On Saturday 07 March 2020 10:30:26 Peter C. Wallace wrote: > On Sat, 7 Mar 2020, Gene Heskett wrote: > > Date: Sat, 7 Mar 2020 07:06:41 -0500 > > From: Gene Heskett <ghesk...@shentel.net> > > Reply-To: EMC developers <emc-developers@lists.sourceforge.net> > > To: emc-developers@lists.sourceforge.net > > Subject: Re: [Emc-developers] nother Q for Peter C.W.
[...] > The encoder index is edge triggered but index is only used in one > direction (and at a constant speed) at the beginning of every peck > cycle so the index width is unimportant. Thats exactly what I wanted to hear, Peter. So any attempts to tighten up my peck tapped holes should begin with fine adjustments to the backlash setting so theres no pull or push on the tap when backing out. My method of setting that is probably pretty crude and is set for a tad over .001" atm. And I have had to dis the head to gain access to the z nuts locking bolts, which due to the design, are best described as tightened to about 1/16th of a turn past stretching them permanently. At some point I'll probably have to drill and tap for bigger bolts, that pair of 6mm's are definitely not quite up to the task IMNSHO. Shoulda been 8mm's, or a quad pattern of 6mm's. That however may have taken out so must cast as to break out the bottom of the socket in the back of the sled, which was not big enough for the foot of the nut bracket and I had to take the sled to the little hf mill and widen it vertically about 1/8" before it fit. The guy who sold me the kit offered to send me a nut bracket made out of thinner stock but I turned him down as my way was stronger. But it only took 2 weeks to work loose the first time as I hand tightened them the first time. I tightened them with a torque wrench so I could see them beginning to stretch the next time, and they seem to be holding ok now. Definitely a weak point in CNCing a G0704. The other fuss is loseing a fat inch of Y motion. That hurts, a lot! A few thou over 5.5" simply is not enough, the front motor mount interferes with fwd motion long before the spindle has reached the rear of the table. Both that motor mount and the screw could be an inch longer. > Peter Wallace > Mesa Electronics > > > > _______________________________________________ > Emc-developers mailing list > Emc-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-developers 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
