to be removed and used as jack screws. Some preliminary checking seems to indicate I may have to "make" some room for the draw and jack screws.
Project two is going to need Matsche's help. As it may be that we need to slow that spi driver down just to get better control over the clock edges. I am still haveing joint errors even after the noise from the dials is nearly at the vanishing point. The clock signal from the pi seems to be slew rate limited, and so critical that I cannot boot linuxcnc with a 10x scope probe looking at the spi clock, its very close to a sine-squared wave, no real valid logic one when active high. IMO, any signal so critically timed as to be destroyed by a 10x scope probes presence, needs help in the form of a more squareish slew rate, which the pi apparently cannot do. So I may look around for a 3.3 volt Damn Fast buffer just for that gpio pin. And digikey doesn't seem to have anything but balanced line drivers. And this is a single ended circuit. Thanks Gregg. 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
