On Sunday 05 July 2009, Jeffrey Pease wrote: >Thanks for everyone's responses. I get a digest version of the mail >list responses, so I'll go ahead and reply to everybody's at one time. > > >> Robert: > >I haven't spent much time messing with halscope, but I'm not sure how >to best use it here given the intermittent nature of the problem. >Normally everything works fine, so I guess I'm not sure how I'd set a >trigger in halscope to capture when EMC actually messes up. I guess >maybe I could create a program that sends a whole bunch of very small >movements in a single direction for a single axis, and maybe trigger >if a movement ever occurs in the opposite direction?
I don't know if the halscope is capable of that sort of resolution since its sample rate at best is BASE_PERIOD. For this I think I would plug in a real scope, one that is 100% analog & 50+ mhz of bandwidth, dual trace. Mine is 100mhz, dual trace, the usual scope a broadcast engineer totes but mine is a Hitachi. That's what I did full time in a former life, now part time as I'm _almost_ the resident old fart here at 74. >I am using stepper motors. > > >> Terry: > >Apologies, I meant 40 inches per minute. :-) That in my experience, is pushing that technology unless you have some real high voltage drivers. 50+ volt stuff. >In other words, I am trying to get my machine to work reliably when a >G-code program uses F40 to set the feedrate. I never set more than F10 in something that gets complex, where a stall=wrecked part. Yes, my Z axis can move at 35 ipm, but only when everything is clean and freshly lubed. My X/Y have 20 tpi screws and 20 ipm is a bit beyond those. Half an hour into the job with swarf all over the place, nope. Its just insurance to slow down, & stay within the machines envelope even when its dirty and save the part. > >> Gene: > >I have gone away from using stepconfig for the fine tuning of this >machine since it always "undoes" some settings from the ini file that >I need. I have been tweaking the ini values directly. So have I for the most part, but then I was doing that before stepconfig, so its a shrug. :) >Do you know what ini file settings might account for the functionality >you describe? Looking in the manual, it seems like BASE_PERIOD might >apply, or maybe you are suggesting that I decrease my MAX_VELOCITY (or >MAX_ACCELERATION) for those axes? I recently found I could raise the MAX_VEL settings if I pulled back on the MAX_ACCEL settings. The hold timing is set someplace else I don't recall ATM cuz my xylotex setup isn't as fussy as some and it hasn't bit me (yet). >I don't see value that specifically affects the direction valid time, >but I definitely could be missing something... Someone will probably chime in here. >Thanks again for your help! I just hope it is that, help. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) The NRA is offering FREE Associate memberships to anyone who wants them. <https://www.nrahq.org/nrabonus/accept-membership.asp> The Arkansas legislature passed a law that states that the Arkansas River can rise no higher than to the Main Street bridge in Little Rock. ------------------------------------------------------------------------------ Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/blackberry _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
