Re: [Emc-users] Z axis stepper gradually losing position

Gene, I hear what you are saying about old hands and working on boards. I am only pushing 60, but the company I work for regularly uses 0201 smt devices. Too damn small for these hands, even with the slickest working microscope out there. Just pumping the solder on and putting the thing in place

Re: [Emc-users] Z axis stepper gradually losing position (opto coupler speed)

On Sunday 13 December 2015 14:56:11 Karlsson & Wang wrote: > > ... > > I take it you do not have any opto-isolation in those 3 paths. That > > 700 ns is pushing an opto's ability to switch that fast. The BoB I > > used was all opto, and I was warned about its speed by someone > > (Steve

Re: [Emc-users] Z axis stepper gradually losing position

On Sunday 13 December 2015 14:39:19 Ben Potter wrote: > > > When going through my testing for this the first time I cranked > > > all 4 settings up to 10,000 - the problem still occurred. After I > > > tried inverting the output I slowly stepped them back down - for > > > my G540 I settled on

Re: [Emc-users] Z axis stepper gradually losing position

> And that would mean that direction is changed one step later. Which is fine, because the next direction change would also be done one step later and thus overall distance of travel still is the same. > How do I invert a step pin in HAL? I did not see anything in "stepgen" > section in hostmot2

Re: [Emc-users] Z axis stepper gradually losing position

On Sunday 13 December 2015 07:22:52 Ben Potter wrote: > > And that would mean that direction is changed one step later. Which > > is > > fine, because the next direction change would also be done one step > later and thus overall distance of travel still is the same. > > > How do I invert a step

Re: [Emc-users] Z axis stepper gradually losing position (opto coupler speed)

> ... > I take it you do not have any opto-isolation in those 3 paths. That 700 > ns is pushing an opto's ability to switch that fast. The BoB I used was > all opto, and I was warned about its speed by someone (Steve Stallings?) > on this list. > ... Yes opto couplers are not very fast, I

Re: [Emc-users] Z axis stepper gradually losing position

> > When going through my testing for this the first time I cranked all 4 > > settings up to 10,000 - the problem still occurred. After I tried > > inverting the output I slowly stepped them back down - for my G540 I > > settled on 700/700/2000/2000. > The Gecko 540 is not in the charts of our

Re: [Emc-users] Z axis stepper gradually losing position

I had X issues - observable on a long job of engraving. Job came out slightly not square! 5I25 to a Gecko G540 - as mentioned above, inverting the polarity of the signal(s) fixed it - I was pushing the Gecko G540 slightly too fast. Only one input of the XYZA showed the symptom. The machine has

Re: [Emc-users] Z axis stepper gradually losing position

anced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] Z axis stepper gradually losing position > > I had X issues - observable on a long job of engraving. Job came out > slightly not square! > > 5I25 to a Gecko G540 - as mentioned above, inver

Re: [Emc-users] Z axis stepper gradually losing position

2015-12-12 21:07 GMT+02:00 Peter C. Wallace : > If the step pulse is inverted you are likely to violate the direction hold > time And that would mean that direction is changed one step later. Which is fine, because the next direction change would also be done one step later and

Re: [Emc-users] Z axis stepper gradually losing position

Original Message- > From: Viesturs Lācis [mailto:viesturs.la...@gmail.com] > Sent: 11 December 2015 20:19 > To: Enhanced Machine Controller (EMC) > Subject: [Emc-users] Z axis stepper gradually losing position > > Hello! > > This is more like a hope that somebody (especially any f

Re: [Emc-users] Z axis stepper gradually losing position

On Friday 11 December 2015 15:19:14 Viesturs Lācis wrote: > Hello! > > This is more like a hope that somebody (especially any fellow > jewelers) might share their experience, where to look for source of > problem. Please feel free to suggest whatever possible ideas that I > already have not tried

Re: [Emc-users] Z axis stepper gradually losing position

] Z axis stepper gradually losing position Hello! This is more like a hope that somebody (especially any fellow jewelers) might share their experience, where to look for source of problem. Please feel free to suggest whatever possible ideas that I already have not tried out. I will try to provide

