On Sunday 31 March 2019 11:07:51 TJoseph Powderly wrote: > hi gene > maybe redesign to drive past the switch > like you can brush a wall mounted light switch by swiping your hand > over the wall surface > rather than punching it :-) > ( try mounting so the direction of switch activation is 90 degress to > the joint motion ) > tomp > I hadn't thought of that idea, mainly because that would put the mechanism out in the breeze and subject to damage, or maybe snagging a hose etc as it moves. Mounted so as to detect the touch of the two parts as it comes to the end of travel is quite appetizing in addition to being "in out of the weather" so to speak. Mounting a 90 degree angled and flexible lever for z would either project forward or sideways, and sideways would cost me x travel too. I'll have to go stand and stare at it some more & see what I can imagine AND make. I've already done some of that, and keep throwing it away for one reason or another. The best idea seems to be to make a spring loaded button pusher with 1/4" of give in the spring, but that sticks out. On both moving and stationary parts. Sliding a ramp over the top of the button equals wear on the plastic button. And complicated by the inability to get at it to drill & tap screw holes without a huge teardown. So whatever is going to have to be set in position and superglued to the epoxy paint on everything. Imagination will be made to work overtime for sure. Changing switch style to roller lever is looking like a possibility. Put a short tab of sheet alu to stick out of the gap and hit the roller might work, and that would put the switch body flat on the stationary part. They can stand some overtravel by flexing the lever. I have enough of those for homes, but not for limits too. And with no Radio Shacks left, China is the nearest vendor. 6 weeks. Humm, for x home at left, peel my cable back out of the gantry cable chain early. Y home never gets to the gantry cable, only thru the new cambric coming down from the electronics shelf. Like I said, stand and stare at it. And let my imagination out without a chaperone...
Thanks TomP. > On Sun, Mar 31, 2019 at 9:03 PM Gene Heskett <ghesk...@shentel.net> wrote: > > Greetings everybody; > > > > I think I've got the coolant pump starting problem fixed. Ignore > > that faint knocking sound. > > > > Now I would like to use a teeny little pushbutton (6x6x2.5mm tall) > > between two solid parts of this machine for home and potentially as > > limit switches. > > > > However the amount of available overtravel after the switch has > > clicked is quite limited unless this switch is mounted on something > > crushable so that the getting stopped overtravel does not crush the > > switch like a Coors can. > > > > Is there a way to determine how much overtravel vs approach speeds > > is occuring? > > > > I ask because a wide open x or y move can do around 220 ipm on this > > machine, and that stopping distance is not an ignoreable distance > > when the switch only has maybe .010" of overtravel after its > > clicked. > > > > So I first would like to determine the maximum safe SEARCH_VEL I can > > use for homeing, then from that, be able to set MAX and MIN LIMITS > > far enough away from the crash stop to provide crash protection in > > the space between the LIMIT set in the ini file, or how much crush > > room I have to build into the switch mount? > > > > Also, in attempting to minimize this stopping distance, what or how > > can one detect a motor step slip if the ACCEL's are stopping the > > motor faster than it can stop? Hopefully without pounding a $90 dial > > into junk. > > > > Thanks all; > > > > 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> > > > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users 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> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
