On Friday 03 July 2015 00:03:58 Bruce Layne wrote: > On 07/02/2015 08:05 PM, Gene Heskett wrote: > > Generally its about .008" off the math at the end of an inch > > on the dial. > > Sometimes ball screws are sold as .2" per turn, but they're actually > 5mm, or .1" per turn and maybe they're 2.5mm. I think that should > result in close to .016" error per inch instead of .008". Any chance, > given the other issues you've had with the eBay vendor, that you might > have some class of imperial/metric problem similar to that? > > Either way, you shouldn't need to sneak up on it. You should be able > to move an inch, measure the error, and recalculate the scaling > factor...
I did that, went the wrong direction & had to start over. ;) I have yet to rerun pncconf, or the stepconf once I have a working file from either. ANYTHING else I do to it, is done with geany, directly on the .ini or .hal file. Way faster than wading thru either of those configurators when you have to enter fresh data every time. Either one really should read and load an existing file and fill in all the blanks. Neither does. I wish that was on someones wish list who could do something about it. Scanning thru the rest of these docs, I see that it wants setup and hold times of at least 5u-s on the dir line, and a minimum of 2.5u-s on the step line. I was pushing it a little faster with no readily apparent errors, at 4u-s on the dir line, and 2u-s on the step line. Because of that, I may scale my scale in the DM860 back to half whats its set for now, and cut the scale in the ini in half at the same time. That should get me the same speed at half the step frequency and get some speed back. Now, here's what I consider a bug, it squawks about maxvel being to high so it scales it back. But it doesn't move the jog slider, nor does it effect the displayed velocity in the backplots DRO. This is the latest 2.8.0-pre2 something or other. > although you might need to work backwards a bit to get the > right numbers to plug into the configuration wizard that calculates > the scaling factor from the various motor linkage parameters, in much > the same way that I work my sales tax forms backwards. Like > encryption's one way hash functions, the sales tax form is much easier > to calculate in one direction and much more complicated in the > direction the department of revenue wants me to work it, so I start > with the answer that I know and work backwards to supply the > supporting data in their little boxes. :-/ > > Despite the "issues" you've had, you're making great progress. I'm > envious. Good luck with it. If the weather co-operates, I have a small trailerload of trash from unpacking all this to take to the recycle place, and if I can find some perfboard, get started on the opto's for the spindle encoder. Slowed by needing to first figure out which end is the led and which end and what polarity the photocell is. All I know right now is that it takes around 50ma to run the led. I intend to get rigid tapping working on it, but likely NOT with this motor controller. I have one of Jon's servo drivers near my right elbow, but will need to cobble up a 2kw power supply for it before I can drive a tap. This motor doesn't have the best reputation from what I can read on the net. If it lasts till I get some blanket chests made, then smokes, its a shrug and will get replaced by something with some grunt. 2.0 to 3.5hp treadmill, whatever. Heck, I've gone and wasted my beauty sleep time again... Cheers Bruce, 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> ------------------------------------------------------------------------------ Don't Limit Your Business. Reach for the Cloud. GigeNET's Cloud Solutions provide you with the tools and support that you need to offload your IT needs and focus on growing your business. Configured For All Businesses. Start Your Cloud Today. https://www.gigenetcloud.com/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