Re: [Emc-users] Z axis stepper gradually losing position

er (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] Z axis stepper gradually losing position > >> it takes something around 6000+ passes to complete whole circle. The >> problem is that the Z position in the last pass is approximately 0,5 >> mm

Re: [Emc-users] Z axis stepper gradually losing position

On 11 December 2015 at 20:19, Viesturs Lācis wrote: > Thanks in advance for any [almost] meaningful ideas! Is it plausible that the spindle is getting hot and expanding? It looks like far too much of an effect to be that, though. Measure tool protrusion at the start

Re: [Emc-users] Z axis stepper gradually losing position

On 11 December 2015 at 22:41, Marcus Bowman wrote: > The tiniest error in your (software) backlash settings accumulate If it does, that's a bug. It is more likely to be that the backlash comp moves are at max speed. If max speed is over-optimistic, then that

Re: [Emc-users] Z axis stepper gradually losing position

> it takes something around 6000+ passes to complete whole circle. The > problem is that the Z position in the last pass is approximately 0,5 > mm lower than in the first. Can you measure exact amount of Z axis lowering after program run (with block between table and tool - maybe its wax stock

Re: [Emc-users] Z axis stepper gradually losing position

et> Sent: Friday, December 11, 2015 4:26:55 PM Subject: Re: [Emc-users] Z axis stepper gradually losing position On Fri, 11 Dec 2015, Tomas Jarmolaitis wrote: > Date: Fri, 11 Dec 2015 23:17:59 +0200 > From: Tomas Jarmolaitis <tonar...@neonet.lt> > Reply-To: "

Re: [Emc-users] Z axis stepper gradually losing position

On 11 Dec 2015, at 20:19, Viesturs Lācis wrote: > Hello! > > This is more like a hope that somebody (especially any fellow > jewelers) might share their experience, where to look for source of > problem. Please feel free to suggest whatever possible ideas that I > already have not tried out. I

Re: [Emc-users] Z axis stepper gradually losing position

On 12/11/2015 2:03 PM, J. wrote: > First hunch: > Sloppyness in the z movement or in the spindle bearings. With lost steps as a > result. > > Because when you increase the 'load' the sloppyness is taken up by the back > pressure from the cutter. > > This problem has been the downfall of many

Re: [Emc-users] Z axis stepper gradually losing position

First hunch: Sloppyness in the z movement or in the spindle bearings. With lost steps as a result. Because when you increase the 'load' the sloppyness is taken up by the back pressure from the cutter. This problem has been the downfall of many stepper motor artists. A stepper might lag as

Re: [Emc-users] Z axis stepper gradually losing position

helman [mailto:g_ala...@yahoo.com] > Sent: December-11-15 3:09 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Z axis stepper gradually losing position > > > On 12/11/2015 2:03 PM, J. wrote: > > First hunch: > > Sloppyness in the z movement or in t

Re: [Emc-users] Z axis stepper gradually losing position

On Friday 11 December 2015 18:21:20 andy pugh wrote: > On 11 December 2015 at 22:41, Marcus Bowman > > wrote: > > The tiniest error in your (software) backlash settings accumulate > > If it does, that's a bug. > > It is more likely to be that the backlash

Re: [Emc-users] Z axis stepper gradually losing position

Have you tried lowering the acceleration rates in LinuxCNC. Sounds like you are losing pulses probably in both directions only sometimes and it take a long time for the errors to show up as an offset. Did they have issues like this with Mach3 ?Was the machine a lot slower with Mach3?

Re: [Emc-users] Z axis stepper gradually losing position

if the error is small , it may be the actual distance of a single step or less being 1.8 deg , and due to the ballscrew it does not allow the the measurement you want see if the step size equals the error , or less . changing the steps if your using a microstep driver , will sort it On 11

[Emc-users] Z axis stepper gradually losing position

Hello! This is more like a hope that somebody (especially any fellow jewelers) might share their experience, where to look for source of problem. Please feel free to suggest whatever possible ideas that I already have not tried out. I will try to provide as detailed description as I can (sorry,